Maybe the guy who setup this motor DID know what he was doing....I've been doing some reading and some people are saying with a high lift cam they have to bump the initial timing as far as it will go before it starts kicking back on the starter to get a decent idle, then modify the stops in the distributor to give the total advance desired.
This appears to be what going on with my timing, high base advance, but the distributor isn't throwing as much mechanical advance as a stock distributor would.
I pulled the cap off and it appears to have the original heavy springs in it, I turned the rotor and there is some mechanical advance but I don't have another distributor to compare it to so can't tell if it's movement has been restricted.
I guess either way, I have decent idle at the high base advance, and 35(ish) at full mechanical advance, so it's running fine, just thought the high base timing was kinda wierd.
I've ordered the MP light spring package to pull in total advance a little earlier, should help it at the lower rpm's comin off the lights, will take a good look while I'm in there. Also have a timing tape on order so I'll be able to check things out a little more accurately.
As for the sluggishness, could have something to do with the fact that I had my other car out earlier in the day, kinda hard act to follow.....
Jay
64 Windsor 383 Convertible
94 Viper RT/10
--- On Mon, 6/6/11, doug daniel <dougdaniel50@xxxxxxxxx> wrote:
From: doug daniel <dougdaniel50@xxxxxxxxx>
Subject: Re: Timing
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Received: Monday, June 6, 2011, 8:21 PM
could be one tooth off on the distributor ,,just sayin ,,,
--- On Mon, 6/6/11, Dodger7998@xxxxxxx <Dodger7998@xxxxxxx> wrote:
From: Dodger7998@xxxxxxx <Dodger7998@xxxxxxx>
Subject: Re: Timing
To: 1962to1965mopars@xxxxxxxxxxxxxxxx
Date: Monday, June 6, 2011, 12:44 PM
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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