Results 1 to 3 of 3

Thread: 7al3 question

  1. #1
    Join Date
    Jan 2006

    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

    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.

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    May 2003
    Coldwater, MI

    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
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines

  4. Racing Junk

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Copyright © 2005-2016 MH Sub I, LLC dba Internet Brands All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy