Paul Yaw wrote:

Mike Wills wrote:

 What kind of reliability have you experienced with the MSD? Ive had MSD-6A
boxes on two different V8 powered street cars without ever having a
problem, but... A local acquaintance who buids race cars/engines for
various 1/8 - 1/4 mile dirt track classes (and who coincidentally is
building an RV-4 which has a 13B on it) says he always has 2 MSD boxes
mounted in the car that are driver selectable. The claim is that the boxes
are somewhat unreliable so there needs to be some redundancy. Perhaps this
only applies to the hotter MSD-7 race box?

Mike Wills

My experience has been the same as yours.  Never seen one fail, but have
heard that they are unreliable.  The main 6A on the dyno is one of the
oroginals from the 70's with the cheesy logo.  Still works.  Maybe
Archie has some input.  It is a simple enough device with gobs of heat
sink.  I always mount them away from engine heat, and that may be the
reason that I have not had problems.  I spent last racing season at the
local 3/8 paved oval, and I have seen them mounted on the firewall next
to the headers.  I wonder how long those last?  At least 50 laps I
guess!

PY

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