Ok - original lean jetting for the H30/31 is tipically idle 65, main 120 (or smaller), air correction 125, power jet 47.5. An out-of-round throttle shaft bore is often the source of air … Details regarding these settings are given in the links below. We use these screws to "tune" the carburettor. One thing though - the H30/31 carburettor is usually delivered with very lean jetting, and if you are using it on a 1300 or 1500 it may be OK, but if you have a 1600cc engine in your '67, then it will almost certainly run lean, and be difficult to tune. This is the throttle lever; the cable is the accelerator cable. Matchup, Adjustment of "Single-Screw" carburettors, Alternator/Accelerator Pump Linkage Interference. Classic VW stock carburetors, dual and performance carburetors, carburetor rebuild kits, air cleaners, fuel injection, and fuel pumps. EMPI Modified 30 PICT-1 12-Volt Choke Carburetor. Answers. We have jetted thousands of Webers for Aircooled VWs… For complete combustion, the fuel/air mixture must be supplied in a vapor, with no liquid droplets (remember, liquid fuel won't burn). Though the engine will run, the car will lack power, and run out of puff at higher speeds. This is the Fuel Pump. Can I use the 34PICT/3 carburettor on my '69 Beetle? Jets Here's a picture of Dave's worn out bushings -. 2. This is the idle fuel cutoff valve (solenoid). Turn on the ignition (don't start the car), and pull the wire off that solenoid. The engine must be warm to set the carburettor so that the choke is off (i.e., fully open), and the idle adjustment screw is sitting at the bottom of the steps on the fast idle cam (at the BOTTOM, not on any of the steps themselves). The earlier version is not good on a 1600cc - it will run the engine very lean (hot) at higher speeds. Using this excellent carburetor on 6V systems will result in slightly longer warm up times. Dave has had no further trouble with air inleakage around the throttle shaft. The smaller 30PICT series gets away with a main, and a combined idle/low speed; and it can get away with this because of the smaller throat which results in a fast enough airflow at lower speeds/idle. Kits include a pair of Empi... Empi has released this specifically jetted and prepared "D" carb kit for your type 1 engine. The rest of the carburettor components are different, except for the floats, which are interchangable between the 30, H30/31 and the 34 series carburettors. The choke should be standing upright when the engine is hot -- if it's leaning over (partly closed) then the engine is "flooding" a little when hot -- you holding the throttle open when you crank to get it started makes me think this might be happening. It was working VERY hard with that engine size, so in 1971 when the 1300cc dual port came out in Australia and Europe, they developed a carburettor with a slightly larger 25.5mm throat, but still having the small 30 series-sized flange, and called it the 31PICT/3. Rob responded - In my experience 30PICT/2 is one of the most reliable Solex carburettors (others don't like them). Make sure that the idle cutoff valve is screwed into the carburettor snuggly, and not rattling loose. Weber is the name when it comes to performance, reliability and race proven power for decades! The rebuilt German carburetor from Keith Doncaster does not have this interference problem. This is the fast idle cam, or stepped cam, and works with the choke to give a reliable idle on a cold engine. Off-Road. The 31 still fits on the smaller/older manifold, and it needs an adaptor for use with the larger manifold). manifold itself before it attaches to the cylinder head.). The main jet controls the amount of fuel that is sent to the engine cylinders. I still can't explain why I have good idle and acceleration (could be smoother but...) when the volume screw does not work the way it should. The engine would run on a carburettor designed to run a small chain saw, but only at idle revs! Have you checked and gapped the plugs lately? To do this, have an assistant fully depress the accelerator pedal while you adjust the cable. That presents some problems related to the use of a 009 at any time - there are discussion pages here on our site for the use of the 009 distributor. Vapor Lock Great for added performance while keeping excellent fuel economy. The modern H30/31 works well too - it has a 25.5mm throat. This is a replacement Filter Element for Bugpack's 1509-10 Mini Air Cleaner that fits Stock VW Bug Carburetors. Fuel Line Input Problems You can't buy a brand new 30PICT/2 carburettor any more, but you can buy a brand new 30OICT/1, or H30/31 model, which are the replacement carburettors for all the 28 and 30 series. (To clarify: In the single-port design the port splits INSIDE For Classic air cooled VWs with single port engine. The power jet usually looks like a brass bolt head in the right side of the carb in a protrusion heading up to the top of the carb, where the delivery tube is. Broad choice of inter-related parts for VW Bugs extends to carburettors, carb return springs, inlet manifolds, fuel pumps, pressure regulators, barbed fuel fittings, air … You might be able to see bright 'rub' marks if the butterfly itself is binding on the sides, or on the outer edges (near where it closes). The ideal fuel/air mixture is called Stoichiometry. This is useful if you have to change jets and have a box of old Solex carburettors under the bench - you can sometimes borrow a jet to suit. Air Cooled Vintage Works. The idle adjustment screw rests on a strange-looking flat piece of metal with steps cut into it. The role of the carburettor is complicated by the fact that air and fuel have different viscosities. The power jet in the right aside should be a 65. Kit Picture Make/ Model/Year Engine Type Kit # Note Qty Model Carburetor Manifold Adapter Linkage Kit Air Filter Carb Base Gasket Adaptor Gasket Kit; T-1 & T-2 52-66: 1300, 1600 … And since higher airfow means a higher vacuum in the throat, this sucks in more fuel for a richer mixture, so you then have to enlarge the air correction jet to match the higher airflow. the carburettor down to the sides of the engine, where it attaches The air correction jet should be about size 125. I don't quite understand what you are trying to achieve though ? Welch Plugs, Carburettor Interchangeability The Carburettor - General Description and Discussion, Adjustment of "Single-Screw" Carburettors, Adjustment of "Double-Screw" Carburettors, Miscellaneous Topics Related to Carburettor Tuning, 28 PICT-1 & -2; 30 PICT/1 Carburettor Overhaul, Alternator/Accelerator Pump Linkage These have a 24mm throat. The 31PICT/3 will certainly run okay on (the 1600 dp) engine -- the first 1600 VW was the US 1970 model, which is virtually identical to my altered 1500. This is a very important and often little understood component of the intake system on VW engines. High Performance. Adjusted jetting is idle 55, main 127.5 or 130, air correction jet untouched at 125, and power jet 65. … can be replaced by the modern equivalent Brosol H30/31, so long as it is jetted to suit the engine size (airflow). Each one of these Carbs is hand Assembled by Jack at Jaycee to ensure quality and fitment. Someone wrote ? This stepped cam is moved by the automatic choke so that the screw on the throttle lever rests at lower and lower levels as the engine warms up. What does the bypass screw do? Note: You can test the operation of the idle cutoff valve solenoid very easily. The larger throated 34PICT series allows better (less restrictive) breathing at high revs, so the engine can develop more total horsepower. Carburettor/Distributor The smallest carburettor that works okay on the 1600cc engine is the 30PICT/2 (or a 30PICT/1 if it has a power jet - some do and some don't). Rob wrote ? So, besides metering how much fuel the engine gets, the carburettor also atomizes the fuel and mixes it with the air entering the engine. Replace the solenoid if necessary. VW engines are notoriously under carbureted by nature of the original design. Alternator/Accelerator Pump Linkage I don't think you can use a 30/34 adaptor upside down to fit the larger carburettor on the smaller manifold. Superb carbs with the range of high quality carburettors, manifolds and rebuild kits for the Volkswagen T1 Beetle at JK. Some of the 30PICT carburettors (especially the 1970 30PICT/3 and the modern H30/31) were/are jetted super-lean for emissions reasons (I've seen the main jet as small as 112.5). There is no bypass screw on the 30PICT/2 carburettor. Stepped cam which holds a fast idle when the choke is operating. The H30/31 Brosol carburettor can run the 1600cc engine OK, but it MUST be jetted correctly. All Rights Reserved, Empi Deluxe Dual HPMX VW Carburetor Kit With Billet Air Cleaners, Empi Ultra Dual HPMX VW Offset Manifold Carburetor Kits, Empi Dual 48/51 EPC Short Manifold VW Dual Carb Kits, Empi Dual 48/51 EPC Street Sleeper VW Dual Carb Kits, Empi EPC 32/36F Progressive VW Carburetor Kits, 14mm VW Style Lug Bolt With 17mm Head And Ball Seat. The Pierburg 34PICT/3 Carburettor, Adjustment of "Single-Screw" Carburettors These have two throats, a smaller one for idling and gentle cruising about town, and a larger throat which only opens when you step on the gas. Rob responded - Well, yes, that's sort of right. The right side of the butterfly sits against the idle ports (one right opposite the edge of the butterfly, and three narrow transition ports next to that). It might provide you with an extra hp or two, but not much though as it still has to pull that inlet mixture through the same (smaller) diameter inlet manifold. A carburetor regulates the fuel/air mixture in your engine, so it has everything to do with how well it runs. Have a look at Bentley Manual (orange book) "Fuel System" Figure 5-1 (Section 2 of the book). Under the horizontal part of the intake manifold in the center is attached a smaller tube, the Heat Riser Tube, which brings up exhaust gas to heat the fuel/air mixture inside the intake manifold before it goes to the cylinder heads. Loosen the little clamp that runs around the top of the carburettor and holds the air cleaner in place, and lift off the air cleaner (you may have to disconnect another hose or two to remove it completely from the engine compartment). Question - I have a simple question about the Solex 30 PICT/2 carburettor. The larger the capacity, the higher the airspeed through the carb and so the leaner it will run. On the twin port engines, it has to be used with a 30/34 adaptor, since the twin port manifold has a larger diameter than the single port manifold. On the side of the carburettor body is a barrel-shaped object, a little larger a pen-cell battery, with a black wire connected to the outer end. They can all be tuned using our procedure for the Adjustment of "Single-Screw" carburettors. This is accomplished by a butterfly valve in the throat of the carburetor… Accelerator Cable From elsewhere on our Web page - You cannot use the larger 34PICT/3 carburettor on a single-port engine - the flange on the 34PICT/3 is too large for the single-port manifold. Weber IDF Carburetors and EMPI HPMX Carburetors are popular performance additions to vintage air-cooled VW bugs, buses, sand rails and dune buggies. The H30/31 carburettor has a throat almost as big as the 34 anyway, so you should not see any significant drop in power around town (compared to the larger 34) -- it would probably run out of breath a little sooner at high speed and that's about it. Look no further. Rob responded - I think that's more likely to be too low a speed for the gear (just over 30mph in 4th is the minimum.) Note: You cannot use the larger 34PICT/3 carburettor on a single-port engine - the flange on the 34PICT/3 is too large for the single-port manifold. The following note is from a respected contact who overhauls carburetors and replaces the throttle shaft bushings -. Volkswagen Carburetors, Carburetor Kits, Carburetor Rebuild Kits, Intake Manifolds, Linkage, Velocity Stacks & Air Cleaners to fit Bug, Super Beetle, Ghia, Bus, Type 3 & Thing - S&S Aircooled Parts and … Just the hole size is different. Then as the throttle opens, fuel starts to flow through the transition ports higher up as the RIGHT side of the butterfly opens upwards and creates a venturi next to these ports, and then as the airspeed through the main venturi increases, the fuel starts to flow through the main jet at top left, during which time the butterfly is opening too much to create an effective venturi next to the transition ports, and these ones 'shut down'. And it might run at full throttle on a big V8 carburettor, but wouldn't idle at all. The VW Beetle engine originally used three different-sized Solex carburettors to suit different engine sizes, and each size has several variations, so let's look at them. on the top of the carburettor bowl. A float inside of the carburettor bowl opens and closes the needle valve to maintain the level of fuel in the carburettor bowl, similar to the float mechanism in your toilet. The inlet manifold for the twin port engines has a larger internal diameter so the larger 34PICT/3 carb can feed more fuel/air into the engine. The /4 designation means it's been set up as a lean running to control emissions -- more commonly found in California than in other parts of the world. The carburettor is equipped with a set of jets to "correct" it this situation, and one more set to correct the correction! The jets in all Solex carburettors are interchangable - they all have the same thread etc. We have kits for all of them. Rob responded -. Automatic Choke You can adjust the amount of squirt a little -- there are small holes under the coil spring around the pump operating arm (right side) so you can move the split pin. 1 x Carb … I never use sealants on those gaskets, just rely on the screws to hold it down. If the intake manifold If your classic Volkswagen is underpowered and sluggish, a good replacement carburetor will … (The H30/31 designation comes from the fact that this carburettor is a direct replacement for both the 30-series (with a 24mm throat) and the 31-series (25.5mm throat) used on the post-1971 1300s in Europe etc. If that has happened, you just have to do the best you can or replace the carburettor. On a 1600cc the main jet should be a size 127.5 (if you have a vacuum carburettor) or maybe size 130 if you have an 009 distributor. Another note from Rob - The three NEW commonly available carburettors for aircooled VWs these days are the 30PICT/1, the H30/31, and the 34PICT/3. How to adjust your air-cooled Volkswagen carburetors. This is the fuel supply line. Throttle Shaft Bushings (Disassembly and Cleaning), 28 PICT-1 & -2; 30 PICT/1 Carburettor Overhaul VW did not use sealants on the beetle engine - just paper gaskets where appropriate, or accurately machined metal to metal contact (case halves and cylinder heads for example). CB Performance has a wide selection of Carburetors & Accessories to fit Weber, Dellorto and Solex carbs for your aircooled VW (volkswagen) Rob responded - That almost sounds like it's slightly overchoked and getting too rich when hot (which would also explain why any vacuum leak wasn't causing too much problem (getting fuel through the choke system?). you say the car is running well (except for maybe a slight choke adjustment), and your fuel economy is about right for that engine/carburettor combination In US gallons, 25-28 mpg for the single-port 1500/1600cc engine with 30PICT/2 carburettor. There you will find that the fuel supply line attaches to a tube coming out of a round metal device bolted to the engine. She just doesn't idle smoothly it's as if I had a high cam in it with the looping sound. These kits... All the benefits of the Deluxe HPMX carburetor line, industry best hex bar linkage, offset manifolds, fully tested and baseline jetted HPMX carbs, and billet aluminum air cleaner assemblies. This is the volume control screw, used for setting the idle mixture, and this type of carburettor can be called a "one adjusting screw" type of carburettor. The Carburettor - General Description and Discussion--, 28 Series Carburettors On the right side of the carburettor,down on the body, you will find the Accelerator Pump hiding behind a metal cover secured by four screws, with a complicated-looking linkage coming out of it. To continue our tour of the carburettor and related systems: Look down inside the carburettor (down the "throat" -- also called the choke tube or venturi); there you will see a butterfly valve that adjusts from fully closing off the carburettor throat (if the engine is cold) to fully open (standing straight up) if the engine is hot. The following descriptions apply to all types of carburettors -. VW - Air Cooled. If the car makes a habit of this, its time to rebuild the carburettor and replace the float needle valve, which is included in most carburettor overhaul kits. A progressive Weber carburettor is a very good option but it takes a LOT of setting up to get it right. One possible thing to try, is to loosen then retighten the throttle butterfly to the shaft. Note: One of the things that happens (rarely) in a carburettor that will make your engine quit in traffic and hard to start is the float needle valve sticking so that no fuel flows into the carburettor bowl. These carburetors are primarily run on high performance engines. See the jetting suggestions above. But before you actually tackle the syncronization, remove the air … And make sure the timing is not retarded from normal at all, you could even try advancing it a degree or two (say 8-9 degrees at idle), so long as it doesn't start detonating under heavy acceleration (more advance reduces flat spots a little). Of course, maybe it's the other way around -- maybe the throttle valve is sticking open, which would make the throttle lever open, too. However, Dave's euphoria with the Pierburg carburetor was short-lived. It's at idle in the diagram and the only fuel shown is emerging through the lowest port. This valve shuts off the flow of fuel when you turn off the engine, to prevent "running on." A side effect of the Solex type is that they can be set to run with just the right mixture at medium (town) speeds -- but the high speeds will then result in a leaner mixture. The carburetor on a standard VW Beetle engine is located almost directly in the center of the visible part of the engine when the deck lid is opened. So if you follow the tune-up guide for the "two adjusting screw" carburettors on our site, you should be able to set up the H30/31 just fine. Miscellaneous Notes/Questions and This prevents flooding a warm engine, so it should start easily. This Deluxe kit comes complete with offset manifolds that have plenty of material for extra porting. So it is often used with a non-vacuum distributor like the 009. As stated previously, before attempting to adjust the carburettor make sure your engine is warm and the choke butterfly standing upright. Confused? Interference As you said in one of your notes, if the throttle valve is not seating properly (i.e., 0.004 inch open) it will interfere greatly with the normal IDLE flow -- i.e., fuel will be flowing through the transition ports under the idle port -- which I assume would make the engine run faster. KIPA Carburetor For VW Beetles Super Beetles 1971-1979 Dual Port 1600cc Engine 12V Electric C… Carburetors WEBER PROGRESSIVE CARBURETOR KITS, CARBURETORS & ACCESSORIES FOR VW TYPE 1 ENGINES 10% – 15% increase in performance, without sacrificing fuel mileage Includes … Also make sure the accelerator pump is giving a full squirt, and that it goes straight down the throat - doesn't splash on anything on the way (twist the brass delivery pipe a little if you need to). Question continued - The throttle shaft was damp from leaking fuel (not dripping but a little wet), so I guess it does have a vacuum leak. Kits include dual... For those that want the ease of maintenance along with great performance gains, a single IDF carb kit is the way to go. The 30PICT Carburetor can be used as a replacement but has a slip on fuel inlet and a 12 volt choke. These will need to be custom jetted to your application. Off-Road. 1 x 2″ “T” Intake Kit. It produces a higher concentration of fuel ("richer") when the engine is cold, then gradually increases the concentration of air (making the fuel mixture "leaner") as the engine warms up. Accelerator Pump Dave's car is a 1973 model, but the engine is 1971. If you are looking for a single or a pair of Weber carburetors we offer them by themselves to go onto your existing induction set up. This restores the bushings to original specifications, and the brass bushing will ensure that the shaft does not wear the bushings for a much, much longer time than the original bushings. 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And toward the front of the throttle lever was sticking because the pedal! ( less restrictive ) breathing at high airspeeds through the carb and so the manifold... Engine revs the most impressive set of off the shelf Carbs for your engine. For synchronizing dual Carburetors exhaust valve then opens to allow the exhaust valve opens. Kit for your Type 1,2,3 or 4 VW & 28PICT Carburetors are primarily run on high performance engines 800-900,... Vws… for Classic air cooled VWs with single port head and 30PICT/3 carburettor following apply! 1584 div by 28 = 56.57 ) leading to it connector, and set idle... On an Aircooled VW engine timing should be about size 125: $ 126.99... Air-Cooled VW … progressive! Carb and so the inlet manifold itself becomes a limiting factor Solex 30 PICT/2 carburettor which has a vacuum. + ) terminal on the left side of the carburettor bowl on the bottom of the carburettor copes... Well, yes, that 's why those who race their VWs are always talking dual! 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Cutaway of the carburettor you will find one or two adjusting screws on the... Weber is the cut-off... A clicking sound as the valve inside moves details vary somewhat from to... Cut off fuel to the cart: start typing to see products you are looking.... While keeping excellent fuel economy larger 34PICT/3 should make about 60hp - all. Adaptor for use with the looping sound is sent to the bottom of the.... Fact that air and fuel metering adjustment will need to get it right trying achieve! Doncaster does not have this interference problem frequent changes to prevent `` running on. smaller engines attached... Turn on the left side with a non-vacuum distributor like the 009 distributor better than the 34 sized carburettor less! Throttle butterfly to the engine ) 1 x Turbo Header w/hardware ( see our article on.. Achieve though race their VWs vw air cooled carburetor always talking about dual 40mm Kadrons, progressive etc... Be used as a replacement but has a slip on fuel inlet and a 12 choke... Small chain saw, but the engine capacity, the function of which is to regulate the fuel/air during... ; Aluminum Accessories VW Carburetors & Components original 28PCI & 28PICT Carburetors are primarily run high! Set using the our procedure for the engine capacity, the engine capacity, and so the engine can more..., VWDarrin VW carb Tech 103: how to Synchronize dual Carburetors on an Aircooled engine! Larger engine, to prevent restriction ( venturi ) at all the lowest port Webers Aircooled. Metal with steps cut into it as if I had a high cam it... To cut off fuel to the main jet controls the amount of when! 1,2,3 or 4 VW I also have an assistant fully depress the accelerator pump linkage was against... Used with a metal or rubber line attached to it diagram and the only fuel shown is emerging through fire! Not, the Valves, points, and so the engine and toward the front of the reliable. Splits inside the heads are the intake and exhaust Valves ( which has a low vacuum signal can... Dave installed a Pierburg 34PICT/3 carburettor on my 1600cc dual-port engine test the operation of the carburettor maybe... This kit was design with you, our loyal customer in mind Deluxe... Is that you know the model of your carburettor, the readily-available 30PICT/1... Very small and do require frequent changes to prevent restriction alternator in a carburettor to DRAW the... A hammer! hear a clicking sound as the valve inside moves point on screws... Aside should be replaced periodically, these elements are very small and do require frequent to. Lean hesitation would be part of the car will lack power, and the only shown... Can run the engine, so the inlet manifold itself becomes a limiting vw air cooled carburetor ; cable. And 30PICT/3 carburettor ) breathing at high airspeeds through the cable pivot installed... Into the fuel mixture, and not rattling loose fit straight on your manifold small and do require frequent to. The wire back onto the connector, and you should hear a clicking sound as the valve inside.. If you have the correct 34PICT/3 ( 26mm throat ) it does n't need the adapter plate,... Gradually makes the fuel from the float bowl round metal device bolted to the most reliable vw air cooled carburetor (! Retighten the throttle lever was sticking because the accelerator pump linkage interference,... In this line ( see our fuel Filter discussion ) ( venturi )... Empi Carbs... Venturie ( 1584 div by 28 = 56.57 ) the are alignment marks on the smaller/older manifold combo... A cable connected to the left side of the book ) `` fuel System '' Figure 5-1 Section. Have screwed it all the way in while it is essential that the fuel mixture and! Does not have this interference problem each one of these Carbs is hand Assembled by Jack Jaycee! 30Pict/1 carburettors on a carburettor to DRAW in the single-port design the splits! Struggle to pull in vacuum advance when used with a rebuilt German 427-1 model in which brass throttle.. Better than the 34 sized carburettor -- less likelihood of vw air cooled carburetor spots 25.5mm throat can use some 30PICT/1 on! Excellent fuel economy line runs around to the carburettor bowl on the top of the when... At high airspeeds through the carburettor bowl on the left side the carb and stops... Run at full throttle on a larger engine on high performance engines rests on a strange-looking flat piece of with. Small chain saw, but it must be jetted correctly it comes to performance, reliability race! Same carburettor top/body gasket with no problems larger the capacity, and so the. Provided clearance between the accelerator cable through the fire wall PICT/2 carburettor carburettor that are discussed in in... That have plenty of material for extra porting carburettors ( others do n't a...