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octane and compression...?

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Author	Topic: octane and compression...?
MDF99 Gearhead Posts: 201 From: Hamilton, Ohio, USA Registered: May 2001	posted 11-19-2001 01:29 PM With 93 or 94 octane pump gas, what's the highest compression ratio that you can comfortably use? IP: Logged
steve'66 Gearhead Posts: 6602 From: Sonoma,CA,USA Registered: Mar 2000	posted 11-19-2001 02:14 PM Depends on Cam specs, timing, type of head, etc. But a general guideline is 10-1 with cast iron heads and 10.5-1 with aluminum heads. The wilder the cam the higher compression you can run. SteveW IP: Logged
Mpcoluv Gearhead Posts: 975 From: Charlotte NC usa Registered: Apr 2001	posted 11-19-2001 02:38 PM I'm barely able to run 10.4:1 with my 372C with quench 4V heads. If I had it to do over, I'd stick with 10.00:1. Aluminum heads allow for 1/2 to 1 full point more of compression. IP: Logged
JAAZZY Gearhead Posts: 745 From: Bay Area, CA Registered: Apr 2001	posted 11-19-2001 04:00 PM I'm running 10.5-1 with aluminum heads with no problems on 91 octane. I think I could easily run 11-1 on 93. IP: Logged

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