PRP Velocity Lessons

Hysteric said
Until you talk to some one who is a head porter and tells you he did a set of heads that only flow 215 cfm with tiny ports for a 450 ci Buick that runs 10.9s @ 3500 pounds. According to the Moroso slide rule that's 480hp with 215cfm of flow. 2.23 hp per cfm.

Yes that's impressive, but for the average dude meaningless, cause their not gonna be able to replicate it in anyway, I'm not an engine builder but I feel pretty confident that I could build a 1.8 to 1.9 hp per cfm engine, so I'd feel I need about 270 to 280 cfm head to make 480 hp, and try to make that with 10.5:1 cr and 240 ish cam. And if wanted to build for a similar rpm powerband and torque add about 50 cid to the build.

What's the main advantages of building a highly efficient engine?
Especially for the average guy?

Hysteric said
In my view trying to calculate intake port velocity is a waste of time as a flow bench is not a running engine.

Probably true to some extent, I guess you'd find the formulas and programs some of these builder useless/little value too?

Hysteric said
Maybe a better way to view the problem is how does too much port velocity manifest itself as a problem in a running engine?

And that would be?