7al3 question

Old 02-01-2011, 01:47 PM
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Join Date: Jan 2006
Posts: 98
Default 7al3 question

how many out there had trouble with msd7al3 box and what were they?
taps is offline  
Old 02-01-2011, 02:07 PM
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Join Date: Apr 2008
Posts: 504
Default 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.
TopspeedLowet is offline  
Old 02-02-2011, 06:21 AM
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Join Date: May 2003
Location: Coldwater, MI
Posts: 2,998
Default Re: 7al3 question

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.
hammertime is offline  

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