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Thread: 7al3 question

  1. #1
    Member JUNIOR BUILDER
    Join Date
    Jan 2006
    Posts
    98

    7al3 question

    how many out there had trouble with msd7al3 box and what were they?

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Apr 2008
    Posts
    504

    They all have failures

    If you use any electronic ignition, you will have eventual electronic failures. I have used MSD stuff for 25 years or better now and have had some bad boxes out of the package and some great for 10+ years. I do not believe that there is a known problem with any one box that MSD makes, but some can be damaged more easily than other models can. I will continue to use the 7AL3 on everything I run because I find them reliable and easy to trouble shoot in the field. I think that MSD is the best choice for Un Blown gasoline Drag Racing applications in my opinion.
    As for what problems I have had, some miss fire at a given rpm, some stop firing altogether. For the most part they work or don't work or cause miss fire conditions. I have had two pro coils fail in 25 years and a few blaster coils fail as well.
    Bruce

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    May 2003
    Location
    Coldwater, MI
    Posts
    2,998

    Re: 7al3 question

    Quote Originally Posted by taps
    how many out there had trouble with msd7al3 box and what were they?
    A lot of the issues with that box are timing jumping around


    Ive never had a problem but know several who have.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  4. Racing Junk


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