In reply to a message from Jeff R sent Sun 21 Mar 2010:
Jeff,
I have an opinion based only on my experience with my S-2 which
came with a 41207. So take it with a grain of salt. It’s important
to remember that many of our Jag heads have been skimmed during
refurbishment. Therefore, your combustion chamber volume may be
different from mine. A timing curve that works for me, may not work
for you. You’re question of ‘‘which curve is best?’’ is almost moot,
apples & oranges because of engine differences.
Broad brush: you want as much advance in, as quickly as you can
without pinking. You have pinking, so cut back on advance at that
rpm. Nice to have a programable distributor!
With today’s faster burning fuel, I wouldn’t think you’d need more
than 34-36 degrees total, maybe less. Certainly going to 45 deg.
total like a stock S-2 could spell trouble. My 2 cents, feel free
to ignore.
Good luck
Dave–
1969 BRG OTS
Skaneateles, NY, United States
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