Thread: Blower carbs

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If they are double pumps then there is no 'boost referancing'; what you might want to do, or be aware of, is that i have best luck making them pig rich at idle. If you have replaceable idle air restrictors then drop them to about a 68 or so, i keep riching the idle circuit until it affects the plugs and lean it from there. Do it like this and you'll be able to go from light to light without engine getting too hot.

So pretty much youd rather have the carbs rich than lean? I am running a freshend up Vertex Mag.

Originally Posted by PRO53

So pretty much youd rather have the carbs rich than lean? I am running a freshend up Vertex Mag.

A lean condition can quickly spell death to a supercharged engine. Very ugly--melted pistons, etc.

Blower motors make a lot of heat, the carbs are your friends and can help you deal with it. I make the idle ckt extra rich, the idle ckt runs constantly so you can cut back on the main jet to compensate for the fat idle, doing that when you are cruising the fuel won't be excessive. Pig rich at idle will let you go from traffic lite to lite and creep in line without overheating.
I set up a '32 with a blown BBC and i've never seen it go over 180 deg.
I do like them blower motors.