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Need help calculating compression ratio...

Discussion in 'The Garage' started by fortcollinsram, Jan 30, 2003.

  1. fortcollinsram

    fortcollinsram 1/2 ton status

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    Okay...I am trying to figur out whjat the compression is going to be on the BBC I am building...here is all the pertinent info...

    -Gen V block, bored .030" over for a final bore of 4.280"
    -Stock 4.00" stroke crank
    -Stock oval port heads, milled .010" (they were 118cc stock, so I figure they are about 116cc or so now)
    -Replaced stock dished pistons with Hypereutectic Flat Tops, with 2 valve reliefs.

    So what is the compression ratio going to be? I think it is around 8.8 to 1 or so...

    Anybody?

    Chris
     
  2. Hossbaby50

    Hossbaby50 3/4 ton status

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    Hell with compression that low we should be putting on a supercharger this summer. /forums/images/graemlins/grin.gif Really get you some power.
     
  3. fortcollinsram

    fortcollinsram 1/2 ton status

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    Whipple will be hearing from my soon /forums/images/graemlins/thumb.gif I gotta get that motor built and in first though...Then I gotta by the other 2 37's...then we will talk fored induction /forums/images/graemlins/grin.gif /forums/images/graemlins/laugh.gif /forums/images/graemlins/thumb.gif
     
  4. HarryH3

    HarryH3 1 ton status Author

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  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Also the volume from the deck down to the top of the top ring...as well as the volume in the valve reliefs.

    Rene
     

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