Vacuum advance - to use or not

[Cudaah]

I have heard different opinions about running vacuum advance or not.  What is the recommendation out here?  What are the advantages or disadvantages of running it.  I am running a crate 360/380 with a 4.10 gear and 3K stall.  My timing is set at 36.25 @ 2200 RPM at the moment without vacuum advance.

[AMXguy]

I'll let you know after I get my didtributor back from being curved to run the vac advance. the advantage as I'm told is better efficiency and smoother operation but not really a performance gain.  I had to do something to get my curve better so I decided to try the vac advance on the shops advice, I don't see how it will hurt anything if you're curved proper.

[GoodysGotaCuda]

Its used for better cruise mileage. Taking it out will see, usually a 1-2mpg drop. Leaving it in you'll get better mileage, just something else you may need to adjust when setting your timing up.

[Cudaah]

Oh yeah I forgot to mention on am using the MP ectronic ignition kit with the orange box

[Chryco Psycho]

not using vacuum adavance  allows higher initial timing so it will run better with higher duration cams etc

[74 340 4speed]

not using vacuum adavance  allows higher initial timing so it will run better with higher duration cams etc

Exactly.  I have mine plugged off.  My car runs better without it.

[matt63]

not using vacuum advance  allows higher initial timing so it will run better with higher duration cams etc

Agreed and if I'm not mistaken the crate 380 has a nasty cam.

[AMXguy]

How do you guys get away with that without your total coming in too fast? I tried a bunch of springs and no matter what I did if I set my initial up where it needed to be then I was all in at 1800-2000 and it ran like crap if I didn't keep the rpm up under load. I would have liked to not messed with the vac advance but I just couldn't get there from here without it.  if it doesn't run as promised when I get my distributor back I might try it again but I hope this does it.

[MEK-Dangerfield]

I just started useing the vacuum advance this year. I needed to tweak the pod down some, as I was gettng too much adavance at cruising speed. I went from 12.2MPG Hiway, to 13.3MPG. Hey, it was at 65-70MPH with a  440, so I'm not complaining. 


  Mike

[Cudaah]

thanks for everyones input!

[ViperMan]

I needed to tweak the pod down some...

What is a pod?

so I'm not complaining. 

Geez, for once!  lol - j/k

Jeff

[hemiken]

Hey Jeff,


The guys are talking about the vacuum canister on the distributer buddy.

[Chryco Psycho]

you can adjust the vacuum advance , there is an allen screw inside the pot , turning counterclockwise reduces advance by approx  1* / turn

[GoodysGotaCuda]

1* per full allen revolution? I may hook mine back up, add a couple degrees in while at cruise.