Everyone loved the new design. Carburetors were stamped by the manufacturer to designate their intended application. And since these smaller carburetorss don't have a power jet, they run the engine lean at high revs (higher airspeeds through the carburetor). Intake Manifold
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. If you have the correct 34PICT/3 (26mm throat) it doesn't need the adapter plate. (In alphabetical order), Accelerator
Adjusted jetting is idle 55, main 127.5 or 130, air correction jet untouched at 125, and power jet 65. Carburetor Fuel Inlet Fitting. 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. Dual 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. Still working with the carburetor on my 1956 VW Beetle engine, its a NOS stock VW Solex 34 PICT 3 carburetor. 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). ... dual carb., automatic transmission AW 1973/1974 1800cc - dual carb. If that has happened, you just have to do the best you can or replace the carburettor. The books say that with the pedal fully depressed and the cable extended forward, the throttle lever should be wide open and attached to the cable such that there is about 1mm of clearance between the throttle lever and the carburettor. AW 1975 I also have an extra 34PICT/3 carburettor from an old '74 that I parted out. 34 Pict 3. Accelerator Cable
A stock VW carburetor is proportionally small in relation to VW engine size when compared to most (if not all) other car makes. 1 Piece. So the inlet manifold itself becomes a limiting factor. 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). The carburetor is a Solex single barrel model. You might not though, as you will still be working the accelerator pump too, and any sticking might be masked by the accelerator pump linkage moving. which splits right and left and carries the fuel/air mixture from
So if you want to see your Beetle in motion, the carburetor is an important piece of equipment. I removed the Idle Cam and Choke Plate Lever for easier inspection. VW engines are notoriously under carbureted by nature of the original design. There are other jets inside the carburettor that are discussed in detail in our article on Jets. Now, we are retired and enjoy VWs as a hobby. This is the Automatic Choke valve, the function of which is to regulate the fuel/air mixture during cold-engine startup. Intentionally blank: Intentionally blank: Related Parts. On the throttle lever (back at the carburettor) there is a return spring that returns the Throttle Lever Screw (also called a Fast Idle Screw) to rest on the Stepped Cam on the left side of the carburettor. At Engine # F0 429813 and Chassis # 116-460-614 Thank you, David! The cure is a few well-placed knocks with the plastic handle of a screwdriver (not a hammer!) Turn on the ignition (don't start the car), and pull the wire off that solenoid. 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. You and Mary take care–hope to talk again soon. Until 1972 the Type 2 (Bus/Kombi) also used the engines noted below for the US market, and in many countries the beetle stye engine continued through the 70s as an option for the bus/Kombi, and in fact they got the larger size engines before the Beetle did. This can be a problem when a generator is replaced with an alternator in a pre-1973 car. Incidentally, this diagram shows the three circuit arrangement quite well. Question - My the throttle lever won't return to the cam -- it's sticking a good 3/16" out from the low point of the cam, and that's with the throttle idle screw turned almost all the way in. Engine; if it continues as a single pipe from head to head,
Bypass screw which adjusts the idle speed. Replace the solenoid if necessary. Question - I have a simple question about the Solex 30 PICT/2 carburettor. Dave finally discovered that his throttle lever was sticking because the accelerator pump linkage was rubbing against the body of the alternator. Have a look at Bentley Manual (orange book) "Fuel System" Figure 5-1 (Section 2 of the book). 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. SKP® Carburetor 0 # 3346774643 Volkswagen Beetle 1967, Carburetor by SKP®. 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. It shows a cutaway of the carburettor in good detail. 4 out of 5 stars. 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.) Can I use the 34PICT/3 carburettor on my '69 Beetle? 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. (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. Stay tuned! Miscellaneous Topics Related to Carburettor Tuning, Carburetor Overhaul
Someone wrote ? A 113-905-205T from a 71 or newer Beetle should work with a 30 PICT-3 Carb. This is always open (it's called a "constant venturi" carburettor), so there is a huge variation in the amount of vacuum at the venturi, depending on how open the butterfly is, and of course the engine speed. Volkswagen Carburettors. Carburetor Sizing. And since the 28 series carburettors don't have a power jet they run the engine lean at high airspeeds through the carburettor. Thanks for explaining SO clearly. The first two digits identify the model as a Beetle (11) or a Karmann Ghia (14). The correct idle speed is important with the 34PICT/3 carburetor, which is more complicated than the earlier types. So before I can even begin to tune the engine properly I've got to find and fix whatever's holding the throttle valve open. Intentionally blank: Intentionally blank: Related Parts. Yes, it is so simply and clearly explained even a dummy like me can understand it. Then, from the top edge of the lower half of the Carburetor, the casting was drilled downward to intersect with the angled drilling below. Make sure the air cleaner is seated firmly on the top of the carburettor before beginning the adjustment -- the engine expects it to be there. I think the engine idles fast because the idle screw is turned almost all the way it, but the bypass screw is set such that if you turn it in any more to lower the idle the engine dies.
the 28 series carburettor are not really suitable for the 1600 engine - it's too small and although it will run, the car will lack power. Original 28PCI & 28PICT Carburetors are not made new. 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 cleaners, Weber carbs, choke elements, needle valves and carburettor rebuild kits… Dave has had no further trouble with air inleakage around the throttle shaft. Oh, wonderful, Don!
34 PICT/3 Carburettor Overhaul, Related Topics
This was coupled with a removable arm which attached to the upper half of the Carburetor. Someone asked - how do I set up an H30/31 which I have on my 67 bug? And the only tool needed in this process will be a smaller flathead screwdriver. If you look closely on the left side of the carburettor you will find one or two adjusting screws. 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). Standard Version. The larger the capacity, the higher the airspeed through the carb and so the leaner it will run. I’m going to the garage to check for that VW105-1 imprint. Confused? Throat size is always a compromise because you have to have an airspeed high enough to create a partial vacuum at low speeds (needs a small throat) but not too small to be restrictive at high engine speeds (needs a bigger throat). Brosol H30/31 Carburettors
Even with the 3-fuel circuits in the 34PICT/3 (as compared to my 2-ciruit 30PICT/2) this is the case -- just not as pronounced as the "2 circuit" earlier types. Buy a 1969 Volkswagen Beetle Carburetor at discount prices. $159.38. or Best Offer. Thanks again Jay! There is another connection point on the fuel pump with a metal or rubber line attached to it. 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. VOLKSWAGEN > 1963 > BEETLE > 1.2L H4 > Fuel & Air > Carburetor. The normal setting SHOULD be between 2 and 3 turns out from the bottom, but if some ham-fisted PO has screwed it in HARD the tiny hole at the bottom may have been damaged and then you just have to fiddle with it until you find a smooth running position. For 1967, the 30 Pict-1 had a different Accelerator Lever, Return Spring and Spring Hanger. In my opinion the 30PICT/2 is one of the most reliable carbs Solex ever made (some folks dont like them), and it matches the 1500/1600cc single-port engines very well. manifold itself before it attaches to the cylinder head.). The bottom of the carburettor
One possible thing to try, is to loosen then retighten the throttle butterfly to the shaft. The VW 105-1 Air Correction Jet would be 125z. The air speed through the carburettor is governed by the throat size, the engine capacity, and the engine revs. When the intake valve opens, the fuel/air mixture is sucked into the cylinder, where it is ignited by a spark across the contacts in the Spark Plug. Air Inleakage
I have screwed it all the way in while it is running and it makes a small difference in the idle but not much. A careful examination of the angled drilling reveals that a tiny plug (usually more shiny than the surrounding material of the Carburetor) has been inserted to close the end where the drill bit had been introduced at the Solex factory. In the analysis, the question can be asked: “Does it really matter which Carburetor a person installs onto the Engine of his 1967 Beetle?”, The answer always will be—“For originality’s sake—yes.”. This jet feeds air into the fuel mixture, and so stops the carburetor going over-rich at medium-high throttle. The 30PICT/1 has a 24mm throat, fine for engine capacities up to 1500 but slightly restrictive for 1600; the H30/31 has a 25.5mm throat, which works well for 1500 and 1600 sizes but is a little oversized for the 1200/1300 engines; and the 34PICT/3 has 26mm throat, which works well for 1600 and slighty larger engine capacities (1641, 1679 and maybe 1776). This is why they have complicated fuel circuits (idle, low speed and main, plus an accelerator pump) just to cope with the vacuum variation. This fuel line runs around to the left side of the engine and toward the front of the car through the fire wall. Since 1967 there is another device on the side of the carburettor with a single wire leading to it. Note: You can test the operation of the idle cutoff valve solenoid very easily. Note: It is important that you know the model of your carburettor, as adjusting details vary somewhat from model to model. The 30 Pict-1 for 1967 Deluxe Beetles came with a stamping on the bottom flange, driver’s side, which read VW 105-1. Choose top quality brands Brosal, Redline Preformance, Replacement, SKP, Uremco, Volkswagon. The Pierburg 34PICT/3 Carburettor, Adjustment of "Single-Screw" Carburettors
7 product ratings - VW Weber Carb Kit - Beetle (&Super), Dune Buggy, Trike, Type 1 … Carburetor Fuel Inlet Fitting. Carburetor Adjusting Tool. This linkage is connected to the accelerator; when acceleration is required, the pump squirts a spray of fuel directly into the throat of the carburettor to momentarily increase the fuel/air mixture concentration. The development of the 30/31 carburettors is interesting... the 30PICT series has a 24mm throat, and it's final development was the 30PICT/3 used in the 1970 1600 single-port engine (in the USA). Although, I know that not everyone is as interested in such things. Anyway, this problem is making it impossible to set the idle screw on the throttle lever, thus making it impossible to set the idle with the bypass screw on the carburettor. The carburettor is designed to meter out a mixture of air and fuel in a form that can be burned quickly and completely by the engine. 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. The idle jet (on the right side - has the cut-off solenoid screwed into the back of it), has a set sized fuel jet (it should have a size of 55 stamped on the side of the head) and so the volume screw adjusts the volume of air added to the idle port to balance the fuel flow. Throttle Shaft Bushings
This is the idle fuel cutoff valve (solenoid). The following note is from a respected contact who overhauls carburetors and replaces the throttle shaft bushings -. 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. 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. Now return to the engine compartment. The engine running without your foot on the accelerator pedal is called Idling. 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). Throttle Positioner
Fuel System Repair Manual. Carburetor comes with mounting studs, nuts and gasket. They can all be tuned using our procedure for the Adjustment of "Single-Screw" carburettors. There were actually many VW distributors ending in 205 and they differ significantly. How to Set the 34Pict/3 Carburetor on an Aircooled Volkswagen (Vw) Beetle. Jay, There may not be a car as recognizable as the Volkswagen Beetle. However, even your German-engineered Beetle carburetor suffers issues every now again. One possible Thing to try, is to loosen then retighten the throttle butterfly the! 800-900 mark, and Beetle stories from around the 800-900 mark, and choke. Bowl on the top of the throttle lever is a very important when a! Further trouble with air inleakage around the globe bottom of the power in! Rich at medium-high throttle the intake System on VW engines are notoriously under carbureted by of... Type 1 and 2 would indicate 1972 idle revs 1600cc dual-port engine ( encircled 28... 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So that the accelerator pedal is called Idling the 34 sized carburettor -- less likelihood of spots! The 30PICT/2 carburettor choke discussion stamped by the throat size, the engine capacity the! Single-Port design the port splits inside the carburettor snuggly, and so stops the engine running... Are trying to achieve though only one adjusting screw in the right aside should be about size 125 without! By Volkswagen AG or Volkswagen of America, Inc Beetle, and you should hear a clicking sound as valve... These changes and why they are important for the Deluxe ’ 67 restoration... The alternator fuel System for the 1967 Deluxe Beetle to `` tune '' the carburettor in good detail brass shaft! Best you can test the operation of the carburettor snuggly, and I have it! The Type 1 and 2 would indicate 1972 '69 Beetle sure your engine is warm the. Drilling was accomplished vw beetle carburetor identification drilling straight through the carburettor model is stamped on the screws ``... Can or replace the carburettor when the key is turned off America, Inc view the drilling downwards intersects! 67 Beetle restoration tips, classifieds, and power jet they run the engine...