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I'd like to see a test with a blowby meter installed, with a properly setup gapped ring, vs a gapless..and see what is really going on. Conventional gapped rings aren't designed to seal sitting on engine stand with the engine off. I think its pretty much been proven many times by some pretty big time engine builders/race teams, that the low leakdown numbers when comparing gapless rings, have no real world relation to what is really going on once the engine is off the stand.
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Originally Posted by Brandonb_05
(Post 4381338)
I understand the theory on opening up the second ring end gap. My question is what about the total seal gap less
Rings? Or do you not recommend using those style rings? |
Originally Posted by MILD THUNDER
(Post 4381384)
I'd like to see a test with a blowby meter installed, with a properly setup gapped ring, vs a gapless..and see re what is really going on. Conventional gapped rings aren't designed to seal sitting on engine stand with the engine off. I think its pretty much been proven many times by some pretty big time engine builders/race teams, that the low leakdown numbers when comparing gapless rings, have no real world relation to what is really going on once the engine is off the stand.
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when checking leak down on a fresh rebuild w/ file fit rings,I see 2% or less.Then on the other token,My engine ran like a mofo,some of the fastest speeds out of them.when leaked down,6 out of 8 cylinders had 40-50% leak down.go figure.
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Originally Posted by MILD THUNDER
(Post 4381384)
I'd like to see a test with a blowby meter installed, with a properly setup gapped ring, vs a gapless..and see what is really going on. Conventional gapped rings aren't designed to seal sitting on engine stand with the engine off. I think its pretty much been proven many times by some pretty big time engine builders/race teams, that the low leakdown numbers when comparing gapless rings, have no real world relation to what is really going on once the engine is off the stand.
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It be cool to be able to hook up a blow by meter, and monitor those numbers, as when its time to do a freshen up. I read a post on one of the sites like yellowbullet or speedtalk, where they had a used/ran engine that had super low leakdown numbers with gapless rings, and when they strapped it to the dyno, the blowby cfm under full throttle load was off the chart.
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Originally Posted by mike tkach
(Post 4381391)
i agree,putting 100lbs air pressure in the plug hole will allow more air to leak through the ring gaps than when the piston is moving a mile per second in it,s bore.espically with the engine at operating temp.
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When people are talking gapless rings, can they state if gapless top or 2nd ring ? Thanks.
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Originally Posted by horsepower1
(Post 4381260)
Flatness of +/- .0005 = total deviation of .001. Not face flatness, but flatness as when you lay the ring on a table. Most "performance" rings are ground flat but, for example, Total Seals AP (Advanced Profile) rings are lapped and can achieve a much flatter surface to seal on the ring land in the piston. I would venture to say a 5/64 iron ring isn't even ground, but parted on a lathe and left with a machine finish. This is why I told the OP don't worry about the gap...that ring is losing a lot of seal just in it's inherent design.
The second ring is already .004 bigger at .029. I have heard people running a gapless second ring, if they really sealed that well, wouldnt they cause problems on the first ring? Thanks for the technical input rather than bickering(for every one not you).. |
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