ring gap
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ring gap
I am getting ready to assemble my 460 std bore. I have mahle moly rings going on KB hypereutectic pistons with valve relief to up the compression some. I have read that .0065 X 4.360 is the ring gap I want for NA with no nitrous. I may want to run nitrous in the future (just a small shot for a grin once in a while) Should I go with the 0080 X 4.360 or not? Maybe somewhere in between?
Other mods to the engine are:
Weiand intake
Street demon carb
Flotech headers
Lunati Vudoo cam kit (lifters, springs, timing set, cam)
HEI distributor
Thanks for the help.
Other mods to the engine are:
Weiand intake
Street demon carb
Flotech headers
Lunati Vudoo cam kit (lifters, springs, timing set, cam)
HEI distributor
Thanks for the help.
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Senior User
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I finally got ahold of someone from UEM.
The answer is go with 0080 mulitplier on the first ring even if I am not running nitrous right now since it's in a truck that may tow a trailer once in a while.
.0040 multiplier on the second ring. There is no difference on this one nitrous or not.
Interestingly, he said you can yank to the top of a piston clean off if you don't allow enough ring gap so err on the side of caution.
The answer is go with 0080 mulitplier on the first ring even if I am not running nitrous right now since it's in a truck that may tow a trailer once in a while.
.0040 multiplier on the second ring. There is no difference on this one nitrous or not.
Interestingly, he said you can yank to the top of a piston clean off if you don't allow enough ring gap so err on the side of caution.
Cargo Master
Joined: Oct 2020
Posts: 2,685
Likes: 789
I finally got ahold of someone from UEM.
The answer is go with 0080 mulitplier on the first ring even if I am not running nitrous right now since it's in a truck that may tow a trailer once in a while.
.0040 multiplier on the second ring. There is no difference on this one nitrous or not.
Interestingly, he said you can yank to the top of a piston clean off if you don't allow enough ring gap so err on the side of caution.
The answer is go with 0080 mulitplier on the first ring even if I am not running nitrous right now since it's in a truck that may tow a trailer once in a while.
.0040 multiplier on the second ring. There is no difference on this one nitrous or not.
Interestingly, he said you can yank to the top of a piston clean off if you don't allow enough ring gap so err on the side of caution.
A story on end gaps: A couple of years ago I rebuilt a 350 Chevy engine for a guy who wanted to run nitrous. I followed the instructions that came with the rings(Mahle) and put the engine together. After it was assembled I ran it on my dyno and the customer came down to help with the testing and have some fun. He noticed right away that I didn't have any breather in the valve cover yet no oil came out and he really couldn't see any significant blow by. He said, "I thought I told you to gap the rings for nitrous did you forget"? I told him I did and he was amazed at how little it leaked under load. In other words it doesn't hurt much to have a little extra end gap. That engine made 600 horsepower at 7000rpm and he ran a 200 shot most of the time.
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And that happens a lot with a KB hyper piston if the ring end gap recommendations are not followed.
A story on end gaps: A couple of years ago I rebuilt a 350 Chevy engine for a guy who wanted to run nitrous. I followed the instructions that came with the rings(Mahle) and put the engine together. After it was assembled I ran it on my dyno and the customer came down to help with the testing and have some fun. He noticed right away that I didn't have any breather in the valve cover yet no oil came out and he really couldn't see any significant blow by. He said, "I thought I told you to gap the rings for nitrous did you forget"? I told him I did and he was amazed at how little it leaked under load. In other words it doesn't hurt much to have a little extra end gap. That engine made 600 horsepower at 7000rpm and he ran a 200 shot most of the time.
A story on end gaps: A couple of years ago I rebuilt a 350 Chevy engine for a guy who wanted to run nitrous. I followed the instructions that came with the rings(Mahle) and put the engine together. After it was assembled I ran it on my dyno and the customer came down to help with the testing and have some fun. He noticed right away that I didn't have any breather in the valve cover yet no oil came out and he really couldn't see any significant blow by. He said, "I thought I told you to gap the rings for nitrous did you forget"? I told him I did and he was amazed at how little it leaked under load. In other words it doesn't hurt much to have a little extra end gap. That engine made 600 horsepower at 7000rpm and he ran a 200 shot most of the time.
Thanks for the info.
It backs up my decision to go bigger.
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