IMM Engines 408 build

nm9stheham said

Keep us posted.... (BTW, the Wallace DCR calculator computes cranking pressure, not V/P index.)

Sounds like your new cam duration is a lot shorter if the cranking pressure is going up that much.

Click to expand...

The duration is more on the new cam but the LSA went from 112 to 108... this might have something to do with it. Old duration was 226 the new is 230... not that much difference but....

It actually calculates both... here is a example .. the V/P is at the bottom

Static compression ratio of 9.7:1.
Effective stroke is 3.15 inches.
Your dynamic compression ratio is 7.85:1 .
Your dynamic cranking pressure is 151.86 PSI.
Your effective boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of PSI is 7.69 :1.
V/P (Volume to Pressure Index) is 146