Quote:

Pretty sure wallace uses .050 numbers it's the same as this

http://www.rbracing-rsr.com/comprAdvHD.htm

Static compression ratio of 9.35:1.
Effective stroke is 3.39 inches.
Your dynamic compression ratio is 8.57:1 .
Your dynamic cranking pressure is 173.77 PSI.
Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.57 :1.
V/P (Volume to Pressure Index) is 210

I have a detailed dyno program and it gives the same cranking compression!



Hmmm, Using that calculator, I got the same result as you, except as I understand it, you are supposed to add about 30* (which would make it 70* seated) to the Intake Closing to correct for the @.050 number because the chamber doesn't start building pressure until the valve is fully seated. Maybe that calculator automatically adjusts for that?

I used the one listed DCR Calculator with VB6 Runtime files at the bottom of the page on this site.

http://cochise.uia.net/pkelley2/DynamicCR.html

It calculates dynamic stroke length, cam timing / overlap and static and dynamic compression, but it uses seat to seat (advertised) timing, not @.050 specs. Maybe try that one and see what you think? I keep coming up with 7.054:1. This is very confusing.