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Anything to heads but flow numbers?
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[QUOTE]Originally posted by 93PONY: [QB] [QUOTE]Originally posted by st5150: [qb] [QUOTE]Originally posted by shade-tree: [qb]velocity, CC volume, runner volume, valve angle (inline, twisted,etc.)[/qb][/QUOTE]You listed the same thing here twice ;) Smaller runner volume gives you higher velocity. Put it this way, on a boosted car, flow is pretty much all you care about since you're making your own velocity. On a NA car, you want the highest flowing heads for a given runner volume. For example, a head that flows 300 cfm on the intake side with 240cc runners is not very efficient. A 205cc runner volume head that flows 300cfm is efficient. In short, flow numbers [i]with respect to runner volume[/i] are everything.[/qb][/QUOTE]Wow! Right on Sawson! This is one of your best technical posts IMO! Let me just throw out one more thing.... Cross-section of the port also matters. This ties in with velocity. EI, a smaller cross-section port that flows 300cfm is more efficient then a larger cross-section port that flows 300cfm. Even if the CC volume is the same. [/QB][/QUOTE]
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