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Piston clearance

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Piston clearance

Post  Paul 638 on Wed Mar 15, 2017 7:51 pm

I am about to get my 199cc AMC 20T barrel rebored to suit a new +15 thou piston, can any body advise what clearance it should have after the rebore?

Regards Paul.

Paul 638

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Piston clearance

Post  piston 197 on Wed Mar 15, 2017 8:46 pm

It will be a genuine Hepolite or wellworthy piston as no one makes a replica, these pistons come already toleranced, ie STD bore size is 59mm, so new 2.3228", so bore should be bored to this size +015" (2.3378") +.001
=.000

Air cooled engines generally run .0015" per inch of bore size, so if you measure the piston at bottom of skirt at 90Deg. to the pin it should be the necessary amount smaller than 2.3378" i.e the clearance required for your particular engine

JH
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Re: Piston clearance

Post  Paul 638 on Wed Mar 15, 2017 9:05 pm

Thanks JH much appreciated.

Paul.

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Re: Piston clearance

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