piston clearance in bore?
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piston clearance in bore?
racinghabbit April 23rd 2013, 12:18 pm
I know that .004 is normal bore clearance,
But, I have a motor with 4.390 pistons and it has file fit rings. All out race only engine... 12.50:1 compression
Will it be ok with .007 to .008 piston clearance?????
what do you guys think, Thanks
But, I have a motor with 4.390 pistons and it has file fit rings. All out race only engine... 12.50:1 compression
Will it be ok with .007 to .008 piston clearance?????
what do you guys think, Thanks
racinghabbit- Posts : 575
Join date : 2011-07-12
Re: piston clearance in bore?
dfree383 April 23rd 2013, 12:29 pm
loose is fast ! as long as its a race engine and they are forged it will work.
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Re: piston clearance in bore?
bbf-falcon April 23rd 2013, 2:48 pm
Until you reach "excessive" loose is better than tight imo. 
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Re: piston clearance in bore?
res0rli9 April 23rd 2013, 8:00 pm
Hell I use to run .010 back in the day but they have better pistons now. run it 
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racinghabbit- Posts : 575
Join date : 2011-07-12
Re: piston clearance in bore?
69F100 April 24th 2013, 12:09 am
My 460 I had in my Ranger I ran them loose it needs boring but I put a new set of cheapo speed pro flat tops in it and bought a set of over sized ring and cut them to fit and ran it turning it 6500 rpm.
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