On the top of the throttle lever is a small screw which sticks out towards the back of the car. Using this excellent carburetor on 6V systems will result in slightly longer warm up times. The single screw in the side is called Volume screw (the larger 34PICT/3 has both Volume and Bypass screws), and it works with the idle jet to provide the correct idle mixture. However, Dave's euphoria with the Pierburg carburetor was short-lived. Off-Road. The earlier version is not good on a 1600cc - it will run the engine very lean (hot) at higher speeds. Available with 40 and 44 HPMX carburetors. Kits include a pair of Empi... Empi has released this specifically jetted and prepared "D" carb kit for your type 1 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. 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. Pass the end of the accelerator cable through the cable pivot pin installed in the lower end of the throttle lever. your engine is Single-Port. This prevents flooding a warm engine, so it should start easily. 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. Question - I've been told that the throat on the 31 is smaller and that's good (I was told) because the air rushes in faster. This valve shuts off the flow of fuel when you turn off the engine, to prevent "running on." This is the Automatic Choke valve, the function of which is to regulate the fuel/air mixture during cold-engine startup. If that has happened, you just have to do the best you can or replace the carburettor. It's at idle in the diagram and the only fuel shown is emerging through the lowest port. Since 1967 there is another device on the side of the carburettor with a single wire leading to it. 1 x Carb … The air correction jet size is very important when using a smaller carburetor on a larger engine. 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 other problem that I have is that the car is hard to start when the engine is hot -- you have to push the gas pedal to the floor and hold it there a while before the car starts (with a little smoke from the exhaust). Directly beneath the fast idle cam on the left side of the carburettor you will see (on the older models) a single screw with a spring wrapped around it. As stated previously, before attempting to adjust the carburettor make sure your engine is warm and the choke butterfly standing upright. Accelerate with 2 barrel performance, cruise with 1 barrel economy. This is the Fuel Pump. Welch Plugs, Carburettor Interchangeability
The later model carburettors have an additional larger bypass screw that is used for setting the idle speed - the fast idle adjustment screw and stepped cam are NOT used to adjust the idle speed on these "two adjusting screw" carburettors. Question - I have a simple question about the Solex 30 PICT/2 carburettor. 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. This is the fast idle cam, or stepped cam, and works with the choke to give a reliable idle on a cold engine. The older carburettors have just a Volume Control Screw, and the later models have both a Volume Control Screw (smaller) and a Bypass Screw (larger). But this smaller throat runs out of puff at higher speeds, the cylinders don't get time to fill completely before the inlet valve closes, as the air/fuel mix cannot get through the restricted throat fast enough. About 23-25 mpg for the twin-port 1600cc engine with 34PICT/3 carburettor is about right (Dave's "29" is extremely good for a 1600cc twin-port engine), but of course it will vary with fuel quality, driving style, tune-up and altitude. Air Cooled Vintage Works. Compressing the coil spring more will make the pump start working sooner for a longer squirt. Interference
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. 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. 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. If your classic Volkswagen is underpowered and sluggish, a good replacement carburetor will … Question continued - I think I have figured out why when traveling in third or fourth at low rpms when I suddenly floor it, it jigs and shakes a bit, I figure I'm flooding the engine and it can't pick up at those speeds! 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. The Pierburg 34PICT/3 Carburettor, Adjustment of "Single-Screw" Carburettors
The 31PICT/3 is a direct replacement for the 30 series, with (I'm guessing) some slight enhancements, and since the number is larger (31 v 30), the throat size is a little larger too, but not as big as the 34. 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. The idle jet should be a size 55, and power jet size 65. since the original oversized idle jet is normally a 65, you can use that to replace the undersized power jet. If the intake manifold
The accelerator cable comes from the front of the car where it is attached to the Accelerator Pedal that you control with your right foot. The main function of the carburetor is to regulate the fuel to air mixture, changing the amount of air … Could this be fixed by adjusting idling? VW PROGRESSIVE CARBURETOR CONVERSION KIT. The problem can be cured by milling out the old aluminum bushings and inserting much better wearing brass bushings. At the bottom of the carburettor is a second butterfly valve, the Throttle Valve (you can't see it, but trust me) which opens to supply air and fuel to the intake manifold and on to the engine. Matchup
These carburetors are primarily run on high performance engines. 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 exhaust valve then opens to allow the exhaust gases to leave the cylinder. Dave finally discovered that his throttle lever was sticking because the accelerator pump linkage was rubbing against the body of the alternator. Adjusted jetting is idle 55, main 127.5 or 130, air correction jet untouched at 125, and power jet 65. 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. Dave's car is a 1973 model, but the engine is 1971. VW Air Cooled. 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). Question - I replaced the volume screw when I rebuilt the carburettor a few weeks ago? Mine's exactly the same except that it has the original 30PICT/2 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. 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. A stock VW carburetor is proportionally small in relation to VW engine size when compared to most (if not all) other car makes. 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. 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