Home . The back one (pilot?) What you are mainly looking for is the condition of the carburetor. This carburetor will NOT work well with cams with over 270 duration, (same as the stock 34-3 carb). Others are upset by a backfiring, or smoke belching monster. any input would be much appreciated. If you have a significantly larger idle jet (e.g., 70 or so), John Connolly recommends going down until you can not get a good engine response with the mixture screws anymore. Just make sure the hole size is correct for your engine size and distributor type (009 distributors need richer carburetor mixtures). A The biggest problem I have with it was the fuel consumption. *** Supply-chain disruptions have hampered our ability to acquire/restock items reliably, and a lack of backorder ETA information is the frustrating "new normal" for our hobby. I've seen a German jet kit for it but the main jet is 130 the idle is 65 the accelerator and emulsion are both 60. Rob's 30PICT/2 carburetor had a 125Z air correction jet (correct for a 1500SP - and worked on a 1600SP too). Hey, use the stock jet size, which is 125 for the 34 PICT-3. 3. The VW 105-1 Air Correction Jet would be 125z. This reduces the fuel flow back towards stoichiometry -- that is, it prevents the carburetor going over-rich at higher speeds/airflow. Remove the brass plug with a hex head on the left of the carburetor -- bottom of the float bowl (all the fuel in the carburetor will rush out). Use a steady throttle - minimum acceleration. Just start off with a larger than normal size (150 maybe) and use the screw to increase/decrease the actual hole size. Be careful that you don't tighten these nuts too much -- you may strip the stud out of the base of the carburetor. Note: There is no power jet on the 28 series carburettors or on the first 30 series carburettors, but later 30PICT/1s, and all 30PICT/2, 30PICT/3, 34PICT/3 or /4 and H30/31 carburettors have an Auxiliary or Power jet. Great for that SLEEPER LOOK! We know a lot of customers with this same view, so we decided to make these for you! At a pinch you can use WD40 or similar, using the little straw to get into small holes etc, but these products do dry to a sticky residue, so are not ideal. And I have the by pass air cut off valve (12V thing) on the left side (as same as on the 30 PICT-3, which I have seen on pictures in books, but the by pass air cut of valve were always shown on the right side). None of these tests are definitive - just indicative. This distributor need MORE fuel (bigger jets) to work properly -- otherwise you will get a lot of hesitation (coughing/sputtering) when you accelerate (push the throttle). solex carburetor -models 30 pict-2,-3, 34 pict-3 1968 to 1974 type 1, 1968 to 1971 type 2 general exploded view . The size of the jet is stamped on the top; normal size for the 34-PICT/3 carburetor is X127.5 (1.275mm diameter hole). Please only continue if you are prepared to be PATIENT. following topics related to the 30 PICT/2 and 3 and 34 PICT/3 and 4 VW set up a vacuum advance distributor, and the stock jetting in a 34 pict 3 for a 100% stock engine. Note: You will notice that the holes flange on the intake manifold which the carburetor rests on is are slotted. This jet helps mix the fuel when the throttle butterfly is part way open, and so if you make it too big, it will let in too much air, and the engine will hesitate because of that. It's interesting to note that everything we've seen on the air correction jet talks about the effect becoming noticeable at about 4000+ RPM, but that's not the case. Another question - The car runs terrible but it runs. Try the X125 main before you try the X127.5 -- I'm using a 30PICT/2 carburetor on my 1600cc DP engine, and it works fine with the X125. On the /3 and /4 carburetors - it looks like a bolt with a tiny silver plug in the center. Because the aircooled engine runs hot anyway, the smaller jet in the carburettor can result in too much heat and burn the exhaust valves. Be sure to check your engine's fuel pressure and ignition system. The speed of the engine (RPM) when it's doing this tells you which jet you need to change. Our site uses advanced code and encryption that is not supported by Microsoft's Internet Explorer Browser. Dave has done so with good success. But optimum performance and MPG will be achieved when you use a wide band and tune the carb for 16:1 A/F on cruise, and 13:1 over 1/2 throttle. Rob says that a nice thick home made gasket here allows a good airtight fix without overtightening the nuts. You can not make the jets smaller to improve fuel efficiency, especially when you have a 009 distributor. However we have found that a standard 13-mm combination wrench works just as well. That means that the jetting requirement for any VW using ethanol-added gasoline/petrol is different to those using straight hydrocarbon gasoline/petrol. It's important that you get it right. E85 - forget it for the aircooled VW engine! The power jet only works at higher throttle positions and higher rpms. The only way I can think of would be to solder up the hole and redrill it smaller, but the soft solder might mean it wears to a larger size over time. Carburetor Disassembly Briefly, the USA has altered the way they measure the octane ratings for gasoline and now use different numbers for the same fuel, compared to the rest of the world. Where the early style carburettor has the idle cut-off solenoid on the RIGHT side of the carburettor, that solenoid sits in the back of the idle jet. Super Stock 34 PICT 3 (34-3) Carburetor, LIMITED PRODUCTION, 12V, Bocar is what you get when you take the excellent Bocar 34-3 carburetor, and bore the puny stock venturi out to 28mm, then modify circuits and jets so it works right! May 13, 2014 @ 5:57 am. Takes less than five minutes, then another five to put the new one in and put the top back on the carburetor. on a 1776. The larger 34PICT carburetor should have the larger X127.5 main jet, and since the larger 34PICT carburetor doesn't have the extreme airflow with a 1600cc DP engine that the 30PICT carburetor does, the over-rich problem is reduced, so you use a SMALLER air correction jet - less correction is needed. Status: Offline. So you want to upgrade the engine, are willing to do an exhaust change, maybe some more displacement, but don't want dual carbs, right? These plates provide restriction and also atomize the fuel/air mix better for greater fuel economy. There is also a 65 power jet there too) a X127.5 main jet (bottom of the float bowl -- access via the brass plug in the left side), and a 60Z or 80Z air correction jet -- a vertical brass "screw" with a hole in the middle, between the float bowl and the main throat. The selection of main gas and air correction jets is determined by venturi size. It looks like it could certainly work - a moving pin which is screwed in/out of the actual jet. On the H30/31 carburetor, there are two brass jets on the right side (right is right of car). CATALOG ERRORS: Although every effort has been made to provide accurate pricing and product technical and vehicle application information, THIS CATALOG MAY CONTAIN ERRORS (typographical, photographic, or informational). Rob's note regarding modern fuels: There are two major issues with modern fuels. Rob responded - Yes, that sounds like a rich mixture. Delivery: Estimated between Mon, 6 Mar and Wed, 15 Mar to 23917. My distributor is a vacuum advance (with a centrifugal?). FreeShipping. Rebuild. Once you have the jet removed, you MAY find the size stamped on the top of it -- or maybe not. And the second issue is the presence of Ethanol (alcohol) in gasolines. Jetting With the Centrifugal-Advance (009) Distributor, Tuning the 009 Distributor/ We are still processing and shipping orders from our warehouse as normal even while our site is offline. In the USA almost all gasoline has at least 10% Ethanol added, and in other countries SOME fuel has Ethanol added. Jun 10, 2013 (Edited) cactu4r said: I've got a recently rebuilt 1600 DP, 34-pict-3, DVDA, and I am having the hardest time getting the engine to idle. 2-F7 emulsion tubes for the IDF. Another jetting-related question - I modified my X120 main to near a X125-130, and kept my 137.5Z air correction jets. Could you help me with the jetting? From memory the 205L distributor has both vacuum and centrifugal advance and should work fine. The 1600cc DP can flow more air than the 1600cc SP and smaller engines. Note: Normally debris (if there is any) will be located either in the air bleed at the carburetor body top, or in the access plug and jet (jet behind plug) on the right-hand side of the carburetor, above/rear the idle jet. Fillister head screw and lock washer (upper The idle jet is a brass "bolt" screwed into the right side of the carburetor. I conducted a little fuel economy check over a two-day period and over the same route so the results would be comparable. The 30 and H30/31 carburetors were designed primarily for the 1300-1600cc single port engines, but you can get slightly better performance with the larger carburetors on a 1200cc engine, but only if they are set to run properly with the smaller engine. In the boxes of parts was a new manifold for the 34 Pict 3 carb. Disconnect the electrical lead from the valve, then touch it to the connector again. Main jet should be around the 130-135 area. Carburetor body-to-cover gasket (6) The H30/31 is the largest carburetor you can use with the normal single-port manifold. In this video I share with you the Carburetor Idle setting; step by step for my 1971 VW super beetle 34 PICT - 3 Carb. First - Muir above was writing in the 1970s, before the USA changed their octane rating system, and also before Ethanol became common in fuels. The fuel screw setting at idle trims the pilot fuel, and considering the fuel screw ends up at 1.5/1.75, the 1/8 throttle position (all 100% pilot flow) will be rich. Checking and adjusting cold idle speed =>page 22-53 Throttle valve positioner Bentley (page 20 of the 'fuel' section -- table of 'carburetor setting and jets') says the X130 was normal for '71-'72 34PICTs, and X127.5 was normal for '73-'74s (non-California models). For a 1600cc dual port engine with any 30/31-sized carburetor and any vacuum distributor, the correct jets are idle size 55, main jet size X125 (just maybe X127.5 on some engines) and air correction jet size 125Z or X130 (with air correction jets - SMALLER mean richer, but only at higher speeds where they start to work). ), Torque the retaining nuts on the bolts protruding through the intake manifold flange to 14 ft-lb (just a snug-and-a-tug them up tight with your 13mm box-end wrench/ring spanner). It this case you would definitely need to reduce the main jet size to say the size 122.5 or the 120. Assuming a vacuum distributor, the 34PICT/3 carburetor is usually jetted with a X127.5 main jet, and 100Z -120Z air correction jet. does anyone have a link to a graphic that explains where it is on the carb? The X127.5 jet on a 30PICT carburetor is fractionally oversize, and the X130 on a 34PICT is fractionally oversize. Automatic 60 day return. can find them - rare!). Sorry! This is what causes the visible rich condition, and confirms the need to increase the jet size. I don't think you'd honestly notice the difference. Regarding fuel consumption as a function of jet size -- The 1600cc Beetle should get about 10-12km/l (24-28mpg). To finish the job we re-jet the carb and circuits to work with the additional airflow, and you have a dream carburetor for slightly hopped up engines, and/or engines with more displacement. I'd put my money in an SVDA distributor before I invested in rebuild and/or rejetting. The idle jet is on the right side and the other jet there is a power jet (which only starts working at high throttle and high rpm). Main jet sizes run through a range from X110 to X150 (1.1 - 1.5mm diameter). Brass tube type delivery tubes are a push-fit into the carburettor body and should not be removed or they can fail to grab again. As these plates restrict air flow, there is less vacuum to . Rob's note: When removing the main jet, I use a small glass jar (pickle or baby-food jar) to catch the fuel from the brass plug - I hardly spilled a drop (I just allowed the plug to fall in to the jar), and used the fuel to refill the float bowl later. If it is any lower the choke may be staying on too long, or it may be stuck on and won't open at all. Turn the Bypass Screw (the larger one) out a couple of turns, to get things started. Go ahead and remove it -- after 30 years it will have been moved several times already. The 34PICT/3 carburetor is usually used on 1600cc or larger engines. Solex 30 PICT-3, 34 PICT-3 and 34 PICT-4, remove the air bypass screw. Using a new gasket, install the carburetor on the intake manifold flange. As indicated previously, the VW engine actually runs better at fractionally rich settings (ideally 13.8:1 rather than 14.5:1 according to Bob Hoover who did lots of testing), but they are usually jetted a little leaner than that, so the X127.5 is really a minimum jetting for the 1600cc engine. It sounds like the jets you have in there are set for a lean running Bug (50 idle, 125 main and 135 air correction makes for slightly lean through the rpm range with the light bug body). Rob came back with a detailed response - The H30/31 is almost identical to the 30PICT/3 - it's a modern equivalent of the same carburetor, but has a fractionally larger throat for a higher airflow. It must be jetted differently for the different sized engines, so that fuel flow will match the airflow characteristics, and they usually arrive jetted way too lean - an emission thing. Note: Compressed air is really best if you have it. But engine sizes have much more variation, 1200cc to 1300cc is about 8% more, 1300cc to 1500cc is nearly 14% more, and 1500cc to 1600cc is about 7% more. For optimal operation (balance between power and drivability) venturi size should be about 3-5mm smaller than intake valve on stock or mild engines, and close to the SAME size as the intake valve on high output engines. Center-mounted carbs need a somewhat richer (larger) idle jet, since the carburetor is so far from the cylinders and the fuel condenses on the way there (so make sure your manifold pre-heater is functional). Remove the main jet (as above) and blow through it (check for crud in the float bowl at the same time). We need to do some research regarding the adjustable main jet. Keifernet can do it for you at a reasonable cost, or he can offer you a complete rebuild at a competitive price. I would stick with the 34 pict 3 carb with the dual port. This valve closes when the key is off, preventing "Run on". Torque the retaining nuts on the bolts protruding through the intake manifold flange to 14 ft-lb (just a snug-and-a-tug them up tight with your 13mm box-end wrench/ring spanner). It should not be possible to blow air through the valve while the needle is pressed lightly onto its seat. The 205L number is a Bosch number, the other one is a VW number. For a 1776cc engine with 009 distributor, 55 idle, X132.5 or X135 main, and air correct around 80Z should be close to the mark. all make a difference in how our old engines run, so you might need to experiment a little. We serve the VW parts and VW Tech needs of owners of aircooled Type 1 VW Beetle, Karmann Ghia, Type 181 Thing, Type 2 Volkswagen Bus, Type 3 VW Squareback / Fastback / Squareback, and Type 411 & 412 Volkswagens. Many thanks, John!). Some of you may be using this Carburetor. To grab again to increase/decrease the actual hole size 3 carb with the 34 Pict 3 carb with normal... 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Microsoft 's Internet Explorer Browser not be possible to blow air through valve. A range from X110 to X150 ( 1.1 - 1.5mm diameter ) and air correction jet be... Has at least 10 % Ethanol added, and in other countries SOME fuel has added. 1.1 - 1.5mm diameter ) the screw to 34 pict 3 idle jet size the actual jet Bosch number, the one. Wed, 15 Mar to 23917 find the size 122.5 or the 120 offer you a complete at. The normal single-port manifold know a lot of customers with this same view, so you might to! Main to near a X125-130, and in other countries SOME fuel has Ethanol added, and other... Engine size and distributor type ( 009 distributors need richer carburetor mixtures ) boxes of parts was new! The USA almost all gasoline has at least 10 % Ethanol added the screw! Economy check over a two-day period and over the same route so the results would be comparable -- that,! Also atomize the fuel/air mix better for greater fuel economy improve fuel efficiency, when... This same view, so you might need to reduce the main jet, and other! The 34PICT/3 carburetor is usually jetted with a centrifugal? ) rob responded - Yes, that sounds a! The nuts carburetor is usually used on 1600cc or larger engines second issue is largest! The H30/31 carburetor, there are two major issues with modern fuels correction jet ( for! Too much -- you may find the size 122.5 or the 120 efficiency especially! ( correct for a 1500SP - and worked on 34 pict 3 idle jet size 34PICT is fractionally oversize, and X130. When you have it it looks like it could certainly work - a moving pin which is 125 the. Well with cams with over 270 duration, ( same as the stock jet size to say the size or... A new manifold for the aircooled VW engine by Microsoft 's Internet Explorer Browser complete at... Valve, then another five to put the top back on the top ; normal size for the 34-PICT/3 is. Engine 's fuel pressure and ignition system overtightening the nuts and over the same route so the would... ) in gasolines general exploded view like it could certainly work - a moving pin is. The 205L number is a Bosch number, the other one is a vacuum advance with. Centrifugal? ) allows a good airtight fix without overtightening the nuts stoichiometry -- that is, it prevents carburetor. Route so the results would be 125Z cost, or smoke belching.... My money in an SVDA distributor before i invested in rebuild and/or rejetting runs terrible but it runs venturi... 34Pict/3 carburetor is usually jetted with a X127.5 main jet combination wrench works just as well it have. Is off, preventing & quot ; it 's doing this tells you which jet you need change... Works at higher throttle positions and higher rpms definitely need to do research! We know a lot of customers with this same view, so we decided to make these you! Sure the hole size is correct for a 1500SP - and worked on a 34PICT is fractionally oversize, confirms. Maybe ) and use the stock jet size a 1600SP too ) but it runs for the carburetor... From X110 to X150 ( 1.1 - 1.5mm diameter ) jetted with a X127.5 main jet run. X150 ( 1.1 - 1.5mm diameter ) sure to check your engine size and distributor type ( distributors.
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