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Author Topic: Another question on timing-  (Read 36847 times)

Offline blazer74

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Another question on timing-
« Reply #60 on: December 26, 2015, 10:24:29 am »


Here's a hot air style with the arrows. Lean is less rich is more tension.

Full or ported. What works best for you?  I run full manifold. I have run it both ways. Lots of info on here about that. It's about idle quality cause once you hit the gas vac goes away until rpm's stabilize.

Like you said that's a discussion in its self and don't want to start a feeding frenzy.

You covered that on your other post anyways.
« Last Edit: December 26, 2015, 10:31:40 am by blazer74 »
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Offline Irish_Alley

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Re: Another question on timing-
« Reply #61 on: December 26, 2015, 03:32:28 pm »
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Offline philo_beddoe

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Another question on timing-
« Reply #62 on: December 26, 2015, 07:37:38 pm »
Major update!! When I dropped my truck off for new valve seals, the mechanic rearranged some of the vac lines and set the timing to 8 btdc, no advance at all. Well I rearranged all those vac lines according to "rich weyand", advanced the time to about 12 btdc and moved the choke coil just a micro fiber to the right. I don't have the technology to explain what happened, but the engine is much quicker, smooth as silk and better on mileage. Oh, and one of those little tubes under the air clnr assy was pinched. Tomorrow morning I'll know how it is regarding the high idle-kick down issue.


Romans 8:2
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Offline philo_beddoe

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Another question on timing-
« Reply #63 on: December 26, 2015, 07:42:00 pm »
Quote from: blazer74 on December 26, 2015, 10:24:29 am


Here's a hot air style with the arrows. Lean is less rich is more tension.

Full or ported. What works best for you?  I run full manifold. I have run it both ways. Lots of info on here about that. It's about idle quality cause once you hit the gas vac goes away until rpm's stabilize.

Like you said that's a discussion in its self and don't want to start a feeding frenzy.

You covered that on your other post anyways.
Wow, that totally makes sense, at first try I dialed it left and it started very chokey and chuggy and then I dialed it right and smoothed out nice. After trying it again if course.

And that is exactly how it ran, now that it's on full manifold, the standing idle is a little low I guess, but as soon as you go  it feels real nice.


Romans 8:2
« Last Edit: December 26, 2015, 07:46:45 pm by philobeddoe »
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Offline Greybeard

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Re: Another question on timing-
« Reply #64 on: December 27, 2015, 01:48:56 am »
You can always set the idle higher with the idle screw. Just not before the engine is fully warmed up.

Glad you got the timing sorted out. I would (ETA)>not< (I really need to proof read before posting) trust a young certified mechanic to work on these older trucks, they really aren't taught how to work on them. If the computer can't be flashed the knowledge peters out.
« Last Edit: December 28, 2015, 02:34:38 pm by Greybeard »
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Offline philo_beddoe

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Re: Another question on timing-
« Reply #65 on: December 27, 2015, 06:29:11 am »
I agree greybeard, its hard to find an old timer mechanic that was taught on the carbuerated engines. My brother in law is a mech and he says he cannot help me on the carb stuff, as he was taught on EFI. Wish i lived near rich weyand. Haha, (not that hes and old timer).
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Offline enaberif

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Re: Another question on timing-
« Reply #66 on: December 27, 2015, 09:30:07 am »
Timing a engine is not that hard. There are a few basic rules to follow and from there it's just finding out where the truck performs the best under most conditions.

You can get super technical if you want but it's not necessary.
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Offline philo_beddoe

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Re: Another question on timing-
« Reply #67 on: December 27, 2015, 12:42:03 pm »
Thats right, some guys can do it all by sound and feel. It does make sense.


Romans 8:2
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Behold, the day of the LORD cometh, and thy spoil shall be divided in the midst of thee.  Zechariah 14:1

Offline enaberif

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Re: Another question on timing-
« Reply #68 on: December 27, 2015, 01:16:08 pm »
Quote from: philobeddoe on December 27, 2015, 12:42:03 pm
Thats right, some guys can do it all by sound and feel. It does make sense.


Romans 8:2

Incorrect. You can't properly time a vehicle by ear or feel. You might be able to get it close but it won't be proper.
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Offline philo_beddoe

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Re: Another question on timing-
« Reply #69 on: December 27, 2015, 07:45:14 pm »
Only going by what i've heard. I use a light.
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Offline Irish_Alley

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Re: Another question on timing-
« Reply #70 on: December 27, 2015, 07:51:30 pm »
in a pinch ive done it by ear when i was ignorant, now i keep a timing light in my tool box lol.
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Offline philo_beddoe

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Re: Another question on timing-
« Reply #71 on: December 27, 2015, 09:53:26 pm »
After 30 years of setting timing i bet rich weyand can do it by ear, better than a light. Ha!
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Offline enaberif

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Re: Another question on timing-
« Reply #72 on: December 27, 2015, 10:12:56 pm »
Quote from: philobeddoe on December 27, 2015, 09:53:26 pm
After 30 years of setting timing i bet rich weyand can do it by ear, better than a light. Ha!

Doubt it!
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Offline philo_beddoe

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Another question on timing-
« Reply #73 on: December 28, 2015, 01:13:51 pm »
Well i had to tweak the warm engine idle, other than that, it finally kicks down real nice during the cold fast idle. First it drops a level then right down to a nice purr. And now that the timing is right, and the hoses are back where they are supposed to be, she feels like a butterfly with a 454. Well, maybe not a 454. More like a 305 pulling out of the dealer lot in 1977.  Yeah thats it.

Ps. I'm convinced manifold vac is where its at!

http://forum.73-87chevytrucks.com/smforum/index.php?topic=32085.msg270444#msg270444
« Last Edit: December 28, 2015, 01:19:13 pm by philobeddoe »
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Offline enaberif

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Re: Another question on timing-
« Reply #74 on: December 28, 2015, 01:52:55 pm »
Quote from: philobeddoe on December 28, 2015, 01:13:51 pm
Well i had to tweak the warm engine idle, other than that, it finally kicks down real nice during the cold fast idle. First it drops a level then right down to a nice purr. And now that the timing is right, and the hoses are back where they are supposed to be, she feels like a butterfly with a 454. Well, maybe not a 454. More like a 305 pulling out of the dealer lot in 1977.  Yeah thats it.

Ps. I'm convinced manifold vac is where its at!

http://forum.73-87chevytrucks.com/smforum/index.php?topic=32085.msg270444#msg270444

Care to say that again please.. You mean the idle dropped on its own without user intervention ;) Of course it did. That is how they are SUPPOSED to work :D
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