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about skim from the head
Posted: September 29th, 2015, 8:09 am
by some man
I have jeep wj 4.0 1999. How much(max) can I safely skim from the head?
Re: about skim from the head
Posted: September 29th, 2015, 11:32 am
by Russ Pottenger
Without hesitation I've removed up to .040
How small you trying to get your combustion chambers?
Re: about skim from the head
Posted: September 29th, 2015, 1:21 pm
by some man
thank you very much!
In general the purpose of this is approximately CR 10-10.5. How much skim from the head to do this (how small must be combustion chambers), I don't know, haven't touched a calculator. Maybe someone did something similar and there are already calculations?
Re: about skim from the head
Posted: September 29th, 2015, 3:18 pm
by Russ Pottenger
For every .005 to .006 you'll lose about 1 cc.
Am I correct to assume that your engine is totally stock?
If so you realize you're not going to be able to run pump gas?
Re: about skim from the head
Posted: September 29th, 2015, 3:28 pm
by some man
Yes stock.
Sorry for my English, what do you mean " to run pump gas" ?
( If you mean octane, now i run on 93 octane. It should be enough that no detonation. Then I plan to install a custom engine control unit. )