So, how do you break in piston rings

Discussion in 'Technical' started by justin has a 74, Jul 1, 2010.

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  1. bmcdaniel

    bmcdaniel Senile Member Supporting Member

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    You're correct, there are chrome-faced rings and moly-faced rings, but not chrome moly.
     
    bmcdaniel, Jul 4, 2010
    #16
  2. PaulS

    PaulS Member extrordiare

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    The chrome/moly rings are (or used to be) chrome rings with a groove (or two) that was filled with moly. This was supposed to allow the ring to seat faster like a moly ring and to last under high pressures and speeds like a chrome ring. It was not very successful because the coarse finish needed for the chrome ring usually rolled the moly out of the groove. They were not made of chrome-moly steel.
    You guys are way too young!:D
     
    PaulS, Jul 5, 2010
    #17
  3. baddad457

    baddad457 Member

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    Nope, not too young. Just never saw those rings. Only ones I've ever run across were black iron, chrome, and moly rings.
     
    baddad457, Jul 5, 2010
    #18
  4. PaulS

    PaulS Member extrordiare

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    Hastings makes the 2M 4026 rings for 2.5L turbo. This is a Plasma-Moly top ring (also known as Chrome-Moly because of the impregnated chrome in the Plasma-Moly)

    The ring material is ductile iron and in this case the plasma has both chromium and moly in it. There are others 2c4666 from Hastings for the Accura.
    http://www.hdmaddog.com/Acura-chrome-moly-piston/Honda-Acura/Piston-Rings/-p3677864.html

    Acura chrome moly piston rings B17A1 1992-93


    [​IMG]

    HST-2C4666 Brand new full set of chrome moly piston rings for the 1992-93 4-cylinder 1678cc B17A1 engine - 1.0mm 1.2mm 2.8mm configuration - 81mm (3.189 bore in standard - std. .010 .020 .030 .040 available
     
    PaulS, Jul 6, 2010
    #19
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