Thread: Dynamic compression ratio
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09-17-2004 08:33 PM #1
CHR Member
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- Jan 2004
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- 30min SouthSouthEast of Sarnia
- Car Year, Make, Model: 86 GMC Sierra Classic
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Dynamic compression ratio
Whats the max Dynamic compression ratio that will run on 87 octain fuel?
7.25:1DCR or 7.5:1DCRhad a rebuilt 355SB chevy
it lasted 42,000km
Got another rebuilt 355SB
it lasted 62km.
I still have not had a powerful engine.
slowly building a quicker truck
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09-18-2004 07:41 AM #2
CHR Member
- Join Date
- Jan 2004
- Location
- 30min SouthSouthEast of Sarnia
- Car Year, Make, Model: 86 GMC Sierra Classic
- Posts
- 78
So I will just have to guess how to up my cranking compression up to 180psi.
right now its like 160psi/7:1DCR (8.5:1scr with a 62*IVC)
9.4:1scr with .040 quench and the same cam. should run on 87 octian. (72cc fastburn chambers)
running on the low end of the coolant heat range.had a rebuilt 355SB chevy
it lasted 42,000km
Got another rebuilt 355SB
it lasted 62km.
I still have not had a powerful engine.
slowly building a quicker truck
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Thank you Roger. .
Another little bird