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helms time. di ni na nah. helms time. .002in measured with feeler gauge. piston installed. distance of piston to cylinder wall.

or when measuring cylinder bore size there should be no more than .05mm (.002in) beyond/bigger than the standard bore.
 

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there is a party in my pants and Lindsay Lohan is
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Discussion Starter #3
oops- missed the update to this...

i was just wondering cause there seems to be a pretty big gap between standard bore serviceable range (75.000mm-75.020mm) and 0.25 oversize (75.250mm-75.270mm)...

wondering how critical staying within the 0.020mm for standard bore is or if you can stretch it a few more thousandths if you were in kindof a squeeze.
Slightly oversize rings maybe?
Haven't built alot of motors myself yet...
 
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the problem is that a lot is riding on the alloy you choose for the pistons. some alloys will need loads of clearance when they are cold but will handle heat better while others can take less heat but are tight all the time and therefore, quiet. Then there is the question of the rings as some rings will expand more than others. The Arias and JE websites have some quick and simple overviews of the alloys and their applications.
 
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