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Hi Steve, thanks. We are using a snap on torque wrench which was calibrated last month. The tightening sequence was 11, 17, 23ft-lbs. When we tightened to 8ft-lbs, ovality went to just under one thou.
We set up a cylinder and head on a half case and tightened it down. While we could not measure ovality due to the case webbing, the distortion seemed to be slightly less judging by what measurements we could take.
Here is a dumb question; is 23ft-lbs always 23ft-lbs? By that I mean does it make a difference if you are squeezing the cylinder with a steel plate versus an aluminum head?
Also, is it possible the cylinders have somehow become seasoned after decades of heat cycling, leading to more susceptibility to distortion?
Thanks again,
Gunther
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