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piston swap

Discussion in 'HYBRID -> ED-EF / DA' started by Dark91zc, Dec 15, 2004.

  1. Dark91zc

    Dark91zc Senior Member

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    can i put d15b2 flat top pistons in a dohc zc engine to lower compression
     
  2. b204dr

    b204dr Senior Member

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    imma say no but thats just an educated guess seeing u cant usually use sohc parts on a dohc engine every (internally) harness and things like that are a little diff @!
     
  3. Dark91zc

    Dark91zc Senior Member

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    the only thing that looks different is the stroke the bore seems to be the same.
     
  4. ryan89crx

    ryan89crx Senior Member

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    the bore is the same considering that they are both d series motors. the zc is the biggest stock piston so the b2 piston will lower the compression. dont know by how much though. ill search around. this might help a little though http://www.knology.net/~jediklc/D.htm
     
  5. hcivic.com

    hcivic.com Senior Member

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    what about the size of the rods?
     
  6. ryan89crx

    ryan89crx Senior Member

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    he just has to use the zc rods to make anything work. 1.5 rods will not work in a 1.6
     
  7. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Nope. The PM3 pistons from the D15B2 will actually raise compression by quite a bit, and that's only if you can get the pistons to run in your engine without slamming into the head. The PM3s may be flat topped compared to the PM7 pistons, but they also have a considerably higher compression height.

    IF you were able to get everything to work, you would get a compression ratio of 9.6:1. The PM3s will also stick up about 0.684mm above the block at TDC.

    If you want to lower compression with OEM pistons, stay with D16 pistons so you don't have to worry about hitting the head at TDC. Any OEM D16 piston other than the PM7 will lower your compression ratio.
     
  8. Dark91zc

    Dark91zc Senior Member

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    ok
    sound good
    i have 3 d15 motor laying around

    thanks for the help
     
  9. ryan89crx

    ryan89crx Senior Member

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    ya, i just noticed that when looing at the compression calculator. ive heard all over the place that the zc and pistons were the biggest but when i tried to enter the values into the calc for the b2, it was a negative value(out of the hole) thanks for the correction
     
  10. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    No problem. I'm just trying to make sure everyone gets the right info.
     
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