So I'm doing some number crunching for my upcoming 446 cid engine build. I'd like to be able to cruise with 89-91 octane gas. Thant being said I was using the Wallace Dynamic compression calculator. My proposed set up was
4.35 bore
3.75 stroke
6.76 rod
9.25:1
78cc chamber
.04 head gasket
1000 ft alt.
result:
Static compression ratio of 9.25:1.
Effective stroke is 3.55 inches.
Your dynamic compression ratio is 8.61:1 .
Your dynamic cranking pressure is 174.81 PSI.
Your effective boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.61 :1.
I have read that for 91 oct I should keep it under 170. I'm trying to use the best piston, head to get the best quench possible to help. Do you guys feel this would be to much ?
I know the cam can make a huge difference.
- - - Updated - - -
I'm trying to obtain 550-575 hp. So pushing it a bit.
4.35 bore
3.75 stroke
6.76 rod
9.25:1
78cc chamber
.04 head gasket
1000 ft alt.
result:
Static compression ratio of 9.25:1.
Effective stroke is 3.55 inches.
Your dynamic compression ratio is 8.61:1 .
Your dynamic cranking pressure is 174.81 PSI.
Your effective boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.61 :1.
I have read that for 91 oct I should keep it under 170. I'm trying to use the best piston, head to get the best quench possible to help. Do you guys feel this would be to much ?
I know the cam can make a huge difference.
- - - Updated - - -
I'm trying to obtain 550-575 hp. So pushing it a bit.