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Thread: piston ring ???

  1. #1

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    piston ring ???

    why do some engine builders put there motors together with one ring instead of two .i know someone else had a motor setup like this . i figure if the piston has two rings you should use both of them .so whats the advantage .


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    I think I read somewhere it had to do with certain brand rings being so hard surfaced, that cylinder wear was a problem, and one ring reduced the wear rates.

    I might have gotten this wrong, however.

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by K447 View Post
    I think I read somewhere it had to do with certain brand rings being so hard surfaced, that cylinder wear was a problem, and one ring reduced the wear rates.

    I might have gotten this wrong, however.
    You're partly right. Not so much for wear reduction, but that it an added side affect. But more for pistion travel speed. Less friction means faster piston travel.

    In an all out race ski, every advantage is exploited. And prob replace rings more frequently than rec riders. So they run the 1 ring. I was told it was OK on the smaller engines, but not recommended on the bigger engines.

    I will be running the 2 rings on my Wiseco's this time. Not because I think that was the issue, but more because I eliminated the 3/8" of sleeve that hangs below the cylinder and wanted to reduce the risk of rocking inside the cyl.

  4. #4
    PolarisNut's Avatar
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    One ring cuts friction...less friction, more HP...Polaris is only using one ring on their new 800 twin fuel injected snomobile engine...There have been a few that question its long term durability...Doo CANNOT get them to last with just one ring...even when they switched from a moly faced ring to a chrome ring. If it isn't a race motor, I will always take 2 rings over 1. 2 rings also transfer the heat away from the piston dome better than 1. Less heat in the piston, and you are less likely to squeak it.

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