Greg wrote,
>What is an ideal piston to bore clearance, and a maximum acceptable
>clearance for .080" standard type pistons in a reasonably tuned (110hp)
>engine revving to 6500 (noise is not a worry).
Depends upon the type of piston that you are using.
Cast types tent to run tight, and forged tend to run looser.
When an internal strut is designed into the piston, they tend
to run very loose so as to provide for controlled expansion.
Clearances run from 2 to 6 thousanths, and are typically dictated
by the piston manufacturer.
Stock pistons are at the lower end of the chart.
The next issue as far as piston noise is concerned would be
pin thrust.
>Also, what would the ideal and max big end clearances be.
For race, 2 to 3 thousanths is typical.
For stock, 1 to 2 (1.5 typ).
the larger clearances like more oil pump volume.
Jarrid Gross
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