MSD Pro Cap

Discussion in 'PSI Superchargers Tech Questions' started by Flyboy68, Sep 21, 2009.

  1. Flyboy68

    Flyboy68 Member

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    We have a Pro cap on our Promag 44. It has a hole about 1/2" drilled in the top. Is this for phasing? And can we plug it off and use it? Or do we need to buy a new cap?

    Josh
     
    #1
    Flyboy68, Sep 21, 2009
  2. GregM784

    GregM784 Member

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    Probably to let the ozone out of the cap, to prevent cross firing in the cap. Our 44's don't have them, but some people think it helps. Doesn't hurt operation as long as no dirt/water/ stuff gets in the cap
     
    #2
    GregM784, Sep 21, 2009
  3. Mike Canter

    Mike Canter Top Dragster
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    If it is right up next to the plug wire terminal and at number one wire then it has been put there for phasing. If you don't need it then it doesn't hurt to leave it open. I leave mine open.
     
    #3
    Mike Canter, Sep 21, 2009
  4. Flyboy68

    Flyboy68 Member

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    Cool...thanks guys. I believe it is right by number one plug wire. Is that just simply so you can look in there and make sure it's straight up on # 1 when running a trigger? Or if using retards setting it one way or the other to compensate for the retard setting?
     
    #4
    Flyboy68, Sep 21, 2009
  5. Mike Canter

    Mike Canter Top Dragster
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    With a timing light
     
    #5
    Mike Canter, Sep 21, 2009

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