10.8:1 cr too much for pump gas?
#1
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?
Last edited by zx1216; 05-31-2003 at 08:14 PM.
#2
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.
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.
#7
Originally posted by Bcooper13
I'm running about 11:1 with Iron heads right now. Runs fine on 93.
I'm running about 11:1 with Iron heads right now. Runs fine on 93.
#8
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!
I guess I should stop reading magazines and the internet and start building motors!
#9
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.
I think a loose torque converter helps also. I remember an article in HotRod awhile back about a guy who ran a 14:1 sbc on 93 octane. Said he was able to do this because of the Nova's light weight, cam with ALOT of duration, timing was like 28 deg. I think and a very loose converter. Car ran consitant 10.80's on motor. I would never try this but, like I said every car is differant.
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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