CARBURETOR CLASS: The Hows and Whys of Secondaries

Today we’re talking secondaries. Why we have them, how they …

Today we’re talking secondaries. Why we have them, how they operate, and how to choose the right style for your ride. Most fuel injection systems use one giant butterfly valve to gate incoming intake charge, so why don’t carburetors?     (Read More..)

Solve Idle Dilemmas Without Misusing Throttle Plates

If you have an engine that’s a heavy breather at …

If you have an engine that’s a heavy breather at idle because of a large camshaft or engine displacement, chances are you’ve come face to face with an idle adjustment issue. To keep the idle up, one might crank the primary throttle plates open to c (Read More..)

Carburetor Class: Methanol in Drag Racing

  In order to be a successful bracket racer you …

  In order to be a successful bracket racer you need to be consistent. When .001 of a second matters any edge you have is valuable. One way to make your car considerably more consistent is to use methanol instead of gasoline. Methanol is the molec (Read More..)

The Four-Barrel Chronicles

The Final Chapter

Idle Circuit Function and Calibration Functionally, the idle circuit is very similar to the main metering system and may be thought of as a main system for low-speed use. Under normal circumstances, idle flow begins when manifold vacuum acts on the cu (Read More..)