Bruce,
I'd like to share with you something that happened to me two weeks ago. I am
running exactly the same set-up as you - fast-road cam, headers, twin SU's,
higher compression head, etc. I was also running the Petronix electronic
ignition which started to go bad two weeks ago. I initially put the points
back in and the car ran quite well. I also have a spare XR700 system which I
decided I would go ahead and install (only took a few minutes because I just
velcroed down the gold "box"). Initially, I thought it was running quite
well with just some high rpm pinging. Turns out, that in order to get rid of
the pinging, I had to retard the timing so much, that I had turned into the
proverbial garden slug! It was a good thing that I was retarding the timing
by taking off the cap and rotating the optical sensor clockwise, instead of
rotating the actual distributor, because I just took out the XR700 and
dropped the points back in and everything was good again. So, the quandary I
was in was that: I didn't want to go back to Petronix, I didn't like the way
the XR700 made me perform, and the points just didn't have the high rpm
performance I needed. Someone on the list suggested looking in to the MSD 6A
unit, which utilizes the existing points (which last a long, long time with
this system) and has all the other benefits of elec. ignition. Mine is
coming tomorrow- I'll let you know how it performs.
Regards
Geoff Parker
74 TR6
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