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-   -   Lapping piston rings (https://classracer.com/classforum/showthread.php?t=60903)

George Wright 01-18-2016 10:09 PM
Re: Lapping piston rings
 
2 Attachment(s)
I had this tool made up about 25 years ago. It is for a 4.060 bore. On one side there is a dish cut in it that allows you to hold a ring inside of it. The ridge is about .025 tall so that the ring is exposed. I can then use this fixture to sand down the ring on a piece of fine paper taped to a piece of glass. The other side of this ring fixture is used for squaring rings in bores when checking / setting the ring end gaps.

Alan Roehrich 01-18-2016 10:58 PM
Re: Lapping piston rings
 
Quote:
Originally Posted by Mike Pearson (Post 493128)
Alan
Who do you talk to at JE. I need to get 2 pistons to replace 2 that were damaged

Thanks,
There is now a new guy at JE running the Stock and Super Stock program, his name is Allen. I have not dealt with him as of yet, but plan to talk to him in the next 2-3 weeks.

Larry Hill 01-19-2016 08:39 AM
Re: Lapping piston rings
 
George when you put a taper face ring into the fixture does it want to cup the ring up, away from the land when in compression?


Thanks Larry

Adger Smith 01-19-2016 08:49 AM
Re: Lapping piston rings
 
4 Attachment(s)
This is how a friend of mine back cuts rings to decrease tension.

Ed Wright 01-19-2016 09:30 AM
Re: Lapping piston rings
 
Quote:
Originally Posted by George Wright (Post 493180)
I had this tool made up about 25 years ago. It is for a 4.060 bore. On one side there is a dish cut in it that allows you to hold a ring inside of it. The ridge is about .025 tall so that the ring is exposed. I can then use this fixture to sand down the ring on a piece of fine paper taped to a piece of glass. The other side of this ring fixture is used for squaring rings in bores when checking / setting the ring end gaps.
Mine look just like that, but a little deeper. .035" for the old .043" rings I was using.
And, no the rings stayed in place just fine.
Lap one side flat, flip them over and lap the other side flat. Mic the ring, and if needed, touch up the thickness.

George Wright 01-19-2016 02:32 PM
Re: Lapping piston rings
 
Quote:
Originally Posted by Larry Hill (Post 493194)
George when you put a taper face ring into the fixture does it want to cup the ring up, away from the land when in compression?


Thanks Larry
I was not using tapered rings.

Ed Wright 01-19-2016 07:53 PM
Re: Lapping piston rings
 
Quote:
Originally Posted by Larry Hill (Post 493194)
George when you put a taper face ring into the fixture does it want to cup the ring up, away from the land when in compression?


Thanks Larry
Larry, the top rings I have used were all barrel faced. Had tapered second rings. Never lapped those.

JHeath 01-24-2016 03:28 PM
Re: Lapping piston rings
 
Finally figured out a way to post the article...

http://i.imgur.com/APjuKKdm.jpg
http://i.imgur.com/u09rh7ym.jpg

GTOMayhem 01-25-2016 02:54 PM
Re: Lapping piston rings
 
Thanks Jerry!

Rick Thomason
GTOMayhem

joe cool 01-25-2016 06:09 PM
Re: Lapping piston rings
 
Ok fellas ,I'm a dummy ,I just read a lot trying to understand. If you actually increase the thickness of the rings doesn't that allow compression to leak behind them.? Thanks


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