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Cam Timing

Discussion in 'Motorcycle Tech Talk' started by JohnnyBiker, Dec 30, 2011.

  1. JohnnyBiker

    JohnnyBiker Well-Known Member

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    If a cam has the timing of 20 BTDC, I am assuming that it is better than a cam that has a timing designation of 18 BTDC. This comparison means that the cam with 20 BTDC is open just a little bit before the 18? Correct??
    JohnnyBiker, Dec 30, 2011
    #1
  3. Lucifer

    Lucifer Well-Known Member

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    Lucifer, Dec 31, 2011
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  4. eieio4tn

    eieio4tn Active Member

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    good reading,,,thanks
    eieio4tn, Dec 31, 2011
    #3
  5. JohnnyBiker

    JohnnyBiker Well-Known Member

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    Thanks Lucifer....:cool:
    JohnnyBiker, Dec 31, 2011
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  6. djl

    djl Active Member

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    If you are referring to intake valve timing, it could be better, could be worse; depends on the resulting cylinder pressure which is a function of other factors. A 2* earlier close just means that the intake valve closes earlier and will build higher cylinder pressure for combustion because it has captured more A/F in the cylinder.
    djl, Jan 1, 2012
    #5

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