Thread: Dynamic compression ratio
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09-17-2004 08:33 PM #1
CHR Member
- Join Date
- 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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Thanks guys! One more trip around the sun completed. Lots of blessings and things to be thankful for (like still being able to type this message!!) Here's to us "over 70 guys.." Glenn
HBD Glenn!!