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2G NPR Piston Rings won’t fit

Posted by xv_dsm, Dec 10, 2019

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  1. xv_dsm

    xv_dsm Probationary Member

    16
    4
    Joined Sep 3, 2019
    North Charleston, South Carolina
    So I finally bought a oem piston since one of the original was damaged and it’s the same size as the others. I went along and purchased some NPR Piston Rings for it but when I went to put the oil rings in, with only 2 in, and they were already tight and the third ring wouldn’t even go in. It did this with the other 3 pistons. I wondering if I’m doing anything wrong or if I should check something else or if I simply have the wrong part. If I have the wrong part then is anybody willing to buy it off me I can’t find the receipt.
     

    Attached Files:

    Street Build 169  2

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
  2. DSMPT

    DSMPT Proven Member

    554
    209
    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    It seems you got a wrong set. I assume that you have a set of 2g pistons, the oil rings in the pics won't fit with your 2g pistons. The ring set in the pics is for 1g. You need a ring set for 2g 95-99.
     

    Drag Race Build 1K  2

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 1K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
    Loading...
    xv_dsm likes this.
  3. xv_dsm

    xv_dsm Probationary Member

    16
    4
    Joined Sep 3, 2019
    North Charleston, South Carolina
    @DSMPT I had a feeling that’s what it was for. I read that mitsubishi oem pistons are very reliable do you know how the two work and which one would you prefer ?
     

    Street Build 169  2

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
  4. DSMPT

    DSMPT Proven Member

    554
    209
    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    2g pistons have higher compression ratio and lager diameter wrist pins than 1g 6 bolt. If you have 2g pistons, get a ring set for 2g pistons. that would be the easiest and cheapest.
     
    Last edited: Dec 11, 2019

    Drag Race Build 1K  2

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 1K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
    Loading...
    xv_dsm likes this.
  5. xv_dsm

    xv_dsm Probationary Member

    16
    4
    Joined Sep 3, 2019
    North Charleston, South Carolina
    thanks you were really helpful.
     

    Street Build 169  2

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
    DSMPT likes this.

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