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Post by 47x on May 8, 2012 18:16:05 GMT 1
hi all,i want to raise the compression ratio on my valve motor,how much should be skimmed of the head??whats the highest i can go on pump fuel before it starts to detonate??thanks ;D p.s.its a stock motor,stock airbox,stock pipes(f2).i done it to a l.c. years ago,and got good results ;D has anyone done this to a valve?
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Post by rdstars on May 8, 2012 19:41:19 GMT 1
Every Valve engine is different and it also depends on what base gaskets you use.
Anyway back to basics:
You got to measure your squish then you can determain how much it needs to come down. I've measured the squish to be anywhere between 1.9 & 2.2mm and ideal would be under 1mm but not lower than 0.8mm.
Base gaskets from gen to patten are different thickness and also you need to work out what your doing about your head gasket.
so as you can see it is not quite as simple as how much can I skim.
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Post by 47x on May 8, 2012 20:19:27 GMT 1
the standard compression ratio is only about 6.0 which is low,like i said i done a lc one before and had good results ,taking about o.6 mil off,just wondered if anyone had done a f2.but i know gaskets have some bearing on final results.they are all genuine gaskets
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Post by rich on May 8, 2012 20:54:15 GMT 1
I reckon 1mm is about the minimum you want for the road. My engine measures about 1.2mm. The head has been skimmed and I run 1 layer of a metal head gasket.
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Post by 47x on May 8, 2012 22:56:25 GMT 1
nice 1 rich,that is what i was thinking.thanks m8.richy
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