The Rochester BV carburetor is a one barrel downdraft carburetor with a divorced choke. Divorced meaning the choke thermostat is mounted in the manifold, connected to the carburetor with a choke rod. Adjustments Idle Speed & Idle Mixture Turn the idle mixture screw in (clockwise) until seated, lightly. Scoring of…
Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Purpose of the Carburetor The carburetor delivers a combustible mixture of fuel and air to the intake manifold of the engine. It automatically controls the amount of fuel being mixed with the air to meet changing engine operating…
When I’m rebuilding my carburetors, I will usually test the accelerator pump circuit before closing up the float bowl. The Holley 94 carburetor uses a check ball in the accelerator pump well and I want to make sure it doesn’t need seating. 1st, you need to know why the check…
I get a lot of questions about the AFB and how the jets and metering rods are related, so here we go. The AFB, 4 barrel carburetor has 4 jets. Two matching primary and two matching secondaries. The Weber marine carburetor is an exception to this. On that carburetor the…
Stromberg WW carburetors are notorious for having worn throttle shafts. Unfortunately unlike most carburetors, the WW wears out the shaft instead of the throttle body. As I mentioned, most carburetors wear the throttle body and while not a simple process, re-bushing the throttle body on these carburetors is very doable…
The Holley 1931 carburetor is a one barrel downflow type of carburetor. The carburetor is a one piece main body and throttle body casting. The 1969 model had limiter caps installed over the idle mixture screws so that they weren’t tampered with. These can be removed, although I’m not sure…
The Holley 1904 is a 1 barrel, downdraft carburetor and has three basic parts, the main body, throttle body and the float bowl. The main body includes the metering block, float and the economizer. The float bowl mounts on the front of the carburetor and can be metal, or glass. The glass bowl is…
Basic Purpose – When the engine is cold the choke valve is fully closed (some may have a small gap). This allows the engine to get that extra fuel it needs to get going. When the engine starts vacuum is applied to the choke pull-off which will retract, opening the…
This question was recently asked by one of our customers. 1967 GTX, 4127s have been into this card 50 times. Can not get why the accel’ pump won’t work until half throttle. It seems it’s in the body. I have three 4127s, the other two work. All adjustments are spot…
Carter WCFB Vacuum Piston. It isn’t unusual for the vacuum piston on the WCFB to become frozen in the cylinder where it resides. Be careful when removing the top of the carburetor that you don’t force things and break the piston lever. When the piston is frozen you may have…