Weird really HELP!
Elder User
Joined: Dec 2007
Posts: 813
Likes: 6
From: Up Nort Minnesota
so when you unhook it and plug the line it runs good or does it run good open & sucking air?
You can test the vac advance by blowing or sucking in a vac line plugged into the vac advance. if the diaphram is torn you'll be able to blow or draw air through it. if you can't get any air to pass through it then it's fine.
You can test the vac advance by blowing or sucking in a vac line plugged into the vac advance. if the diaphram is torn you'll be able to blow or draw air through it. if you can't get any air to pass through it then it's fine.
Elder User
Joined: Dec 2007
Posts: 813
Likes: 6
From: Up Nort Minnesota
have you tried plugging it into the front port?
I've honestly never seen a vac advance like that one before. But it seems to me that pulling vac on the back side of the diaphram would turn it into a vac retard instead of a vac advance.
I've honestly never seen a vac advance like that one before. But it seems to me that pulling vac on the back side of the diaphram would turn it into a vac retard instead of a vac advance.
Elder User
Joined: Dec 2007
Posts: 813
Likes: 6
From: Up Nort Minnesota
well that aint good.
seriously tho, i don't understand the twin port vac advance.
If you can blow through it you better just plug the line for now.
I guess I would think it should be timed at around 10 degrees before TDC at idle with no vac (and prior to any mechanical advance coming in)The vacuum would maybe bring it up to 16.
you mentioned something about see if it starts good hot.
does it start hard when it's warm?
usually means too much advance in the timing
seriously tho, i don't understand the twin port vac advance.
If you can blow through it you better just plug the line for now.
I guess I would think it should be timed at around 10 degrees before TDC at idle with no vac (and prior to any mechanical advance coming in)The vacuum would maybe bring it up to 16.
you mentioned something about see if it starts good hot.
does it start hard when it's warm?
usually means too much advance in the timing
Elder User
Joined: Dec 2007
Posts: 813
Likes: 6
From: Up Nort Minnesota
Sorry for hackin on you about the P-valve swap. I guess I forgot how fast I used to do things.
Christ, we would change engines in no time back in the day. I remember me & a friend changing out 302's in a T-bird with no engine hoist of any kind. we just got inside there & lifted it out & over the radiator. put the swap back in the same way & it didn't take too long.
god I've gotten old.
Christ, we would change engines in no time back in the day. I remember me & a friend changing out 302's in a T-bird with no engine hoist of any kind. we just got inside there & lifted it out & over the radiator. put the swap back in the same way & it didn't take too long.
god I've gotten old.
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Elder User
Joined: Dec 2007
Posts: 813
Likes: 6
From: Up Nort Minnesota
try plugging it in the front port?
drawing vac on the front side is going to pull the advance inkage, rotate the point base plate & advance your timing.
is there no vac port on the front passenger corner of this carb? down low?
drawing vac on the front side is going to pull the advance inkage, rotate the point base plate & advance your timing.
is there no vac port on the front passenger corner of this carb? down low?
Elder User
Joined: Dec 2007
Posts: 813
Likes: 6
From: Up Nort Minnesota
in this pic it seems like I can see a vacuum port right under that square tin plate in front of your choke.
That's gotta be the guy that goes to the front side of that vacuum advance. (unless I'm seeing something that aint there)
Thread Starter
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Senior User
Joined: Nov 2009
Posts: 125
Likes: 0
I am blind I didn't see it! A shade tree mechanic installed this motor
Elder User
Joined: Dec 2007
Posts: 813
Likes: 6
From: Up Nort Minnesota
I'm still trying to wrap my brain around the twin port vac advance
The damn thing must do a tug of war between timed & manifold vacuum. Maybe it has no spring inside & just uses vacuum for a return? Hell I don't know.
very interesting, I'll have to research that one tomorrow.
Good luck, you'll get it tuned in, you've got ambition that's for sure.
I gotta go to bed.
The damn thing must do a tug of war between timed & manifold vacuum. Maybe it has no spring inside & just uses vacuum for a return? Hell I don't know.
very interesting, I'll have to research that one tomorrow.
Good luck, you'll get it tuned in, you've got ambition that's for sure.
I gotta go to bed.