Quote:
Originally Posted by Dimman
In automotive stuff in the US, cfm is almost always referenced against water. Heads will be something like 280 cfm @ 28"WC (water column), basically at 1psi. Some flowbenches use 10"WC (Superflow, I think), so you have to do your math to compare between them.
This is a better exhaust article, but still incomplete. For example, the wave returns 'AT REGULAR INTERVALS' as it is in the text is actually not correct. The return timing effects at low rpm and high rpm are different because the wave changes.
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I'll add what you think is needed..