RPM – What does it really mean?

Hi Guys,

I have been laying low for a while, I have been thinking and thought would start a debate over RPM range, when you buy an intake it is rated from idle to 5500 eg performer, then the performer rpm 1500 to 6500 and cams are rated something similar.

Lets start with intakes - What's this RPM figure mean, if we look at cams we can say at 50thou its 224 degrees, so now I know that every cam is based to that spec, but how is the RPMs worked out on a manifold, lets use performer, at 5500...

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Author: Bruceynz