More piston ring gap ?
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Cargo Master
Joined: Jul 2015
Posts: 2,069
Likes: 138
From: tucson
More piston ring gap ?
The spec for the 2nd ring gap is 0.010 to 0.020. My new rings are measuring out at 0.022. Is this something to worry about? If so, Can I order the next size rings and file them down to spec? I'm currently .030 over so can I file .040 rings?
Thanks. John
Thanks. John
Super Moderator
Joined: Apr 2004
Posts: 34,503
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There's an 800 number here. No you can't use .040 rings.
https://uempistons.com/rt-3-installa...tructions.html
https://uempistons.com/rt-3-installa...tructions.html
Fleet Mechanic
Joined: Nov 2002
Posts: 1,643
Likes: 69
I have a race motor with a very "special" block. When it needed new pistons my block machinist suggested ordering pistons only .005 larger in diameter than currently in there and using the next larger .010 ring pack, to save the bore iron for future bore jobs. He does it all the time on high dollar race motors.
No problems so far.
No problems so far.
Cross-Country
Joined: Aug 2013
Posts: 76
Likes: 0
File fit rings are normally only .005" over, like FTF'S application would come out to be. I wouldn't be concerned with .022 gap if it's a performance engine, but if it's a stock type rebuild I'd want a little tighter.
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Cargo Master
Joined: Jul 2015
Posts: 2,069
Likes: 138
From: tucson
RV cam 9.0 compression. EFI exhaust and offy intake. Went and bought a new set of feeler guages and using both sets, rechecked the gaps a little further down the cylinders. I'm at .024+ on five of them and .023 on the other. I will talk to machine shop this week but feel I'm too far out of spec for these. Also have a message left with the people at uem.
Thanks again everyone.
Thanks again everyone.
Fleet Mechanic
Joined: Nov 2002
Posts: 1,643
Likes: 69
I think the current ring pack is OK. You could make it tighter, but you will feel no seat-of-the-knickers difference in performance.
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Cargo Master
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