Quote:
Originally Posted by bobcowan
When the engine is built, the bearing clearances are set either "loose" or "tight". A lot of race engines are built loose, supposedly making a little extra power while sacrificing bearing wear.
|
It's not a power thing....
Drag race engine are built "loose" because of the engine temperatures when the cars are staged and launched.
Road race engines do not run "loose" clearances. In fact, you will find a lot of Cup engines with 1.880" rod journals, small wrist pins, 302 mains, etc., run bearing clearances at or under .002".
It's a function of journal diameter and application.