I had an informative talk with Jeff at Advanced Distributors this morning. He
recommended a 45D Lucas with a 25D shaft assembly, cuz the larger diameter of
the 45 cap eliminates cross-fire issues. He balances the assembly, puts in a
full length shaft bushing, and makes some other improvements. He uses a high
quality cap with added ribbing, and says it does not flex, fits tightly and
does not have the problems of most replacement caps available. He also
supplies rotors (red) made for him. He says he can run the single points
set-up to 10,000 rpm on his machine without scatter. My unit will be set up
with advance of 18 degrees at idle (1500 rpm) going to full advance by 3000 rpm.
Of interest to me was the comments he had about Mallory, which is what I have
in the GT6. He was very critical of the light springs, which he said stretch
and cause scatter at all rpms. The shaft bushings don't last, and the plastic
bushings on the centrifugal weights don't last either. He indicated that these
units ought to rebuilt once a year, but stay in spec for only a few months, and
doesn't recommend them for that reason. I mentioned that inserting the Unilite
electronic module in mine seemed to have cured the scatter I saw with a timing
light, and he responded that the electronic unit masks the scatter from poor
bushings, but it's still there. He will rebuild these, but says it's not
cost-effective in the long run.
So, there's a modified Lucas 45 on the way for the TR4, with points for now, at
a very reasonable price. He doesn't need cores at this point - has 1500 on
hand.
Thanks to the group for all the feedback.
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