10.8:1 cr too much for pump gas?
Is 10.8:1 compression ratio too much for 93 octane? This would be on a carbed 350 using 72 cc aluminum heads and speed pro hypereutectic domed pistons. Also what 72 cc alum. heads would you recomend for a 400 hp 350?
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10.8:1 is too much for pump gas.
You really start to push into the limits of 93 octane at 9.75-10:1 with aluminum heads. People have gone higher, sometimes it's luck and usually it's a lot of math and experience. |
realy? I think i would be ok because i am runing 10.2:1 now on iron heads with out a problem.
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11.5:1 runs fines on pump gas. (sonoco 94) but im sure 93 would be fine too. but if you are planning on spraying i would toss some 110 in it or somthing so u dont detonate.
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my ls1 has 10.1 to 1 factory so 10.8 should be no problem. definitly go with high octane (93 or 94) if available
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I don't know if the alum. heads will make a difference but I'm running about 11:1 with Iron heads right now. Runs fine on 93.
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Originally posted by Bcooper13 I'm running about 11:1 with Iron heads right now. Runs fine on 93. |
How big of a cam are you guys running? You can run higher CRs with a pretty lumpy cam [more duration] because it bleeds off some cylinder pressure.
I guess I should stop reading magazines and the internet and start building motors! :bow: |
I run 11:1 with Dart Iron Eagle heads, 36 deg. total timing, Comp cams 284 XE cam, and a 3500 stall converter. Car runs on 93 octane and was a daily driver for 3 years until I was able to get a beater(87 S10). Never had any detonation. I even ran a 150 shot without adding race gas or timing retard and never gave me any problems. Every car is differant but, I think with 10.8:1 and aluminum heads you will be fine.
How big of a cam are you guys running? You can run higher CRs with a pretty lumpy cam [more duration] because it bleeds off some cylinder pressure |
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