Desk Top Dyno

RustyRatRod said

I'm no head porter and know little about porting and flow but I have a question. Let's say you have a camshaft with .640 lift. WHY do flow numbers at say .300 even matter? Help me understand.

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In addition…. The fatter the flow curve the better the power return. On high performance and race cams, the goal is to lift the valve as high as the head can flow the air and let it sit there while the engine is going down the air. The better the low lift is the better the cylinder fills not just at the low lift points but it helps move more air and fuel sooner and hopefully a good ramming effect dynamic is also taking place with more air and fuel being drawn in with a larger amount sooner.

Most head porters and racers will seek this because they know this will add power from the fatter air and fuel curve it brings in. Some will say it’s really not a whole lot and there is a certain amount of truth to it but it is that stack up the little things and add them up deal. The cylinder heads ability to move air is a known super key area and the sooner you move more air and fuel the merrier it will be.