Lapping piston rings - Page 5

George Wright · 01-18-2016, 10:09 PM

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

Quote:

Originally Posted by Mike Pearson

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

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

This is how a friend of mine back cuts rings to decrease tension.

Ed Wright · 01-19-2016, 09:30 AM

Quote:

Originally Posted by George Wright

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

Quote:

Originally Posted by Larry Hill

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

Quote:

Originally Posted by Larry Hill

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

Finally figured out a way to post the article...

GTOMayhem · 01-25-2016, 02:54 PM

Thanks Jerry!

Rick Thomason
GTOMayhem

joe cool · 01-25-2016, 06:09 PM

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

01-18-2016, 10:09 PM	#41
George Wright Member Join Date: Nov 2002 Location: Michigan Posts: 180 Likes: 6 Liked 346 Times in 31 Posts	Re: Lapping piston rings 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. Attached Thumbnails __________________ George Wright https://9500rpm.com

01-19-2016, 08:39 AM	#43
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,443 Likes: 1,745 Liked 10,047 Times in 2,083 Posts	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 __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

01-19-2016, 08:49 AM	#44
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,399 Likes: 494 Liked 724 Times in 280 Posts	Re: Lapping piston rings This is how a friend of mine back cuts rings to decrease tension. Attached Thumbnails __________________ Adger Smith (Former SS)

01-24-2016, 03:28 PM	#48
JHeath Senior Member Join Date: Jul 2004 Location: Minneapolis Posts: 788 Likes: 2,890 Liked 371 Times in 102 Posts	Re: Lapping piston rings Finally figured out a way to post the article... __________________ Jerry Heath I/S '93 Cobra FS/J 2010 Mustang "Ebay CJ"

01-25-2016, 02:54 PM	#49
GTOMayhem Member Join Date: Oct 2014 Posts: 172 Likes: 669 Liked 22 Times in 14 Posts	Re: Lapping piston rings Thanks Jerry! Rick Thomason GTOMayhem

01-25-2016, 06:09 PM	#50
joe cool Junior Member Join Date: Jul 2012 Location: southwest iowa Posts: 53 Likes: 3 Liked 5 Times in 3 Posts	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 __________________ Joe Keightley Pacific Junction Iowa