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d15b2 pistons help

Discussion in 'Civic and CRX - EF' started by sckrx, Sep 28, 2006.

  1. sckrx

    sckrx New Member

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    hey guys new to hondaswap.com and just have a few questions. i have a 90 crx dx with d15b2 motor i was wondering if i could use my stock rods and crank with PM7(zc) pistons without any problems? And what would compression be? i used a compression calculator
    and it said 10.5:1 i just want to verify i typed in the right info. tnx.
     
  2. jlicrx

    jlicrx Senior Member

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    yes, you can use the PM7 pistons without a problem the compression ratio with D15 block, rods, head and head gasket with the PM7 is 9.13:1 - this is because the PM7 pistons have a compression height of 29mm, which puts the top of the pistons 2.2mm (0.0866") down in the cylinder from the top of the block - the D15 pistons are only down in the cylinder 0.5mm (0.020") - the stock D15B2 compression ratio is 9.18:1 - using the PM7 pistons will lower your compression
     
  3. sckrx

    sckrx New Member

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    so what pistons could i use to raise compression on the cheap? I mean without having to spend $400 for forged pistons. looking to get into at least the 10.5:1 range of compression. tnx
     
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