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Random thoughts,,,,,, not the original cam, thus no vacume at
idle,,,,,,,,,, most people say 36+ total degrees for mild
performance,,,,,,,,,,,,,,,,,,Sluggish ,,, cam and converter not matched to tire
and gear ratio,,,,,,Sluggish,,,,,, is it a vacume or mechanical secondaries on
the carb?,,,,, are the jets matched up to the rest of the car???
Summary,,,,,, performance parts it not matched for the complete set-up
sometimes produce less than the oem matched set-up
In a message dated 6/6/2011 11:25:54 A.M. Central Daylight Time,
shelby_nut@xxxxxxxxx writes:
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Good Monday! (if there is such a thing...)
So I was tuning up the 383 (1966, Weiand Intake, Holley 750, cam,
headers) on the weekend, and decided to check the timing. With the
vacuum advance disconnected, my base timing was well past the timing
tab, considerably, sitting at about 20+. Something's not right. When I
put it at 8-10, the revs came waay down and it ran like crap. Doing the
timing with a vacuum guage, it seemed to run best where it was, way
advanced.
I did some measurements and marked on the balancer where 35 would
roughly be (going to order a timing tape), as I don't have a
timing light with the advance dial, so I could check my total advance. I
put the revs up to 3500 and set the timing at 35. It was very close
to this already. I took the car for a drive, and it ran the same
as before, as I ended up not really adjusting the timing much from where
it was originally.
The car runs ok, no signs of detonation, but seems a little
sluggish, which prompted me to check the plugs, timing, etc.
From what I have been reading, it appears that a stock
distributor's mechanical advance should throw about 27 degrees of
advance in when the weights swing out. This on top of 8 base timing
would give the generally accepted norm of around 35 degrees total
mechanical advance.
I also noticed that I have no vacuum advance at idle. The
distributor vaccum canister is plugged into the vaccum port on the front
left of the holley 750, and, at idle (1000rpms), with my vaccuum gauge
connected, it's pulling nothing. Soon as I pull the revs up a bit, I get
vaccuum. Going to reroute the line to take vacuum directly from the
manifold, as I have vaccum at idle there.
So I'm trying to figure out why my base timing is so high. These
are the scenario's I've come up with...
1) Previous owner set the timing with an advance timing gun
and set total at 35, maybe the weights aren't swinging out enough or
stops modified to minimize mechanical advance, but why?
2) Due to the cam, maybe was setup this way to accomodate for the
lack of vacuum advance at idle (maybe answers 1 above)?
3) Balancer has slipped, but that wouldn't explain the low
amount of advance between base and total.
Any ideas?
Thanks
Jay
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