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Street Build Auto GSX 2.3L with Genesis Coupe 2.0T Pistons

Year:
1998
Model/Trim:
Mitsubishi Eclipse GSX
  1. DSMPT

    DSMPT Proven Member

    105
    15
    Joined Jun 12, 2014
    Hermosillo, Central America
    My DSM:
    1998 Mitsubishi Eclipse GSX

    Street Build

    16g   automatic
    1990 Mitsubishi Eclipse GSX

    Drag Race Build

    GT40   manual
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  2. import solutions

    import solutions Probationary Member

    13
    5
    Joined Apr 27, 2013
    colimA, Texas
    What you modified for these pistons
     
  3. DSMPT

    DSMPT Proven Member

    105
    15
    Joined Jun 12, 2014
    Hermosillo, Central America
    Machined down the compression height for 100mm stroke.
     
    My DSM:
    1998 Mitsubishi Eclipse GSX

    Street Build

    16g   automatic
    1990 Mitsubishi Eclipse GSX

    Drag Race Build

    GT40   manual
    Loading...
  4. import solutions

    import solutions Probationary Member

    13
    5
    Joined Apr 27, 2013
    colimA, Texas
    All Over is bolt on?
     
  5. import solutions

    import solutions Probationary Member

    13
    5
    Joined Apr 27, 2013
    colimA, Texas
    Eres Hiroshi?
     
  6. DSMPT

    DSMPT Proven Member

    105
    15
    Joined Jun 12, 2014
    Hermosillo, Central America
    Not only the compression height. Also need to machine the small end of rods for the pistons, like 2G pistons on 6 bolt rods. And use a thicker head gasket to lower the compression ratio and to have a sufficient piston to valve clearance. The compression ratio goes around 11.6 if use the standard .051" cometic head gasket. I set to 10.5:1.

    This project was just from my curiosity and not to use forged parts was like a brake for myself not to raise the boost. Of course, to use ready-made forged parts is much easier but was not my purpose.

    Yes, I am. Excuse me, have we met before?
     
    Last edited: Dec 7, 2017 at 5:55 PM
    My DSM:
    1998 Mitsubishi Eclipse GSX

    Street Build

    16g   automatic
    1990 Mitsubishi Eclipse GSX

    Drag Race Build

    GT40   manual
    Loading...
  7. import solutions

    import solutions Probationary Member

    13
    5
    Joined Apr 27, 2013
    colimA, Texas
    How much That pistons cost?, they see Good to a 2.4 piston alternative With some Over size, wich size are these 86 or 86.5?
     
  8. import solutions

    import solutions Probationary Member

    13
    5
    Joined Apr 27, 2013
    colimA, Texas
    También soy de México por eso te preguntaba
     
  9. DSMPT

    DSMPT Proven Member

    105
    15
    Joined Jun 12, 2014
    Hermosillo, Central America
    I used a DNJ Engine Components piston kit, costs around $220 with OEM piston rings. So quality is good. You can find cheaper one on eBay about a half price. But I did not use them because I was not sure about the quality. Some Honda pistons also can be used but they are not designed for turbo engine, so I chose Genesis 2.0T pistons. Since the pistons and the rings are designed for turbo engine. The piston size is 86.00mm. And this piston can not be used for 2.4L because this piston's compression height is lower than 2.4L (4G64) piston's compression height.

    Ahhh OK so probably we know each other in local or facebook. PM me please!
     
    My DSM:
    1998 Mitsubishi Eclipse GSX

    Street Build

    16g   automatic
    1990 Mitsubishi Eclipse GSX

    Drag Race Build

    GT40   manual
    Loading...
  10. Murdertalon

    Murdertalon Proven Member

    187
    32
    Joined Jul 7, 2016
    East side, Washington
    I was told by a honda guy that all honda engines use forged internals factory, is there any truth to this or is it specific engines or something? I actually have no idea as I don't mess with hondas.
     
    My DSM:
    1995 Eagle Talon TSi AWD

    Street Build

    T25   manual
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  11. DSMPT

    DSMPT Proven Member

    105
    15
    Joined Jun 12, 2014
    Hermosillo, Central America
    For this project, the piston's specs needed to be 85.00-86.00mm and 22mm wrist pin and the compression height 1.13" or a little bit higher than 1.13" to machine down. Honda's F22 pistons have the numbers very close. So I checked F22 pistons but they were cast. I am not sure about all Honda's pistons though.
     
    My DSM:
    1998 Mitsubishi Eclipse GSX

    Street Build

    16g   automatic
    1990 Mitsubishi Eclipse GSX

    Drag Race Build

    GT40   manual
    Loading...
    Murdertalon likes this.
  12. arrowhead

    arrowhead Proven Member

    523
    22
    Joined Apr 19, 2011
    miami, Florida
    Good find.
    So what is the comp height 1.13? with 22mm pin diameter, do you know the stock dome height.
    This looks like a good option for an n/a motor.


    Mandy
     
    My DSM:
    1998 Eagle Talon TSi

    Road Race Build

    16g   manual
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  13. DSMPT

    DSMPT Proven Member

    105
    15
    Joined Jun 12, 2014
    Hermosillo, Central America
    The comp height of 2.3L (4g63 block + 150mm rod +100mm crank) is 1.13". The Genesis coupe 2.0T pistons have approximately 1.17" height (I used a cheap digital vernier caliper, so not super exactly). So the pistons need to be machined down about 1mm / .004".
    The genesis pistons are almost flat top, have approx -2cc~-2.5cc dish (the depth of dish is 0.65mm). After machine down 1mm, the pistons would have 7.9mm thickness (the stock thickness 8.25mm minus 0.35mm) in the center of piston.
    About the rods, I used 7 bolt rods since it is easier to find a 7 bolt 100mm crank than 6 bolt one. Just machine the small end width. I shaved 2mm each side, so the total would be 4mm.
     

    Attached Files:

    Last edited: Dec 7, 2017 at 9:55 PM
    My DSM:
    1998 Mitsubishi Eclipse GSX

    Street Build

    16g   automatic
    1990 Mitsubishi Eclipse GSX

    Drag Race Build

    GT40   manual
    Loading...
    Murdertalon likes this.
  14. DSMPT

    DSMPT Proven Member

    105
    15
    Joined Jun 12, 2014
    Hermosillo, Central America
    Yeah, actually I was planning this for a non turbo 2.3 stroker but since this car is my daily drive, I couldn't wait to prepare all necessary parts. So I decided to go for turbo setup with lowering the compression ratio.
    If you have a way to machine the pistons and rods, would be cheaper than buying a high compression forged piston kit.
     
    Last edited: Dec 8, 2017 at 10:29 AM
    My DSM:
    1998 Mitsubishi Eclipse GSX

    Street Build

    16g   automatic
    1990 Mitsubishi Eclipse GSX

    Drag Race Build

    GT40   manual
    Loading...
    Murdertalon likes this.

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