Ring gap change for high performance

S

Sparked

New Member
#1
#1
I just built my second mini bike motor, this one being a predator 212 with 265 cam, 1.3 ratio rockers, billet flywheel and rod. My question is should I open the ring gap from stock and if so how much?
 
S

Sparked

New Member
#2
#2
I run between 4500 and 7000 for 10 min or more. I know I need to open the rings up I was just wondering if anyone had advice. Heres what I found on a car site: The recommendation would be a minimum top compression piston ring end gap of.0045 to .005 inches times the bore diameter. For a 4 inch bore, the ring end gap on the top ring should be increased to .018 to .020 inches. That for high performance.
 
You must log in or register to reply here.
Top