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  1. #136
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by Castiron355 View Post
    Cool. I'll have look tonight.
    Might change it yet... I dont want to have 2 cams with 16 split, might do this one 14 lol...

  2. #137
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    i'm going to have my head buried in that catalogue for hours. Lol

  3. #138
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    Quote Originally Posted by Castiron355 View Post
    i'm going to have my head buried in that catalogue for hours. Lol
    Yeah, thats what I like to do in my spare time...

    Every time you look, you find something you missed... WTF, never seen that lobe before.

    Quite a few variations there, when people get asked what cam is it and say 'its a secret', you can see that giving out numbers at that .050" checking height doesnt really mean anything unless you have something exactly the same.

    You could do a conversion like you do for head flow numbers going from 25" to 28"H2O and see if it works out going from a 3.48" stroke to a 3.063" stroke 308 and see what the cam specs would be if you went back to stock stroke...

  4. #139
    Do you ever leave? EH179's Avatar
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    Quote Originally Posted by paulzig View Post
    At seat durations it does with 108 LSA no advance its: 36 72 76 40 ... Pretty close.
    How do you come up with these numbers?

  5. #140
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    Quote Originally Posted by EH179 View Post
    How do you come up with these numbers?
    Intake and exhaust centreline average = lsa.
    Crank angles, crank overlap on journals, piston speed, etc are another story. Still in the too hard to do basket for me. 🤓

  6. #141
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    Quote Originally Posted by EH179 View Post
    How do you come up with these numbers?
    Lol.. he and TK would get along like a house on fire.. TK is a wizz with numbers.

  7. #142
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    Quote Originally Posted by EH179 View Post
    How do you come up with these numbers?
    cuz Pauly's a freak..........lol
    HOLDENS don't leak oil, they simply mark there territory! like a dog p!ssing on a tree

  8. #143
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    Quote Originally Posted by 355vhss View Post
    cuz Pauly's a freak..........lol
    Coz he can pres the + button on a calculator.

  9. #144
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    The crane 288 advertised numbers are 288 intake and 296 exhaust 108 LSA no advance 108ICL 108ECL just for a starting point.

    IVO= 288/2 = 144. 144 - 108ICL = 36
    IVC= 288-180-36 = 72
    EVO= 296-180-40 = 76
    EVC= 296/2 = 148. 148 - 108ECL = 40

    Change the cam intake and exhaust centrelines by advancing and retarding and numbers will change slightly.. I did this on calculator, but its easy to make a spreadsheet

  10. #145
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    Thank you for that!

    Knowing the formula, helps one understand just that little bit clearer.
    Last edited by EH179; 14-06-2018 at 04:27 PM.

  11. #146
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    We're all been schooled this week....

  12. #147
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    Quote Originally Posted by immortality View Post
    We're all been schooled this week....
    On mostly bullsh-t lol ...

  13. #148
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    I'm quiet intrigued by all this cam mumbo jumbo. I though I had a basic understanding but always happy to learn more.

  14. #149
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    Using the timing figures before tdc and the lift figure to 90 atdc will split the % of the lobe area revealing a shape - not just figures
    Spend time thinking about this and the world is clearer.

  15. #150
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    Seat to Seat duration and max lobe lift will make a rectangular box, the numbers you actually have makes up an area inside the box like this:



    Of course the motion of the valve will change depending on what rocker ratio you have, which is what the engine actually sees.

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