Quote:
Originally Posted by mrg666
Did you read what you wrote? Cylinder pressure is strongly affected by boost (along with ignition timing, exhaust system, compression, ...) and unit of boost is psi which happens to be a pressure unit. Boost is not a concept, it is a measured engine variable, go ahead put a gauge in your car ... it is also available with a cheap OBDII device. There is a MAP sensor to measure that "vague concept".
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Yes, I read what you wrote. Intake air pressure is not the same as the amount of oxygen entering the cylinder. A better flowing header will reduce PSI for the same amount of oxygen entering the cylinder. Oxygen and gasoline combusting is what makes cylinder pressure, not PSI of the incoming air. Are you mixing up intake PSI for the actual amount of oxygen?