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Old 07-25-2010, 12:05 AM   #9
paulb
 
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Name: paulb
Title: Too Much Time
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Join Date: Jul 2006
Location: Klamath Falls, OR
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Quote:
Originally Posted by Farmallgray View Post
So these figures are what you use for a 4.02" bore, correct? So I should calculate a percentage of those for mine, right? My bore is right around 3" so if I multiply those figures by .75 then it should be eqivilant for my application.
You would probably be pretty close on the end gaps doing that, but not on the piston clearance. If your pistons are of a similar construction and material to the Cummins pistons, then you should use the above mentioned spec. The bore size won't have that much effect on piston clearance. At least the difference that we are talking about. If your pistons are forged, you would want to go looser. If they have expansion control built into the pistons (typically metal rings cast into the piston), you could go tighter. Sorry if I'm sounding vague.

Paul
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