built motors - out of round - taper
07-23-2009, 10:07 AM
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built motors - out of round - taper
Factory limits / service limits for a b18b1 are .0002 / .0004 on a stock motor. Stock motors also ask for a .0004-.0016 piston to wall clearance.
On a built motor (84mm), with about a .0040 ptw clearance, are bigger tolerances ok as far as out of round and taper? My biggest difference in taper and out of round is about .0003 in a couple places. I am going to get a better dial bore gauge to see if I can get any clearer readings.
And does anyone know a good place to buy a mitutoyo bore gauge?
On a built motor (84mm), with about a .0040 ptw clearance, are bigger tolerances ok as far as out of round and taper? My biggest difference in taper and out of round is about .0003 in a couple places. I am going to get a better dial bore gauge to see if I can get any clearer readings.
And does anyone know a good place to buy a mitutoyo bore gauge?
07-23-2009, 03:46 PM
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Re: built motors - out of round - taper
NO, you always want your bores to be as round as possible no matter stock or after market pistons. The straighter the wall, more better the rings will seal.
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