Why do weber carbs spit back. Facts Discounted vacuum retard.

Why do weber carbs spit back emission stuff. Since been schooled that a true Weber, will have the brand name Weber in the actual casting, and not just intake valve adj could do this If they are still open on the compression stroke the wind will move back up through the carb. Using the Linkage Adjustment, balance carbs left-to-right. Frankly, I think 6 well sorted Individual Runner motorcycle carbs would be a hoot. Weber carb conversion - spit - high idle resolution. Start the engine and let it reach normal operating temperature. See if the Fuel Return and the Fuel supply line are reversed. ( a suggestion of jag lover member). Fuel injection was around back before the post-war incarnation of Triumph even existed, When I attempt to start I am successful 75% of the time, the rest 25% I get carb spit back, sometimes strong enough to unseat the carb from the cylinder head. other then that it runs very smooth and has lots of power. You can't buy new 'genuine' weber carbs as weber carbs were made in Italy. It bums me out to see a Lincoln Continental zoom past me. I would not go back to the single Holley that they replaced. I have checked and double check the valve clearance, timing, compression, new plugs and I have a single weber DFAV carb that sometimes spits fuel up out of the carb throat during acceleration. r. 10. The other suggestion is to pull the top off the carb and make sure the accelerator jets are tight. If necessary I guess I could repair them with solder, epoxy or even gasket sealer. When I try to start the car, I get an initial rush to ~ 1000 RPMs and then it struggles to do anything. Throttle response is quicker, car feels faster, starts right up hot or cold, and it doesn't suffer from í´m installing dellorto carbs, just like the webbers, and its been really fun until now, the installation you can do your self, its really simple as long as you have the correct linkage and your carbs are well tunned. Reply. Any one Page 1 of 2 - Spitting Back Through The Carb - posted in Problems, Questions and Technical: Morning! Iv got a little problem with my 1. I bought the book Weber Carburetors to start. Test the fuel pressure output with a fuel pressure gauge. I used Wayne's tuning methods with a Uni-Syn to adjust carbs. The Weber Q is no different. Have changed plugs, just in case, no difference - and HT leads. If you can. H. Anyone using split webers? They seem to be the carb of choice for historic stage rallying, had a look at three cars a couple of weeks back, some using Maniflow inlets and another with welded ie. My twin 40DCOEs will do 200 miles on a Spit mk3 tank at 50-60 cruising. ya, what he said, vaccuum leak, or it could be your carb is adjusted to lean. Throttle Balancing. Fuel pumps are no exception. Adjusting the webers is a thing you should now how to do. Now, after doing the best I could to get it in specs, it seems like it is too lean because sometimes when I try to start it, it "Pops" --backfires through the carb (Weber), especially when cold. Greg Weber carbs are period correct on a Pinto, not so much on a Spitfire. anyway here goes. Follow edited Apr 21, 2016 at 20:35. It currently has a Weber Carb and runs fantastic; however it failed emissions. I heard 3-3. so could it be something with my carb? i put it on back words once to see if it would suck the air in but nope it still blew it out backwords. Calgary, AB, Canada . I'm in the process of tuning the Weber DCOE's. 5 high lift rockers duplex adjustable timing chain lightened crank 123 distributor (set at 6) Weber 40 dcoe Jetted at:34mm chokes Main jet-115 Air Remember Water and Fuel do not mix. I took off the seat and opened up the air filter cap and took out the air filter and turned the bike back on to see and Then turn the screw back in slightly to achieve about a 20 rpm drop, or a slight drop in vacuum. On run back it developed spit and pops out of carbs under load and I cannot get rid of it. Spray carb cleaner around (not into the carb) the carb body with engine running, see if the ignition changes or engine studders, then you have an air leak somewhere. Could it be the idle jet id clogged again some how? It pushes the carb out of the intake hose after it spits back 4 or 5 times. For over 50 years, Weber has been engineering barbecues with remarkable cooking systems. The settings should be; speed screw no more than 1-1/2 turns in after contact and the mixture screw within a range of 1-3/4 to 2-1/4 turns out from seated. Do this on each side and don’t worry about the carbs matching up left-to-right. There are no markings If you are using DCO/SP carbs then start at one turn out. What is I'm having hell trying to get my '70 911T carbs tuned properly. Run a return line, either using a dual outlet filter (small nipple facing up) or add in 1) Too much camshaft overlap - these carbs do not like a lot of overlap. Of course, the truth is it really depends how good the driver is getting the power down through Lavant - in my case that probably explains why I am so off the pace - that AND the carbon phone. Sat in MOT station running for about 30 mins. Learn how to prevent spitting and what to do if a llama spits at you. The tank looks good and the fuel gauge is working fine now, not sure why the gauge was reading only halfway. Back; Welcome Club History Club Organisation Club Torque Cars. operating choke lever or turning out mixture screw more than Hi, I'm doing progress on putting back my 1980 Fiat back on the road. 5 is wher Do 8 Stack EFI or Weber Carbs Run Good On The Street? _____ Regards, Kevin Last edited by FUNFER2; 07-11 (about two years and 5000 miles ago) they have been great since. First thing to do is to get a copy of Passini's book 'Weber Carburettors" and understand how they work. I use a brass round inserted into the barrel. the air bypass screws are for equilizing the air volume in each side of the carb at idle and low rmp (while the carb is within the idle jet circut) This is very impoirtant in a center plenum car (single carb situation) or when running duals. Chewyboy Posts: 37 Joined: Thu Jul 03, 2014 9:23 pm Spit back standard carb. I can feather the pedal, but it will send a warm, beautiful ball of fire through the carb. I have an issue that I cant seem to resolve. I'm with Jac Mac. Pull the carbs and check the clearance between the throttle plates and the carb throat. You my need to go back to the . Any suggestions? In on my ongoing quest to plan out the refurb of my 76 B, I am trying to learn about the SU and Weber Carbs. I only saw one WAAAY back when. So what you do is pick a carb and measure the flow between the left and right barrel. This fact, of course, produced a 'monkey see, monkey do' mentality amongst some of We installed a new gas tank and fuel lines along with a Carter (4psi) fuel pump and Hastings fuel filter. I have done a true back to back comparo on a 383SBC with no other changes - this was a mild 400-ish hp street engine with 170cc intake runner and edelbrock heads, hyd roller cam, 9. Period. The basic problem is from 1,500 RPM to 3000 RPM it just spits and pops pretty badly back through the carbs. Thanks for the imfo guys. Off idle, lots of power, and smooth. Some people don’t like starter fluid but spraying some either into the carb will almost completely eliminate a fueling issue, (if you think piston rings are bad after running a compression test try pouring a little oil into the cylinder and see if it raises the compression a bi), this way you can somewhat I typically regulate my fuel pressure down to 1. All 8 throttle plates open at once, so it is very difficult to ease into throttle coming off of technical corners. After checking with a Hyundai dealership they said there is an issue with the neck of the gas tank being too small. So, Slammed1000 and I pulled and replaced the plugs to find that the cylinders had filled with fuel. Also, you always want to use a "real Weber" return spring on the carbs. The issue is that if I give it any more than about half or 3/4 pedal, the motor stutters slightly and if I gas it hard and quick it will backfire out of the carb. Posted by laverda1200 . On did everyone think about converting twin Weber carbs to individual throttle Barrels with internal injectors to keep original look for a historic car? Back in the early days of emissions reduction carbs had electrically controlled jets. In addition the engine do not appear to be smooth at low revs when I pull away, however it ticks over nicely. Beyond that you are in the idle jetting. Install bigger jets if you have them, but also try adjusting the idle mixture screws. Thanks in anticipation. Fuel contamination: dirty or deteriorating lines, dirty tank, or WATER (filters do NOTHING for this) will cause problems in the carbs. On full throttle, the carb is pulling from all those jets. Jets are fine Looks just like my old Solex carb, which I thought was a Weber too, as it had stickers on it that said Weber. Most horror stories you hear about dual Webers come from people who have no clue how to tune or syncronize them. Topic List Forum List Newer Older Start New Topic. I noticed that when I stopped the engine one of the throats on one carb kept flooding like HELL for at least 1 WHOLE! minute through the feeding holes on the base near the butterfly! What causes the excessive spit back and can I do anything about that rather than drip fuel out through the original fitting. The carb is a Walbro WT 194. Re: Weber carb conversion - spit - high idle resolution #18. Dual Weber 40 IDF's with cam style pump. This is occasionally accompanied by kicker kick back. Carburetors: never been abble to set them properly. Initial idle set screw adjustment: On carbs with a two digit suffix, GENTLY close the mixture screws till they just seat and back out ¾ turn: on carbs with a three digit suffix, back out 2 ½ turns. Some one told me it could be a timimg problem is there a way to set the timimg with out it running? the guy i bought the motor from says it run 38* fixed timing. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright If it's leaking out of the back throat of each carb, your fuel level's getting too high somehow. Hello Jam, The carbs only pop now and again. Holly boys on the other hand do not have to as much. The worst aspect of running weber carbs is the fact that you can't run a progressive linkage. Weber designed the IDA for all out racing. answered Apr 21, 2016 at 20:06. I am not looking forward to switch them back. Set the float height and drop to Weber specs, then advance to no less than 16 BTDC at idle. I checked timing and plugs and carbs all ok. If the fuel pressure exceeds 3. A progressive may or may not repeat all of those in the secondary. I do know weber carbs,, so I took it off , cleaned it and it starts runs and works well, with the exception of start off My buddy has a big bear 400 that is spitting back through the carb at idle and just above idle. I have a 280zx electronic distributor, new plugs/wires. My Stihl 026 is spitting gas out of the carb. The first Weber kits probably appeared in the 80's or 90's. It just seems sooooo sluggish when I'm starting from a stop. 5 riley rma. The “Similar” carburetors are easily distinguished from the European Weber by several characteristics: • The Genuine European Weber’s have the trademark "W" stamped into the carburetor and are clearly marked with its origin "Made in Spain". Slowly increase revs and see if engine speed increases without spit back 11. Am I right in saying that this could mean its running Sometimes when I ride I hear a coughing backfiring noise but it’s not coming from the exhaust it’s more in the carburetor. Post by SMOKE GREY » Tue Apr 05, 2016 8:54 am. A stock low compression engine would be very difficult if not impossible to tune with a DCOE. I am such a child. Try removing the air mixture screws and blowing out the passageways. Then readjust the idle speed set screw and move to the next screw/carb. I am not trying to cause problems. He suggested the Weber carbs are a true “bolt-on” package that, within hours, can visually transform any ho-hum utilitarian powerplant into an engine that looks like it belongs in a race Front-to-Back Balancing. One of the primary causes of an engine backfiring through the carburetor is improper ignition timing. KnightEngines Guru Posts: 2754 Joined: Sat Jan 10, 2009 1:51 am I would love to see a back-back dyno or track comparison of various carb options. Many people are confused about what these are for. I would like to ask anyone who has installed weber DCOE 45s 152s whether they are experienceing any low Weber Carb Conversion, 72 Spit. That made me wonder on earth why I didn't do this eariler. Your carb also runs best on an engine with 175 psi or higher cranking compression. TwinTurbo January 29, 2010, 7:22pm 8 Weber carbs have a number of vary small passageways in them. Then if these are not in the correct range to adjust the primary idle jet. 5 c. In July, I tried to crank it over with no success. a. To be honest I only fitted the carbs about 3 days ago and although I've had a few runs in the car I haven't really had the chance to They are widely known to do just the opposite (some Weber downdraft carbs are more economy-oriented). This video is the final in the series about the Weber Power Plate which was a performance enhancement that came out in the 80's for Holley carbs. I contacted Terry Lippincott (Weber/Jag racing specialist). The timing is set at 4 degrees before TDC. Ran perfectly for about 6miles. The single, downdraft, Weber DGV carb is and expedient conversion but not a good conversion. I had bought a manifold years back from a buddy who had it shipped in from Japan for me for $100. hey everybody ive got an issue with my weber carb and im wondering if anyone else has this issue, sometimes when i go to hit the gas pedal and open it up the carb makes a big "pop", almost like a back fire. Joined: Mar 17, 2010 When a motor experiences a “Spit-back” through the carb caused by an intake valve that is out of adjustment, it is possible, and likely, Problem is that, when starting from cold if you just slowly open the throttle from the stop to about 1/8ththe revs drop and it spits back slightly through carb as though it is week just off the stop. • Set the idle mixture screws as lean as you can until the carbs spit back, or the engine stumbles when starting out on a drive with a warm engine. John--Las Vegas. One reason is the DCOE's accelerator pump, but you can play around with setting that up for a little improvement in fuel economy. A weber has essentially, an idle circuit, a progression circuit, a pump jet, and main jet. May have exposed the progression ports on the 1-2 carb. Quite rare and Ford advertised 343 HP with a 289. Air screw is about 1 1/4 out. So a pump could have a pressure at NO flow that is high, but when relieved, even a little bit, may go significantly lower. By using the barbecue with the lid closed you can achieve a unique barbecued flavour you can’t get any other way. Unless a Weber carb is really filthy inside, you're probably best off to simply clean off each of the removable components and carefully blow out the passageways to make sure they are clear. I just removed the triple weber setup that I had installed and put my stock SU's back on. Simply put that build up will cause it to overflow and spit back out. When your intake spits back at the carb, The white mist spit back is often indicative of a throttle plate (speed screw) being opened too far. I've went through the carbs so many times it might as well be engraved in the back of my mind. Average drivers are quicker with a single holley carb with the same Here’s why you shouldn’t spit out any mucus when you’re ill For some lamebrain reason I thought I should time it. Balance carbs front-to-back using the Idle Sync Screws. I also checked fuel level by removing main jet Had been running fine - really started when coming out of hibernation. The Weber Q cooking system has been specifically designed to work with the lid closed. If the issue goes away just after 2000rpm, then it's certainly the 2000 105 with twin Weber’s. I bought a 3 weber carb conversion from Classic Jaguar quite a while back and am now trying to get them to work. It has electronic ignition. I asssume that this is an air leak somewhere but cant seem to find it. I have a 1972 240z. It's very common for only one carb of two to leak. The carbs have been balanced and the Idle is at 800± RPM. Weber carbs, made by Empi. Facts Discounted vacuum retard. There is also a hesitation and stumble from idle and I sometimes need to Can anyone suggest the most likely cause of "spitting back" through the webbers on my two litre nord engine. There were both ZS and SUs with some weird features that generally aren't good for performance, such as an anti-runon valve in the butterfly plate. Legacy Forum Import; GT6; Spitfire; By Peter McEvedy June 5, 2012 in Engine. The issues with the carb are Doesn't idle when warmed up (works fine cold). I had to remove them due to the cost of gas. In my city only are 3 of them. I recently replaced the the stock carbs with Weber downdraft and I cannot prevent the car from spitting back through the carb. G. Improve this answer. Sign in to That's the website I was using plus the weber page on setting ICT carbs. The cylinder second to next to the firewall (3) does not respond to idle screw adjustments, and cylinders 1, 4 and 2 do. I have some assorted plastic floats that seem like they would However, it is still good to know why backfires happen and what to do if you want to fix the problem. According to the markings before adjustments, it semed a bit retarded. weber < holly I am using a holly for my rebuild. Dirty Carburetor Components: A dirty carburetor can lead to gas spitting as it obstructs the fuel flow, causing irregular fuel delivery. www. Abingdon type inlets done by SMMC which looked very good. 25 and she ran with no issues what so ever. "Ignition timing ok" - book settings will NEVER run well with that carb. now this carb conversion,,,,well a little off , but I a strong background , as I am a retired Import Car Tech. As I have a electronic ignition I had the timing checked at a local shop with a lift. Quote; Link to comment. Just wanted to make sure my tuning of the carbs was ok and it sounds like it is. I know one thing everyone did agree upon wa 1500 MG midget, weber 32/36 dgv tuning question I understand the process of tuning for best lean operation with the idle mixture screw and idle speed screw. In the Replica market its 90% the look factor that sells, eg; Halibrands-Webers-180° exhausts etc. I bought a fuel pressure gauge becuase I was curious what the current pressure was (new fuel pump too) and when running it registers at about 7. any ideas there? other problems are very rough cold starting (normally seems to be running on only for cylinders) Two things besides floats (though I can't figure why carbs sent to specialists would come back with incorrect float settings) will affect you. Please help, I can't understand why ? I checked the intake manifold for leaks by spraying WD40 while running and no smoke. Ive been reading already. Top. As for the weber 32/36 I had, it sucked. I have however encountered one major problem after having run the car to a meeting and back Weber carb have to do nothing with this, even with current holley 5220 (doing horrible 13 mpg thing and few issues), still would snap something in the transmission. Everyday I had to tweak it. Do you have suggestions as to a set of jet packs I should start out on or some sort of guide to help me start on tuning carbs for the l20b. Try to find a balance where the left and right linkage arms are the same length (if you have separate arms). But an EFI system would probably leave them all behind, if for no SPIT WEBER CARBS/MANIFOLDS. Happens at all speeds BUT the one consistent thing is that it's always at zero to just open partial throttle. Weber 40 Dcoe Leakage - posted in Problems, Questions and Technical: Hi guys I have just put my weber carb back on my engine. 4 and 6 is right for the valves, leave them at that, but I would double check. Weber Carb Conversion, 72 Spit #1. They work by allowing some air to bypass the butterfly valve so that you can get the flow matched between the two barrels of a carb. As a novice to these engines and the Webber carbs has anyone any idea why this shouid be so. They only need opening a small amount and will act to stop the screws becoming loosel Tony[/quote] When you do this step be sure to rest the shaft on something solid. Was this post helpful or interesting? Yes No Thank. The floats are brass. Dec 10, 2015. The exhaust does pop and bang a bit on the over-run. Plus we want to see what the Weber will do when he puts it to the test. The 911 weber carb concept is fairly new to me. Glenn, Dec 10, 2015 #3. You may have to fabricate the intake risers, but used Weber IDFs are available cheap, I found a used 40IDF-XE, in excellent shape, for $115, just check them out for wear before you invest much time or parts. IIRC, When you are syncing the carbs. When I accelerate I find it spits back though the carburetor. There’s really no reason not to spit, but if you keep your mouth completely still and put the pouch in and leave it dry, you will only have to spit once or twice, and the flavor/tingle will stay in the pouch. Everyday! What a nightmare!:cursin: I have been having continuous problems with my Spitfire 1500 TC SU Carbs and eventually have given up and fitted a Weber 32/36 DGV with a pierce manifold. Marell dizzy with pertronix. I kind of grasp how that works and why it would spit magnificent fire balls out the pipes, I'm fairly sure that that engine tuning strategy is not in wide spread use these days, but I've seen lots of race cars still spitting fire balls Now back off the idle speed screw and then slowly make contact with the carb arm and give it ½ turn to just open the butterflies. Which should have been a recall. Timing Issues Ignition Timing. good luck. If you do that you might want to replace the gasket between the carb halves, as that could also be a source of gas leaking onto the butterfly. could i have mested something up in the carb cause it wasnt getting gas then i found a clog in carb so i un cloged it and then put back to gether and then started blowing the gas out backwords. I can't remember what grind the web cams are but they are a good street cam grind and the car has or had 180 rwhp at The employment of the Weber DCOE 45 carburetor on street MGBs came about as a result of their use on the factory team’s track race cars. 60mm idle jet. 6. This is why I'm wondering if something is wrong. Common Reasons For Carburetor Spitting Gas. Although this is not a technical forum, you people sure seem to have a whole lot technical knowledge Yes, I do crave for more information, By the way, look at the bottom of the Weber carb's filter attachment. I am getting a small backfire out of the front carb during idle and under acceleration over 5000 rpm. It starts with me flat on my back after jacking. Paul. I have had an Elan Plus 2 for the last copuple of months and as time has gone on I keep hearing a kind of Zuuup (spitting noise) fron the engine. You can't buy new weber carb made by weber for these VW's as they no longer make them. Legacy Forum Import; Herald; Vitesse; By Curtis1360Barry October 13, 2012 in Engine. The most common cause for a two-stroke backfire is because of rapid You can have new bushings put into the housing but doubt it is worth it if the leaking is that little. A DCOE can't leak fuel sitting if the float level's correct. Being that all the emissions control from the stock carb have been disconnected this is understandable. Newly rebuilt. Hey everyone, Well, as some of you know, I inherited a '73 911T from my Dad. So we went to jetting. These screws are used only to adjust the barrels on each carb to each other. so that the back of each inlet valve sees a tube of similar bore all the way out to the filter, no plenum no cross talk with other cylinders. People are going around me in traffic. Through, I'm throughly impressed with weber. Another thing that happens is from 1000 to 3000 if i get on the gas lightly, it seems to spit back through the carbs. . CB Performance sells a good Weber book by Bob Tomlinson. Posted by TheZster . Air box Spitting back through the carbs is normally a sign of idle jets mal - adjusted, or air getting sucked in somewhere. Proform (Holley HP clone) 750DP carb on edlelbrock performer intake vs quad 47mm OER (Webber DCOE clone) on a moon cross-ram. I have a NEW Amal 626, adjusted for max. An old Ford option was a 6 carb manifold with Webers. 1 » Thu May 05, 2016 5:53 pm . Back; 2000 About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright I wasn't even going to post because I really don't care which carb anyone uses. Both 3) It has to be something simple like idle mix issue, crud in the idle circuit ( if both 5 and 6 spit, a real possibility), or air leaks somewhere. To operate correctly, a Weber carb needs to be super clean. On the journey back it was spitting out the carbs and now I cannot get rid of the spitting out of all barrels after about 2000 rpm I figured it is a lean condition so I cleaned out bowls, filters, checked timing etc It idles like a watch and starts perfectly So I check fuel pressure which I have never had to do before, and find it is about 1psi. We we cleaned the carb including the jets, adjusted the air screw from 2 and a half out to 3 turns out and nothing changed. They say are to complicated. Actually no carb does but since these are usually installed as Individual runner carbs - they are more susceptable to mixture control problems when you use them on an engine with more than 114 degrees lobe center on the street. The big problem is getting it set up I run dual IDF's on all 3 of my street engines. I played with the throttle adjustment screws, the mixture screws and the ignition timing with no results (no changes). Terry and I spoke for a while I let him know all of the work I had completed. I explained that the carbs continued to pop and spit. But if it was a friend, I'd urge them to use the motorcraft. I can just barely get it fired by holding the throttle open. Backfiring Through Weber Carb - Now At Low Revs As Well - posted in Problems, Questions and Technical: Previously, my racer with a 296 kent cam (with the 220lbs double valve springs that comes as part fo the kit) backfired through the weber carb at high revs, but only one quick one at a time, I can feel a half a second of power loss, keep my foot down and the car Edelbrock carbs are actually Weber bssed. 5 psi, install a fuel pressure regulator. One of the twin floats from my Weber 32/36 DGV5A appears to have some gas in it. There may be a port there, where the crankcase ventilation hose would be connected. I have checked for air leaks but am beginning to suspect I have a series 2 with Weber’s that spits back thru the carbs and on occasion will backfire thru a venturi. 6,017 4 4 gold badges 27 27 silver badges 55 55 bronze badges. Now I know its not a mini but an engine is an engine and the basics are all the same which is why I posted here. my carter afb 600 on my 304, will back fire like crazy through the carb, if i have it to lean. I have a series 2 with Weber’s that spits back thru the carbs and on occasion will backfire thru a venturi. As I have a electronic ignition I had the timing checked at a local shop This makes sense as fuel gets to rear carb last, so I guess this will see the effects of too higher pressure more than the front carb. Carbs are often set up to Popping/spitting back through the carbs usually means the idle jets and circuit are too lean. 1. We have run as tight as 105 lobe separation on race winning engines. Engine spec: 1380 Omega pistons evolution 001 cam (from mini sport) 1. Do not tighten to hard but remember to splay open the ends of the screws with gentle pressure as they can be easily broken off. This turns out to be a great bit of kit and the engine now runs perfectly and idles superbly. This scheme allows that crankcase gas/oil to be deposited into the Ok first of all Im not a weber guru, I just run them. My 1977 B is fitted with the Weber 2 barrel carb that is so common in pictures of these cars. The sidedraft Weber DCOE, dual-throat carb can offer performance improvement. We usually refer to an exhaust backfire as a "backfire", and backfiring through Weber took carbs back and it's still not right after finding a problem. Alternatively a pair of SU HS2s from a Spit Mk3 or 4 will go on fairly easily. 0 psi. Regular maintenance and cleaning can prevent this issue. I'm just getting these carbs set up and was doing the "best lean idle procedure" and when I turn the motor off the rear barrel (rear of car) of each carb fills with fuel and goes "gurgle / hiss". I also setted up the floats on both carbs within specs in order to prevent flooding. On a thru bore SU carb, the bridge is machined out of the carb throat to increase the CFM of the carb, but it pretty much makes it un streetable, so life with those carbs, which were menat for race only condition is going to be tough to live with oin the street. 2 liter rebuilt motor with 9 to 1 compression a little more aggressive However, when they are on, oh boy, do they ever pull! It does make it hard to cruise at 55 down the highway when you are pretty much having to either accelerate or decelerate - there's no giving it half-throttle and maintaining speed without the popping, and anyway, half throttle doesn't really do much. That said, I looked up to see what I could find in my Weber tuning manuals. that come along with consuming the food. Now a DCOE carb is another story. Like shadowmxd, I don't regret this conversion and I encourage anyone wanting more power to look into the Weber IDF downdraft carbs for 140/4 carb head. The Strombergs are NOT inherently bad carbs, the insult was putting only one of them on the Spitfire. Must of the people I know do all their own tuneup work. They are spitting a lot, especially one. Yesterday as I heated up the engine in order to do some balancing and see if I could jet it a little better. com Weber spitting and popping. I believe they were only dealer installed and really looked wicked. The car hasn't been driven or started for some time. Share. Re: Weber carb conversion - spit - high idle resolution #5. Possible checks. All you have to do is see how many thread there are on Weber carbs running poorly. Weber Carbs and Fuel Back Pressure. Incorrect Float Adjustment: If the float is set too high, it can lead to excess fuel being held in the carburetor, resulting in gas spitting. Try opening throttle fairly quickly and see if again engine speeds up without issue All being well the problem should be resolved, but be aware that spitting back has resulted in a number of fires in the past so always have an extinguisher to hand. They are prhaps carrying much of the idle function for the car. Rich or Lean The idle jets do provide fuel right through the operating range of the carb but the hesitation when the pedal is floored is more likely to be the mixture either leaning out too much due to too small an accelerator pump shot - usually accompanied by "spitting back" through the carb OR being too rich - which is accompanied by a spurt of black, sooty smoke It can tighten up the throat. For those of you already familiar with Weber’s DCOE know that one could easily spend a week or so trying to get them perfect, only settling for “hell, that’s close enough!” With all do respect Hi, CV carb has started to spit back. the truth is that i have not started my engine, its been an almost 8 yrs project and i´m only two or one week away from hearing the original engine to my car for the Find out if you have 44s or 40s, your weber book should aid in that. This is for my xk150 which I installed a 1985 4. Like when you overtake someone and then back off the throttle to settle down the speed; the moment I twist to reopen the throttle she backfires/spits out the carb. Is there any benefit to putting the stock The old parts were definitely holding me back, but now with this replacement kit, my machine is running better than ever. Backfiring from the carb is normally a sign of a lean mixture, but it I recently replaced the the stock carbs with Weber downdraft and I cannot prevent the car from spitting back through the carb. She will run fine for a while, then just when you think you nailed it, boom 1 and 3 out of service. e you need 3 DCOE 40 or 45s, 1 carb barrel per cylinder. # 6 is at 125 psi. The engine actually idles relatively well, with only the occasional "spit". In this fi Hey guys- I just put in a Weber 32/36 manual choke and I read in a few posts where it is suggested that you put on a fuel regulator. The REAL Weber carbs are VERY good and it takes a bit of tuning to get them right. Not the highest. The compression was about 110 in all 3 cylinders, the bottom carburetor spit the exact same when it was put where the top carburetor goes. My car has triple weber carbs on it. In another post last week, I sensed this is controversial. This may mean adjusting the idle speed as the engine warms up. I have checked the intake manifolds and redone the gaskets twice, I have changed aircleaners, carbs etc but it still does the same thing. My machinist told me that all the weber boys are always having to mess with their carbs. Al, why in your 58mm model do you not make a TB that is similar in appearance to a 58mm Weber, or in the 48mm version the same as an IDA. They are genuine because the Weber company allows other people (not just Empi) to manufacture stuff they used to make, under license. I am trying to learn. I found another problem I know that there have been several discussions on this forum in the past regarding the topic of weber installation. by Warkton Tornado No. cbperformance. As everybody on this Forum will have Why does my engine spit or backfire? When you hear a backfire, you need to determine whether it is backfiring out the exhaust or back up through the carb. i. This will be my first carb I will be tuning. So, a swap of carb models might do a lot to improve performance. Doing it the way you have. laverda1200 Paul LeClair. I'm not talking a little, its a lot of fuel being sprayed in the back, and I'm not sure why. Weber carbs. durangotang Member 2022 Sponsor Not Western CO. Then open the idle mixture screws to get even rpm drop. They look new, so it maybe just a pin hole leak. b. One of the carbs spit back. • Turn out the screws minimally until the engine is as lean as you can go, but only spits rarely, and drives ok up to about 1500RPM. With a flashlight shining in the carb, you can adjust the link balance screw and the idle screw to EXACTLY open the butterflys together. 5 to 2. I just got my ignition hooked up when i started my car it wont stay running but when it is it is spitting fuel out of the top of the carb. Hyundai fixed the problem by making a bigger neck to the gas tank. You adjust the snail to match the lowest reading carb. My SU carbs needed rebuilt with new side throttle bearings and for the money, I have spent less getting my SKs up and going than I would have to had gotten the SU's redone. Needless to say it's running a little rich. How do I fix this? I am also having the same issue. A powerful pump can make both do it. make sure you have the fuel flow to the carbs and to the bowls Depending on how the carbs are mounted 11 * max to the horizontal and under hard accel the front barrels will go lean and the rear rich if the carbs go lean Those are SFD, AKA Bob Weber of Texas thru bore race carbs, Bob is a smart guy, built fast racing stuff. • The only markings on some of the "Similar" carbs are a sticker. You do not want to replace them with stronger springs as the stronger and heavier springs will wear the cross shafts and there is not a fix for Webers with worn cross shafts. (the back throat is lower than the front, in a 2002, just sitting) All the above comments on as to why. I want to know what is the problem with this setup. Was this to improve performance and Ok, let me get things clear. Page 12. Nobody was putting Weber DGV carbs on Spitfires back in the day. . My CJ is your Wranglers Daddy Fitted a new hi-flow air filter and iridium plugs. MooseLucifer. I had this same issue with dual 40 idf's on my Bug and took it tothe local VW race engine builder, $360 later got it back with a A 2 carb set up would involve a plenum and weber's were not designed for that. The carbs I got in a trade of a set of Su's along with a manifold. I had all 3 carbs sent to Steve’s Carbs in North Jersey (he is sensational) the carbs were ultra Sound cleaned and completely I know this subject has been covered and I tried to go back and look through many post but did not find the exact answer I was looking for. Every If I still have issues with hesitation, bucking and a spit once and a while, I think I will remove the carbs and make sure the throttle plates are fully closing and fully covering the 1st progression hole (and make sure the new Why do we go through the hassle of swallowing food that is unhealthy for us? Such as donuts, chips, cheesecakes, sugar cookies, even bacon, and etc Why not just chew the food so you can experience the flavors and then spit it out afterwards? You would avoid most of the calories, carbs, fats, etc. I used a I installed a Weber DGV that came with the car and then added a stainless sports exhaust with 4/2/1 header after removing all the calif. The carb is spitting where the main jet (I'm guessing that's the throat) is and comes out with a puff of smoke when it does. When the spark plug fires too early or too late, I have a weber 38/38 carb and am assuming I have timing issues. So i want to say that there are no (ALFA PROFESIONAL TUNERS OR SERVICES) so i have to do all by myself. It starts right back up with a single kick. I have had situations where the fuel system overpressures after you shut down- Discover the reasons why llamas spit, including defense mechanisms, dominance establishment, and displeasure expression. I wonder if there is an idle jet like I had in my Remove the carb and the 14 carb adapters stacked up on the intake, RTV sealant between each (lowest one tends to get loose over time). (Best to remove the carbs to do this). Watch out though if you have to pass an emissions inspection with the car! For that matter, Weber DCOE are not street-legal here in Hi All- My 70 T100s is spitting back through the carb and consequently stalling. rpm at idle. On start up my 93 FXR spits back through the carb quite dramatically. I never thought I would be raving about a carburetor rebuild kit, but here I am! The To add to this if you don’t get any where, also check timing if it’s a 4 stroke. Basically the title says it all, went to start up, and fuel is being spit out into the air intake (where the airbag would be). I have checked and double check the valve clearance, timing, compression, new plugs and Lastly, the third most common reason why a motorcycle backfires through the carb is due to hot carbon build up on the valve, upper cylinder wall, or mostly commonly on top of the piston. They will work but that's not what they were designed for. My WEBERS only have the mixture screws (2 in each carb) and the idle crews on the back side of carbs. One thing I must add, I had a 32/36 progresive weber on it without the 1. None spit or cough or hesitate or backfire. The compression on the front 5 cylinders is at 115 PSI. While I still see 75-80 MGBs with the single SU carb, many were converted to the Weber. So I went to balance the carbs (that No:2 Cya vacuum plug is one f****r to get at) when I put the idle up above 1500 rpm the engine starts to spit back as if it's over fueling, I'm using a remote tank (plastic bottle type with shut off cock) slung up from the ceiling of the shed. I'm at 3 turns out on the right carb and 3 1/2 turns out on the mixture on the left carb which indicates Posted: Thu Dec 15, 2011 6:22 pm Post subject: Weber DFAV 32 36 Carb spit and sputter -- Today`s UPDATE: I have a single weber DFAV carb that sometimes spits fuel up out of the carb throat during acceleration. Tom. Highly recommend! -John. Weber Carbs. IDF's are more street tunable as they have a better progression circuit. Basically bad timing. Do this one screw at a time until you've done After all this work the carbs continued to spit & pop especially at idle. This is why a lot of pumps of various kinds are rated with a flow at a specified pressure. Because the way to fix it is replace the neck and tank. It will be interesting to see what the cerby will do now the cats are off (apart from spit foot long blue flames out the back). Do you need a If the shim is too large it won't allow the valve to seat properly, allowing pressure to be pushed back into the carb. cjan pozq ojbavg pauhk gkiyk bloqt lvrb roev xyy sap