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Thread: cam observations

  1. #1

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    1993 Dodge Ram 50
    Engine

    4G64

    cam observations

    Attachment 22793
    first take rocker ratio, hypothetically -- 1.5
    Then dial indicator on cam lobe ---hypothetically .300

    Take .3 x 1.5 = .45

    You really need a degree wheel on the crankshaft to measure how much duration it is off of it's seat.

    You need to put a degree wheel on the crankshaft and record duration that the lifter is just coming off of it's seat (measured with a dial indicator on the lifter), and also try to get the duration @ .050".

    To do that you will need to divide .050" by the rocker arm ratio (1.5):

    .050"/1.5 = .0333"

    So you will need to measure the duration off of the lobe (without going through the rocker arm) at .033" on the dial indicator at each angle on the up stroke and down stroke.

    Then with lift AND duration we can better guess your cam. If you can measure the lobe centers for the intake and exhaust lobes also since you are mostly there anyway, we can have an even better guess.

    Every .033" on the dial indicator directly off the cam lobe will equal .050" lift at the rocker arm, which is how cams are spec'ed.
    Last edited by claych; 06-14-2019 at 01:48 PM.

  2. #2

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    1985 Mitsubishi L200
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    A good thread - maybe this can be reposted in the tech section as a reference guide
    support the forum that supports you - join and donate to MightyRam50.Net today! donations unlock the edit function

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