Another question on timing-

[blazer74]

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.

[Irish_Alley]

http://forum.73-87chevytrucks.com/smforum/index.php?topic=32085.0

[philo_beddoe]

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

[philo_beddoe]

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

[Greybeard]

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.

[philo_beddoe]

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).

[enaberif]

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.

[philo_beddoe]

Thats right, some guys can do it all by sound and feel. It does make sense.


Romans 8:2

[enaberif]

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.

[philo_beddoe]

Only going by what i've heard. I use a light.

[Irish_Alley]

in a pinch ive done it by ear when i was ignorant, now i keep a timing light in my tool box lol.

[philo_beddoe]

After 30 years of setting timing i bet rich weyand can do it by ear, better than a light. Ha!

[enaberif]

After 30 years of setting timing i bet rich weyand can do it by ear, better than a light. Ha!

Doubt it!

[philo_beddoe]

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

[enaberif]

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