MSD timing setting old school
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  1. #1
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    MSD timing setting old school

    Can not remember the numbers for setting timing on MSD total loss system using a dial indicator. Was there a formula? No degrees on wheel.
    Thanks out to Chris Newmiller & Robin Haas
    1994 550sx conversion hybrid 750 PJS reed motor build in process
    1993 550sx PJS 550 t3 reed motor build in process

  2. #2
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: MSD timing setting old school

    What timing (in deg) do you need. The engine (bore & stroke if not stock),
    are the con rods stock length?


    Bill M.
    Horsepower == Speed, RPM != Speed



  3. #3
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    Re: MSD timing setting old school

    Quote Originally Posted by wmazz View Post
    What timing (in deg) do you need. The engine (bore & stroke if not stock),
    are the con rods stock length?


    Bill M.
    Stock rods, bore 75.5, avgas 200psi, PJS cylinder T3. Was not sure yet what I was going to set it at. Recommendations? Thanks
    Thanks out to Chris Newmiller & Robin Haas
    1994 550sx conversion hybrid 750 PJS reed motor build in process
    1993 550sx PJS 550 t3 reed motor build in process

  4. #4
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: MSD timing setting old school

    I remember setting the type1 & type2 ignitions at 28 deg btdc.

    28 to 30 should work fine with an MSD.

    28 deg -> 4.31mm
    29 deg -> 4.61mm
    30 deg -> 4.92mm
    31 deg -> 5.24mm
    32 deg -> 5.57mm

    At PJS we did not recommend using av-gas. But since we knew
    people were going to do it anyway, we recommended 20:1 premix.

    I used to have engine builders from all over the country sending us
    heads or engines with instructions to increase the compression x psi.
    But many of even our good engine customers unfortunately did not
    know what the actual compression of the heads or engines were before
    they were machined because they had an average compression gauge.

    Hopefully you don't need this:

    If you know your geometric compression ratio, multiply it times 15,
    and you will end up with an approximation that will be accurate to
    a few psi (~3psi) at sea level. Compression decreases with air density
    as you move inland.



    Bill M.

    Do you know thousands your squish clearance is?

    550 or 440 pump and pipe? Just curious.
    Last edited by wmazz; 10-28-2021 at 01:23 AM.
    Horsepower == Speed, RPM != Speed



  5. #5
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    Re: MSD timing setting old school

    Bill Thank you ��

    No, don’t no squish clearance but can check it out. I do have a few different PJS heads I can check.

    440 pump 16.5 prop. Sending another to impros to get reworked. It will be 17deg

    Probably will use the PJS pipe but also have a WestCoast

    Thanks again

  6. #6
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: MSD timing setting old school

    .040" squish offers better performance, and minimizes the possibility
    of detonation.

    Stay away from the early PJS 440, 550 short pipes. The 2550 is best.


    Bill M.
    Last edited by wmazz; 10-30-2021 at 03:42 AM.
    Horsepower == Speed, RPM != Speed



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