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<DIV style="WORD-WRAP: break-word">I recently installed a 123 Tune distributor
on my BJ8, replacing a Pertronix – mainly for ease of adjustments,
repeatability, and to eliminate the mechanical weights springs and vacuum
advance; and not be constrained by the mechanical limits of the Lucas/Pertronix;
a crank fired system was appealing but too much hassle to fit the toothed wheel
!</DIV>
<DIV style="WORD-WRAP: break-word"> </DIV>
<DIV style="WORD-WRAP: break-word">Works OK - now after realising you have to be
ultra diligent about taking up the rotor drive freeplay before closing the
cap.</DIV>
<DIV style="WORD-WRAP: break-word">Timing curves are set via a USB connection to
a PC.</DIV>
<DIV style="WORD-WRAP: break-word">Checked with a timing light and the advance
you set is what you get at the crank.</DIV>
<DIV style="WORD-WRAP: break-word"> </DIV>
<DIV style="WORD-WRAP: break-word">Hoping some other listers have installed a
123 Tune and would share the settings/curves that have worked best for them on
AH 3000 engines and not being constrained by mechanical advance. Also vacuum
settings that have worked.</DIV>
<DIV style="WORD-WRAP: break-word"> </DIV>
<DIV style="WORD-WRAP: break-word">My manual gives 10 deg. static advance and 15
deg strobe at 600 RPM then 34-38 deg at 6400 RPM.</DIV>
<DIV style="WORD-WRAP: break-word">I used max of 35 deg at 6400 RPM</DIV>
<DIV style="WORD-WRAP: break-word">When I use these settings the timing was too
retarded.</DIV>
<DIV style="WORD-WRAP: break-word">Checked with a vacuum gauge that was very
jittery at 700 RPM and way down at about 7-10 ins</DIV>
<DIV style="WORD-WRAP: break-word"> </DIV>
<DIV style="WORD-WRAP: break-word">To get a sensible vacuum reading (18ins) have
to use around 22 deg at 600 RPM. </DIV>
<DIV style="WORD-WRAP: break-word">Did some road testing – the 123 software has
a nice RPM stopwatch feature.</DIV>
<DIV style="WORD-WRAP: break-word">Around 22 deg seems to give best results.
Went from 1200 RPM to 2800 RPM in 4th and 3rd gears. Interesting - reducing
advance to 17 deg made a big difference – lot worse. Use 94 octane Chevron and
no pinging. Believe it is a standard cam. Only mod I have is a Maniflow
exhaust header. Compression is OK at 155 psi ave.</DIV>
<DIV style="WORD-WRAP: break-word"> </DIV>
<DIV style="WORD-WRAP: break-word">So why are these advance setting so different
to what the manual gives for the Lucas 25D ?</DIV>
<DIV style="WORD-WRAP: break-word">(I find some of the manual advance data to be
confusing particularly the decelerating and vacuum settings) </DIV>
<DIV style="WORD-WRAP: break-word">Unfortunately didn’t take a note of the
settings I used before I made the distributor change as had just set it “by
ear”.</DIV>
<DIV style="WORD-WRAP: break-word"> </DIV>
<DIV style="WORD-WRAP: break-word">Also wonder if anyone has tried manifold
vacuum for advance instead of the ported take off ? With the flexibility of the
123 it sort of makes sense to deviate from the standard settings.</DIV>
<DIV style="WORD-WRAP: break-word"> </DIV>
<DIV style="WORD-WRAP: break-word">rg </DIV>
<DIV style="WORD-WRAP: break-word"> </DIV>
<DIV style="WORD-WRAP: break-word"> </DIV>
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