Carb issue?
Advertised Duration (Int/Exh): 268/276; Duration @ .050 (Int/Exh): 226/234; Gross Valve Lift (Int/Exh): .494/.513; LSA/ICL: 110/106; Valve Lash (Int/Exh): Hyd/Hyd; RPM Range: 1800-6200; Includes: Cam & Lifters (#71977PR-16)
Ok hold on, did you not say 7177 cam? The Edelbrock site told me that 7177 was 308/318/112
I'm in trouble, aren't I,lol
Well that explains the discrepancy between the Wallace predicted pressure and your actual ncompression test numbers. I was wondering how we were gonna resolve that!
Static compression ratio of 10:1.
Ica of 60* @6900ft elevation
Effective stroke is 3.25 inches.
Your dynamic compression ratio is 8.31:1 .
Your dynamic cranking pressure is
135.34 PSI.
V/P (Volume to Pressure Index) is
135
This is closer to your 155psi compression gauge numbers. I still don't know what to make of the discrepancy. The only way I can make the Calculator spit out 155psi is by manipulating the elevation or the compression ratio. And for compression ratio, using your numbers , I get only 9.86, so there is no room for fudging that, leaving only altitude.
In any case
With the new Cam specs of 268/276/110 and 226/
[email protected]
I take back all the negativity I said about the previous cam and combo.
Your Ica is now 60*, right on the number I previously posted as the minimum.
This is a great cam-spec; I ran a similar Hughes cam in my 367, and at 11/1 it was a torque beast. I can only imagine what it would be like in a 410 at my elevation of 930ft.