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Old 01-17-2004, 11:55 AM
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piston clearance

My question is when rebuilding an engine what is the rule of thumb (spec) for the space between the actual piston and the blocks cylinder wall? Also some suggestions on selecting the right piston rings size. Thanks for the help.

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Old 01-17-2004, 12:27 PM
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Off the top of my head (just like my hair....lol), I seem to remember, piston clearence should be .0025 to .005 in.

You buy your rings by the size of the cylinder. Measure it accurately to determine if it is overbored.
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Old 01-17-2004, 12:48 PM
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Piston to wall clearance depends on the specific piston selected. Most of the new hyperutectic pistons call for .001 to .0015! Pretty close tolerances. Check with the piston supplier and who ever is doing your machine work.

Mark
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Old 01-17-2004, 01:08 PM
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Thats right,depending on the grade of aluminum and how much of it there is to expand,it will grow at different rates,forged pistons usually require more clearance.
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