quote:Originally posted by JFB #05177:quote:Originally posted by PanteraDoug:
.. for something like a .035+ clearance.
Everyone is building these engines tighter now. .015 to .020 is what I would expect to see. MAYBE .025 ...
please excuse my ignorance. are those clearnances in mm?
Inches. They are so small that you need to measure them with Plastic-gauge.
You place the plastic-gauge under the bearing, torque the cap, then take it off and compare the squashed material to a paper chart that the stuff comes wrapped in.
If you read some old (1970 +/-) magazine articles about building race engines, you might see recommendations of .035" clearances on the main bearings.
There you need a thick single grade oil. Maybe a 50 weight?