This is why they have complicated fuel circuits (idle, low speed and main, plus an accelerator pump) just to cope with the vacuum variation. 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. Great for added performance while keeping excellent fuel economy. 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 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). There is no bypass screw on the 30PICT/2 carburettor. 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. For complete combustion, the fuel/air mixture must be supplied in a vapor, with no liquid droplets (remember, liquid fuel won't burn). This is a perfect intake system... A true bolt in dual carb kit for your Type 4 based VW motor. Look no further. However, Dave's euphoria with the Pierburg carburetor was short-lived. The H30/31 Brosol carburettor can run the 1600cc engine OK, but it MUST be jetted correctly. VW PROGRESSIVE CARBURETOR CONVERSION KIT. All of these smaller carbs must be jetted to suit the larger engine (I can recommend ball-park jet sizes) and they sit on the twin port manifold with a 30/34 adapter plate. It shows a cutaway of the carburettor in good detail. These have a 24mm throat.
Cardiff CA 92007. Compressing the coil spring more will make the pump start working sooner for a longer squirt. Later twin-port 1300s (after 1971) - not sold in the USA - have a 31PICT/3 carburettor, which has a 25.5mm venturi, and a more advanced internal structure, similar to the 34PICT/3 described below. The modern H30/31 works well too - it has a 25.5mm throat. Fast Idle screw which works with the stepped cam to set the idle speed with the choke on. 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. They sit on the twin port manifold with a 30/34 adapter plate. Stepped cam which holds a fast idle when the choke is operating. Float Needle Valve
Kit includes HPMX carbs, offset manifolds, linkage,... For those looking for ease of maintenance as well as a performance gain we offer the single 40 or 44 HPMX carburetor kit. Adjusted jetting is idle 55, main 127.5 or 130, air correction jet untouched at 125, and power jet 65. 30 Series Carburettors
Probably not this causing the problem -- it should self align as the screws are tightened, but even a few thousandths out might cause it to stick, and this would also tell you if the screws are loose, which they should NOT be of course (probably two screws, and I think you get at them from underneath). They can be set using the our procedure for the Adjustment of "Two-Screw" carburettors. 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. The 28 series carburettor is really too small for the 1600cc engine. This is a popular replacement carburetor for VW Beetle, Bus, … This can be a problem when a generator is replaced with an alternator in a pre-1973 car. Complete kit features Empi EPC 32/36F carburetor with electric choke, manifold, chrome air cleaner, filter element, fuel line, hardware and... A synchronous 38mm 2 barrel carburetor perched on an isolated center section aluminum intake manifold featuring a pre heat system and and electric choke. (To clarify: In the single-port design the port splits INSIDE
EMPI 34 PICT-3 Carburetor. This Deluxe kit comes complete with offset manifolds that have plenty of material for extra porting. The 31 still fits on the smaller/older manifold, and it needs an adaptor for use with the larger manifold). Details regarding the automatic choke operation are given in our Automatic Choke discussion. twin-port (dual-port) heads have two holes in the cylinder head,
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. 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 original throttle shaft bushings are "garlock" split style bushings made of relatively soft aluminum, which wears after a short while and permits air to leak in around the throttle shaft, essentially making the carburetor useless. Air Cleaner
Rob responded - Well, yes, that's sort of right. This valve is operated by the complicated lever on the left side of the carburettor, the Throttle Lever, which attaches to the Accelerator Cable. But before you actually tackle the syncronization, remove the air … Adjustment of "Double-Screw" Carburettors
Kits are mated to a specifically designed and race proven isolated runner manifold. 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. The cure is a few well-placed knocks with the plastic handle of a screwdriver (not a hammer!) which splits right and left and carries the fuel/air mixture from
For more information, please see Alternator/Accelerator Pump Linkage Interference. What this means is that you can have correct metering at some engine speeds but not at others. Available with 40 and 44 HPMX carburetors. This valve shuts off the flow of fuel when you turn off the engine, to prevent "running on." 34 PICT/3 Carburettor Overhaul, Related Topics
The larger the capacity, the higher the airspeed through the carb and so the leaner it will run. Aircooled.Net offers the finest carburetor setup for all your new Weber Carburetors purchased from us. Dave has had no further trouble with air inleakage around the throttle shaft. Vapor Lock
Off-Road. Using this excellent carburetor on 6V systems will result in slightly longer warm up times. (In alphabetical order), Accelerator
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). VW Air Cooled. Carburettor/Distributor
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). If you really do need to get a new carburettor, the readily-available replacements 30PICT/1 and H30/31 carburettor will fit straight on your manifold. 356 / 912 Porsche Solex 40P11 to HPMX/IDF Carburetor … 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'. Choose... New Amp Ultra Dual HPMX carb kits with new offset manifold, combo linkage and air cleaners. Or, if working by myself, I find that I can come very close by adjusting the cable as follows: With the idle screw against the very bottom of the stepped cam, pull the cable back finger-tight and snug down the screw to secure the cable. The 30PICT Carburetor can be used as a replacement but has a slip on fuel inlet and a 12 volt choke. It directs fuel into the bowl of the carburettor through a Float Needle Valve (inside the carburettor bowl -- you can't see it without taking the top of the carburettor off). 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 nut is removed to provide access to the Main Jet which sits horizontally in the bottom of the float bowl. 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