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Ooooh, TIGHT! 1800

posted by  mjamgb on  Tue Nov 23 09:11 CST 2004
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last visit: Tue Sep 4 14:53 CST 2012
[RELATED]

Amen to that.

I did a quickie thermo-mechanical analysis on a theroetical engine with 3" bore, 5.5" stroke, Skirt clearance of 0.005", Main bearing clearance of 0.0015" and wrist pin clearance of 0.0005".
I assumed that the DeltaT of the engine was about 300 degree F and the piston body remained "cool" and the rod correspondingly "hot." Steel rods.

I came up with a contact distance (absolute minimum clearance) of about 0.0210" When you toss in wear limits and a FOS I get closer to 0.032" (and that's if I am very careful about wear!).

I hear the Honda-boys go 0.030" routinely, USA V-8's are 0.060" factory and 0.040" "hot-rod".

Mike!
--
Mike!






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