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Old 01-04-2009 | 01:57 AM
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DarZeelon
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From: Rosh-HaAyin, ISRAEL
Default RE: Piston Ring End Gap

ORIGINAL: Charley


ORIGINAL: Ram Jet

I need a-little advice. I've written enya-engine.com twice and didn't get my usual immediate response from Ken Enya. I just bought and rebuilt an Enya .46-4C. The ring endgap is .011" or .279mm. It seems excessive to me. Any guesses as to what is acceptable? In addition, does anyone know the where abouts of a gentleman that specializes in piston ring sales and, I think, manufacture that is mentioned many times in posts here.

Thanks,
Bill
Is it a pinned ring? If so, deduct the diameter of the pin.
Wrong, Charley!

The pin does not protrude fully through the ring...
The ring ends can touch each other, over, under, or outside the ring...

The first photo is from Wiki, shows a pin protruding into the upper part of the middle ring.

The other two from Tower show the OS ring, which closes over (outside) the pin and the Super Tigre ring, which has the pin 'cavity' completely outside the ring-gap...



As to the actual gap, Bill; Jim is right and it should be about 4 thousands per inch of piston diameter.

With the Enya .46 having a bore of under 1", the ring you have should have a gap of about .004".
So yes, it does seem excessive.


Talk with Frank Bowman. He's very helpful; even on the phone.
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