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Thread: ? for the gurus

  1. 7th October 2009, 20:17 #1
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    ? for the gurus

    How do I find out the CC rating on a bored out engine ? Is there a mathematical equation ? I.E. bore x stroke x something else
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  2. 7th October 2009, 20:50 #2
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    Use Pi R squared x Height for each cylinder

    I.E. 3.142857 times the Radius Squared (Radius of the bore) times the Height (stroke).

    Add the result for each cylinder together to obtain the final displacement.

    That should get you pretty close.

    Or use this online calculator

    http://www.csgnetwork.com/cubicinchcalc.html#
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  3. 7th October 2009, 20:54 #3
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    full it up with water
    and see how much ya get a out, litre = 1000cc

    MFSC lives on!
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  4. 7th October 2009, 20:58 #4
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    Quote Originally Posted by P38 View Post
    Use Pi R squared x Height for each cylinder

    I.E. 3.142857 times the Radius Squared (Radius of the bore) times the Height (stroke).

    Add the result for each cylinder together to obtain the final displacement.

    That should get you pretty close.

    Or use this online calculator

    http://www.csgnetwork.com/cubicinchcalc.html#
    do you have to take into account the 'dome' part in the head?
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  5. 7th October 2009, 21:07 #5
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    Quote Originally Posted by bogan View Post
    do you have to take into account the 'dome' part in the head?
    Yes but only the portion the piston doesn't fill when it reaches TDC.

    Use the calculator it will account for this.
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  6. 7th October 2009, 21:18 #6
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    Quote Originally Posted by P38 View Post
    Yes but only the portion the piston doesn't fill when it reaches TDC.

    Use the calculator it will account for this.
    Cheers for that P38

    Result = 734cc single cylinder : thump thump thump
    Thanks for the tip sidewinder but I just got the last o.s. piston in captivity and I don't want to wreck it
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  7. 7th October 2009, 21:22 #7
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    Quote Originally Posted by JATZ View Post
    Cheers for that P38

    Result = 734cc single cylinder : thump thump thump
    Thanks for the tip sidewinder but I just got the last o.s. piston in captivity and I don't want to wreck it
    No worries.

    What have you got that in?
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  8. 7th October 2009, 21:36 #8
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    Quote Originally Posted by P38 View Post
    No worries.

    What have you got that in?
    DR big 750cc single
    Attached Thumbnails Attached Thumbnails Click image for larger version.  Name: Big.jpg  Views: 15  Size: 163.0 KB  ID: 146069  
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  9. 8th October 2009, 07:01 #9
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    You will have to go deeper than that to test it Sidewinders way..


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  10. 8th October 2009, 07:12 #10
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    Quote Originally Posted by gwigs View Post
    You will have to go deeper than that to test it Sidewinders way..
    o thought you were going to say you will have to go deeper to see how big my bore is lol

    MFSC lives on!
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