05-06-2020, 11:27 AM
(This post was last modified: 05-06-2020, 11:32 AM by Bob Culver.)
According to various books the oil film is just a few .0001 inch thick, spot pressure in a modern may be 20 tons square inch, down and up, and temp 30 C deg higher than sump. The heat is generated by the severe shearing and the power absorbed. Nearly all is carried away by the oil. (I have encountered cars with cigarette papers behind the shells and which have operated OK) You can easily work out the sliding velocity, high on revving moderns with large dia bearings.
A lot of engine heat is picked up by the oil, esp from underside of piston, and head under ohv gear. I gather many motorbikes rely heavily on a flood of oil for engine cooling.
A lot of engine heat is picked up by the oil, esp from underside of piston, and head under ohv gear. I gather many motorbikes rely heavily on a flood of oil for engine cooling.