HKS SRI Intake Kit

[invader166]

Originally Posted by alias06

The most air that you can suck into the engine N/A is just what the engine is willing to take in the amount of time it can when the valves are open. Mathematically the theoretical amount of efficiency you can get is 100% which could theoretically be obtained by a stroker kit and free flowing intake/exhaust tuned to a desired RPM.

Realistically without F/I you will never break the 100% volumetric efficiency or even come close.

I respectfully disagree on that.

You are correct in saying that the theoretical amount of air that can be drawn in the engine is 100%. But, that's only THEORETICAL! In reality it's probably more along the lines of 80%-85%, but that's besides the point.

On a naturally aspirated engine, with a well designed induction system, you can definitly break that 100% mark without forced induction, using a process called pressure wave tuning. Definitly look it up if you don't believe me. I'm not making this up.

[alias06]

Originally Posted by invader166

I respectfully disagree on that.

You are correct in saying that the theoretical amount of air that can be drawn in the engine is 100%. But, that's only THEORETICAL! In reality it's probably more along the lines of 80%-85%, but that's besides the point.

On a naturally aspirated engine, with a well designed induction system, you can definitly break that 100% mark without forced induction, using a process called pressure wave tuning. Definitly look it up if you don't believe me. I'm not making this up.

I am not sure what you are trying to disagree with here. I said theoretical, not practical. Yes in reality your engine is only 80-85% as effective sucking in air without any other factors.

You must also skipped over the part where I said "tuning for a certain RPM" even with pressure wave tuning it is only tuned for a specific RPM that is why there are different length headers which move the powerband up or down depending on the design. The engine itself can't achieve 100% VE at all RPMs, it can be considered a narrow powerband when compared to a FI engine where a compressor is used to force air in and increase VE of the cylinders.