Well Jerry that's just about exactly the way I’ve done it in the past and the way I’m checking this one. That is, using the 3" mic, bore gauge and indicator to check the crank clearance.
But my question really was why you never see a detailed explanation of just how they design the measurement or calculate the calibration. There is a formula on the Plastigauge site but I haven’t tried to dissect it, I never was much of a math wizard.
I have to assume that Sealed Power has calibrated Plastigauge taking into consideration that all of the clearance will be read off of one side of the bearing surface. In other words in the example I posted the nominal .002” oil clearance when every thing is torqued down will in reality be .004” where the Plastigauge strip is placed. And the paper gauge strip is calibrated to give you a reading half that amount. That is the only thing that seems to make any sense.
And Jon, I didn't actually mean that one would place plastigauge at 90°, I just meant theoreticly that would be the only way to find the true symetrical oil clearance.
Denny Graham
Sandwich, IL
Last edited by Denny Graham; 03/08/2010 9:31 PM.
