Timing Issues
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4wd Low
Joined: Apr 2022
Posts: 14
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Thank you all for the help.
I would like to add, for the time being, I set the advance quite a bit further. I beleive my total advance is reached at 2800-2900 RPMs, and a reading of 48 deg total timing. Runs a lot better, but is really hard to start.
I can keep it here for the time being, but would like to know if anyone else is running that kind of advance.
I would like to add, for the time being, I set the advance quite a bit further. I beleive my total advance is reached at 2800-2900 RPMs, and a reading of 48 deg total timing. Runs a lot better, but is really hard to start.
I can keep it here for the time being, but would like to know if anyone else is running that kind of advance.
Lead Driver
Joined: Jan 2019
Posts: 5,063
Likes: 860
From: N.W. Alabama
Cargo Master
Joined: Jan 2019
Posts: 3,369
Likes: 16
From: Caraway, AR
I run 14* initial timing. 26* of mechanical advance. 24* of vacuum advance. I think the most timing I pull the way it's curved is 56* at 2500rpm. I have a dual vacuum signal input to the vacuum advance. I've only seen one other truck set up that way. I have Venturi vacuum and manifold vacuum teed together with a check valve that reduces the manifold signal something like 5". Makes the vacuum signal a bit smoother best I can tell from mapping it. Now, I spent a lot of time fiddling with mine and getting it where I wanted it. I want to say the standard is 36* total mechanical or 54* total timing, something in that range.
Thread Starter
|
4wd Low
Joined: Apr 2022
Posts: 14
Likes: 0
I run 14* initial timing. 26* of mechanical advance. 24* of vacuum advance. I think the most timing I pull the way it's curved is 56* at 2500rpm. I have a dual vacuum signal input to the vacuum advance. I've only seen one other truck set up that way. I have Venturi vacuum and manifold vacuum teed together with a check valve that reduces the manifold signal something like 5". Makes the vacuum signal a bit smoother best I can tell from mapping it. Now, I spent a lot of time fiddling with mine and getting it where I wanted it. I want to say the standard is 36* total mechanical or 54* total timing, something in that range.
Cargo Master
Joined: Jan 2019
Posts: 3,369
Likes: 16
From: Caraway, AR
I wouldn't. I'd just run ported vacuum. The signal is supposed to drop off under a heavy load. Shouldn't have anything at wide open throttle. All my readings I pulled in my thread were at cruise. The timing would be quite a bit different under acceleration.
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