what is the recommended ring gap

Top ring .003 to .008
Second ring .008 to .015

Preference is always on the lower side for top ring

Even with very accurate dyno's its hard to find any power difference with end gaps between .003 and .020 inches. It's a very small gap for leakage and things are happening very fast at 5000 to 8000 RPM. What's more important is that the cylinder wall is straight and round from top to bottom. Our internal spec for top to bottom, roundness and taper is .0002 inches max.

Steve
 
Good advice Steve.

Remember, these are not the old flatheads -- Having near 0 end gap on the top ring is not so critical on the ohv engines.
Second ring always more end gap than the top -- this helps deter top ring flutter.


--
Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cuts
www.CarlsonMotorsports.com
Celebrating 25 years of service to the karting industry
765-339-4407
bcarlson@CarlsonMotorsports.com
 
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