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Originally Posted by C1ay
Changing the mixture on a carburetor does not change the displacement of the engine, it will still pull in a fixed quantity of air/fuel mixture. .
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This is certainly true C1ay, but only if both examples are feed with the same cylinder head. I own a flow bench which I have used to flow test the volumetric efficency of the cylinder heads on my race car. Over the last year or so I have spent many hours porting these heads in an effort to increase the power output of this engine. As a result, I have seen an increase from 560 to about 650 horsepower. This increase is attained, not by raising the overall cubic inch displacement of the engine, but, by allowing the air fuel mixture to more freely enter the combustion chamber of the motor. By increasing the velocity and volume of air fuel mixture entering the chamber, through cam timing and intake port efficiency, a much greater volume of air fuel mixture is placed within the cylinder for ignition. As any good physicist knows, atmospheric pressure is responsible for the flow of air from ambient pressure to an evacuated chamber. The ease and speed with which this can occur will result in a greater volume filling the cylinder. Upon ignition, greater cylinder pressure is obtained raising the power output of the engine.
