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Compression Calculator. I figured I'd be a little higher?

Discussion in 'Civic and CRX - EF' started by Andrew, Jul 28, 2006.

  1. Andrew

    Andrew Well-Known Member

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    SolBlu's Helpful Del Sol Site

    Current setup:
    D16a6 block/crank/rods
    D15b7 Pistons (pm3)
    D16z6 head
    I think z6 HG. Could be A6. ( I didnt do the piston swap, so idk what it is for sure)

    And It's showing 10.69:1.
    I was almost certain it was at least gonna be 11:1. maybe 11.2.

    Anyway. I bought a new HG from Majestic for a '96-'00 2dr EX.

    What should my compression be with the Piston and HG combo?
    PM3 Pistons and Y8 Gasket.

    I'm kinda hoping for 11.5:1 or somewhere around there.

    Hopefully someone might know off hand.
    Thanks
    -Andrew
     
    Last edited: Jul 28, 2006
  2. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    I thought we went over this already?

    I'm getting 11.19:1 compression with your PM3 pistons, A6 block and head, and a normal Z6 head gasket.

    You need to punch in 0 for your dish/dome and -.028 for your piston to deck height. The PM3 piston is .048in or 1.2mm taller than the PM6, so use the PM6 piston to deck height and add the .048in to it, then hit the button and get your answer.
     
  3. Andrew

    Andrew Well-Known Member

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    Thanks, and sorry, I guess I missed that post.

    I guess I forgot to mention it's a z6 mini-me engine... unless you meant my z6 head..

    -Andrew
     
    Last edited: Jul 28, 2006
  4. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Whoops. Z6 head.

    Standard Z6/Y8 gasket gives you 12.17:1 compression
    Standard A6 gasket gives you 11.79:1 compression
     
  5. Andrew

    Andrew Well-Known Member

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    Are you serious?
    WOW.

    I wasn't expecting it to be That high...
    Thats great!

    Thanks bro!
    -Andrew
     
  6. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    My mistake- that was a different person. Yours just looked really similar to this:

    http://hondaswap.com/civic-crx-ef/truth-about-d16s-pm3s-71062/

    I would be very wary of running the PM3 pistons in your build though. Get a set of PM7 pistons- you'll only spend about $50-60 to get them, and still have a very similar compression ratio.
     
  7. Andrew

    Andrew Well-Known Member

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    I was just reading that post a second ago, and was/am gonna link him this way for added refference.

    the PM7's are ZC's right?

    Anyway. What should I be concerned about with these pistons?
     
  8. Andrew

    Andrew Well-Known Member

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    Ah. I gotchu.

    Well. the're in there... they'll stay there until either the motor blows or I find another one to throw in there.

    what kind of damage will happen in the long run with running these pistons?
     
  9. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    You've already built the engine with those pistons? Does it run?

    FYI- the PM7 and P29 pistons are identical.
     
  10. Andrew

    Andrew Well-Known Member

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    I didn't put the pistons in, I bought the motor from a friend of mine that did.
    The motor runs fine. no problems at all.
    I'm hoping with this new HG it will still do so. 12:1 compression is a lot... I hope it'll handle it.

    -Andrew
     
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