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Somender,

To let you know - John John (JJ) took Western Canadian Championship on 85 Yamaha with Somender's 5 groove set-up. Shaving head 10 thou out-performed 3 groove. Jet sizing way down - performance way up. 4 stroke Honda was hole shotting 90% of every race. Thank you very much for helping us out. Happy New Year & best wishes to you and yours. kp / whitecourt

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how much more compression??
Date: 2008/06/05 22:10	By: gregc	Status:
Karma: 0

I have a 540 big block chevy. It has/had 11.69:1 compression and has ran fantastic on pump gas (92 octane). I am able to run 9.7s consistantly in a 3400lbs 67 Camaro. It has Profiler heads with dome pistons (I'll post a picture up in the future).

Last fall, it dropped a valve and wiped out multiple pistons among other damage. I figured this is a good time to try out some grooves.

My question is, how much gain in compression have you found that you are able to achieve running the grooves. I know it will vary per engine and that it is "significant" but I am looking for some best guess averages here. I'd like to up my compression ratio since I have to replace the pistons anyways but I need to know your idea of "significant". Is a 1/2 point bump what you are talking about? Or more like 2 points? (13.5:1)

With E85 becoming available in our area for a cost less than pump gas and an octane rating near 105, I'm curious if I could get away with a compression bump to 13:1 or better using the higher octane fuel and grooves.

Thoughts??

-Greg

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