Just needing some help

-
I

Inhishands21

Member
Joined
Nov 11, 2024
Messages
19
Reaction score
16
Location
Tennessee
I inherited a 1969 dodge charger from my grandfather. He bought it new, and had it worked on several times. I believe he said it was rebuilt twice. Last rebuild was because previous mechanic left shop rag in distributor hole when he installed the new distributor. Anyway, the car runs very rough. I can adjust the timing and get it to idle smoothly at 950 rpm, but when I reconnect vacuum advance it jumps to 2300. What am I doing wrong? (I'm just a farmhand with general knowledge of mechanics and keep it running smarts) My main love is the animals, but I don't want to throw away a good vehicle if I can fix it.
 
Sounds like whoever messed with it last had the vac advance connected to manifold vacuum instead of ported
 
Not that I'm much help but that's pretty much how to differentiate Magnums from LA engines.
 
Inhishands21 said:
??
Click to expand...

Doesn't really mean anything other than terminology. It doesn't help your situation other than trying to inform you how Chrysler does it. Magnum motors are designated in liters and NON magnum blocks (LA engines) are designated in cubic inch.
 
IMG_8185.jpeg
 
You have timing coming from both vacuum advance and mechanical advance... When you plug the hose in to the vacuum port it brings in timing, that timing causes the rpm's to increase, when the rpm's increase that causes the mechanical advance to bring in more timing..... Which causes the rpm's to climb even higher....

The problem is originally the vacuum advance was connected to ported vacuum, that means there is no vacuum at idle, it starts coming in at around 1200 rpm's....
The port on the side of the carb is manifold vacuum, depending on your actual carb there is probably a ported vacuum source on the front edge of the base plate...

FWIW Sorry to hear of your grandfathers passing but he left you a cool car that should remind you of him for years to come..
 
1WildRT said:
You have timing coming from both vacuum advance and mechanical advance... When you plug the hose in to the vacuum port it brings in timing, that timing causes the rpm's to increase, when the rpm's increase that causes the mechanical advance to bring in more timing..... Which causes the rpm's to climb even higher....

The problem is originally the vacuum advance was connected to ported vacuum, that means there is no vacuum at idle, it starts coming in at around 1200 rpm's....
The port on the side of the carb is manifold vacuum, depending on your actual carb there is probably a ported vacuum source on the front edge of the base plate...

FWIW Sorry to hear of your grandfathers passing but he left you a cool car that should remind you of him for years to come..
Click to expand...
Thank you. Those were my thoughts exactly. (FWIW)
 
Yep as someone mentioned above, the engine may have been tuned for manifold vacuum, and then you attached to ported vacuum and it caused the timing to go higher. I'm not familiar with timing ports on 2bl carbs. More knowledgable people will help you out.
Super clean engine bay!
Show the rest of the car!
 
Okay, the yellow port connects to the choke pull-off which is green... Vacuum advance connects to the nipple that should be near the blue arrow under the float bowl...

Oh, if you decide to throw it away, throw it my way... LOL...


GetAttachmentThumbnail.jpg
 
4spdragtop said:
Yep as someone mentioned above, the engine may have been tuned for manifold vacuum, and then you attached to ported vacuum and it caused the timing to go higher. I'm not familiar with timing ports on 2bl carbs. More knowledgable people will help you out.
Super clean engine bay!
Show the rest of the car!
Click to expand...
Installing new plugs this morning

20241112_095803.jpg


20241112_095748.jpg


20241112_095741.jpg


20241112_095718.jpg


20241112_095710.jpg


1731423597113710339331629963728.jpg


17314236190062459547533900018249.jpg
 
You must log in or register to reply here.
-

Back
Top