 What compression ratio should I aim for? |
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| tornik550 |
 Sep 30 2010, 07:22 PM
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
If one was building an engine that was to be used for AutoX and occasional street driving, what would be the best compression ratio? I live in Ohio where 93 octane is readily available.
Crank- 78mm stroke Cylinders-96mm bore Pistons- Flat top Combustion Chamber- All are exactly 59cc (I just double checked) Deck Height- ???????????? Side note- The heads that I was previously using turned out to be complete crap. I told my neighbor who recently purchased a 911sc. He said "I have a beautiful set of heads I was going to put on my 914 but I sold the car before I had a chance". He gave them to me for free. The are freshly rebuilt 1.8 (1.7?) heads ported with 42/36 valves. Had my local Porsche expert take a look and he said they look great- especially for the price. Lucky! |
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| VaccaRabite |
Sep 30 2010, 09:05 PM
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En Garde! Group: Admin Posts: 13,445 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
9:1 is what I would shoot for. Would require you to use high grade gas all the time though.
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