390 timing question
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390 timing question
[updated:LAST EDITED ON 19-Aug-02 AT 05:32 PM (EST)]Today I retimed my 390 and got it going but there is one thing wrong. I have noticed the "travel" range to advance/retard is different. I had to go further to the right side of the engine to advance it than I used to. Do I just need to keep adjusting the position of the distributor until I get it right? Any suggestions? Thanks!
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From: Watauga TEXAS
390 timing question
If you had the distributor out, then you're probably just a tooth off from where you had it. As long as you have enough room to adjust it to where you need it, you're fine. It won't hurt anything. Now, if you're like me and can't leave well enough alone, you can re-stab it to a position that is more cosmetically appealing.
Joe
Joe
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390 timing question
Yes, I did disconnect the vacuum lines and this 390 is a '72 with an Autolite 2100 carb. I believe I am just off a bit as well, and yes I am certain I will aggravate myself and try to get it "right". Thanks!!
Post Fiend
Joined: Feb 2000
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From: Brea CA
390 timing question
When was the last time you timed it? Have you removed the dizzy since? If you haven't and it's been a long time, you're just seeing the results of your timing chain stretch and retarding your cam.
Another possibility is your damper has slipped but I thought they go in the other direction.
Barry
Another possibility is your damper has slipped but I thought they go in the other direction.
Barry
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390 timing question
[updated:LAST EDITED ON 20-Aug-02 AT 06:09 PM (EST)]When I retimed it I put the crankshaft on TC, and the dis on #1. If I set it a little early, say at 16 degrees or less before TC would this put me back in the ball park?
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From: Watauga TEXAS
390 timing question
>When I retimed it I put the crankshaft on TC, and the dis on
>#1. If I set it a little early, say at 16 degrees or less
>before TC would this put me back in the ball park?
That's correct, I can't remember which way but if you turn the rotor this way or that, when you drop the distributor in, it will rotate to #1. Keep in mind, though, where you want #1 to be in relation to the intake so that you will have enough room for timing adjustment when you're done.
Joe
>#1. If I set it a little early, say at 16 degrees or less
>before TC would this put me back in the ball park?
That's correct, I can't remember which way but if you turn the rotor this way or that, when you drop the distributor in, it will rotate to #1. Keep in mind, though, where you want #1 to be in relation to the intake so that you will have enough room for timing adjustment when you're done.
Joe
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390 timing question
Well I retimed it a little early than TC and that cured the "range" problem. I've still got some hesitation from a standing stop. However, if I take off easy it doesn't really hesitate. Is this timing, or more along the lines of accelerator pump or float. I had both of those adjusted before, now I have to iron it out again. Thanks for the tips.
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From: Watauga TEXAS
390 timing question
Look down the carb (while the engine is turned off) and roll your throttle all the way back. You should see two solid streams of fuel coming from the discharge nozzles. If one is weaker than the other or they squirt in different directions, you have trash stuck in them. That can be your problem.
If that checks out ok, then richen your idle mixture screws by 1/2 turn and go test drive. If it helps, try it again. You may be able to work the hesitation out this way.
Joe
If that checks out ok, then richen your idle mixture screws by 1/2 turn and go test drive. If it helps, try it again. You may be able to work the hesitation out this way.
Joe
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