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ls block with pr3 piston question????

Discussion in 'Engine Building' started by jpangeles, Jun 22, 2004.

  1. jpangeles

    jpangeles Junior Member

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    i have a 1990 ls integra block and have pr3 jdm piston? i want to use the pr3 piston in the block i just noticed that pr3 is 1.6 liter and ls integra is 1.8...do i need a oversized rings for this cituation or i can used the rings from the pr3?
     
  2. MikeBergy

    MikeBergy Blah blah blah....

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    You can use the pr3 rings, since they are the same bore size. The stroke of the motor is what makes the motor 1.6 or 1.8 liters. Just realize you are bumping compression quite a bit. You also need to use the ls rods. Pr3 rods are too short.
     
  3. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    same bore (81mm)

    the extra .2L is from the stroke
     
  4. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    doh!

    he beat me to it
     
  5. jpangeles

    jpangeles Junior Member

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    ohh thanks guys for ur help and ill be using the ls rods for my engine set up
     
  6. brian11to1

    brian11to1 Senior Member

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    your compression ratio will be around 10.9:1 or so...

    you can use the LS rods...
     
  7. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    More like 11.1, but it's close enough. :)
     
  8. brian11to1

    brian11to1 Senior Member

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    That all depends on the head gasket thickness and the head he uses...

    Stock LS head w/
    1 layer HG 11.69:1
    2 layer HG 11.39:1
    3 layer HG 11.10:1

    B16/B17/ITR Head w/
    1 layer HG 12.30:1
    2 layer HG 11.96:1
    3 layer HG 11.63:1

    B18C head w/
    1 layer HG 10.89:1
    2 layer HG 11.18:1
    3 layer HG 11.48:1
     
  9. jpangeles

    jpangeles Junior Member

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    actually this set up is for ls/vtec...ls block with a gsr head....what do u mean 3 layer gasket? is that i have to put 3 gasket so i can race my compression to the higher one?
     
  10. brian11to1

    brian11to1 Senior Member

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    Honda uses a 3 layer headgasket... you can change hte compression of a motor by putting a thinner head gasket in... such as a 2 or 1 layer.

    Simply put the head gasket has 3 layers to it... a 2 layer has 2, a 1 layer has 1. When you get the head closer to the block it raises the compression, the further away from the block you are the high the compression.
     
  11. calligra

    calligra Junior Member

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    I was looking at an LS/Vtec setup with those pistons I think you are around 11.6 : 1

    that is with OEM gasket

    B18 Block and B16 Head.
     
  12. brian11to1

    brian11to1 Senior Member

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