351 piston rings

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#11

04-19-2012, 12:02 AM

wildcard

Senior Member

1st Gear Member

Join Date: Jul 2010

Location: Missouri

Posts: 1,414

Quote:

Originally Posted by TNC

I'm too lazy to go back and research this, but if I recall a 2-stroke "must not" allow the ring gaps to move as the end gaps could hang on a port in the cylinder. 4-stroke rings do move around in the cylinder...generally.

exactly my point. If the rings didn't move there would be no need to pin them into place as you do in a two stroke. in a 4 stroke they are free to rotate as there isn't any ports in the cylinder for the ring to hang on.