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  1. #16
    Do you ever leave? paulzig's Avatar
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    F-ck all in it really between a 6 and a 5.7...

    Both at 7000RPM, Heres a 5.7" rod:

    Maximum Intake System CFM @28in.= 250.188 to 264.949 CFM at 107.00 % VE
    Maximum Piston CFM @28 inches = 305.108 at 125% VE to 335.618 at 135% VE

    Maximum Piston Velocity = 6670.080031 FPM occurs at 74.309427 ATDC
    Average Piston Velocity = 4060.000000 in Feet Per Minute

    Piston Depth at 74.309427 degrees ATDC = 1.521143 inches
    Cylinder Volume = 317.9591 CC

    Heres a 6" rod:

    Maximum Intake System CFM @28in.= 249.127 to 263.825 CFM at 107.00 % VE
    Maximum Piston CFM @28 inches = 303.813 at 125% VE to 334.194 at 135% VE

    Maximum Piston Velocity = 6641.776616 FPM occurs at 74.951927 ATDC
    Average Piston Velocity = 4060.000000 in Feet Per Minute

    Piston Depth at 74.951927 degrees ATDC = 1.528342 inches
    Cylinder Volume = 319.4638 CC

    Not much but in it, the 6" rod will have a lighter piston but the 5.7 will pull a bit harder on the intake port at max piston speed..

  2. #17
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    [QUOTE=paulzig;748224]F

    It's really helpful mate. I had Tighe Cams scan my cam. So I have lift and area figures in .01" increments up to .100". So now I just want to look at the relationship of the valve to the piston etc. Great stuff. Eventually I'll buy another set of Speedmaster blank heads and start from scratch.

    Yeah they aren't the best, but if I stuff it up I wont be throwing 3k"s worth of Aluminium in the bin. Lol

  3. #18
    Do you ever leave? paulzig's Avatar
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    Fun to stuff around with these things... Dont forget that movement of air isnt instantaneous, along with that goes the delay in the valve train with deflection etc you never have what you think you have.

    The cam also has to take into account your rocker arm which depending on ratio will change durations.. After all its all about the motion of the valve itself the numbers on the cam arent reality..

  4. #19
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    True true. I figure if you calculate for 100% by the numbers and get a 90% result. Gotta be happy with that.

  5. #20
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by Castiron355 View Post
    True true. I figure if you calculate for 100% by the numbers and get a 90% result. Gotta be happy with that.
    110% of the numbers sounds better...

  6. #21
    Do you ever leave? HQ308Ute's Avatar
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    alloy heads can always be fixed
    https://racemagazine.com.au/tag/tony-knight

  7. #22
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    110% of the numbers sounds better...

    Indeed.

    alloy heads can always be fixed
    https://racemagazine.com.au/tag/tony-knight

    Damn!!!! That's an A for effort!!

  8. #23
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by Castiron355 View Post
    110% of the numbers sounds better...

    Indeed.

    alloy heads can always be fixed
    https://racemagazine.com.au/tag/tony-knight

    Damn!!!! That's an A for effort!!
    Tony's a good guy ... Does really excellent work.

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