Testing Demon Carburetors on a Small Block Chevy - Size Matters
3. The venturi and booster design is what primarily influences how much fuel is drawn from the main jets inside into the engine. The larger the venturi diameter,the slower the speed of the air that's running through it into the engine. The slower air speed alters the pressure differential between the vacuum beneath the booster and the pressure above it. This is why slapping a large-cfm carburetor onto a small-displacement engine doesn't work. The engine doesn't create enough air speed through the venturi to draw the proper amount of fuel relative to the incoming volume of air, and so the engine runs lean. View Related Article
|
|