ORIGINAL: Rcpilot
Typical ring gap is about .003 or .005 thousandths. I know that works on engines up to about 60cc. Larger engines may have more or less gap. I don't know.
Pat is right though. Ring gap on an industrial engine is the same as an aero engine of same displacement. Bearing clearances are the same too.
Bacon grease!!
I talked with a well know piston ring maker. He said most small engines the cylinder/sleeve will expand more than the ring. Thus you can use .001 for end gap for the piston ring. He has set up many and never seen a problem. Just a obsevation I wanted t pass on. Capt,n