Vacuum Advance? Do we need it?...
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Joined: Jan 2001
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From: S. Mississippi
Vacuum Advance? Do we need it?...
My 82 F-150, seems to not like having the vacuum advance hooked to the carb. When its connected it clatters. Without it connected it runs way better.
Is it alright to run a 300 without the advance if i have no pinging? I can rev it up while in park, or drive, and hear no noises except that big ole' six making revs.
On the highway, i can run it up to about 60 mph and let off the gas and not hear anything, except the engine decelerating.
Setting the timing so that i have to run the advance, makes the engine a down right PIG. No gumption what so ever, and no fuel mileage.
Its increased some since i disconnected the vac advance.
Anybody got any suggestions as to why i'd need the vac advance anyways?
Is it alright to run a 300 without the advance if i have no pinging? I can rev it up while in park, or drive, and hear no noises except that big ole' six making revs.
On the highway, i can run it up to about 60 mph and let off the gas and not hear anything, except the engine decelerating.
Setting the timing so that i have to run the advance, makes the engine a down right PIG. No gumption what so ever, and no fuel mileage.
Its increased some since i disconnected the vac advance.
Anybody got any suggestions as to why i'd need the vac advance anyways?
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Joined: Dec 2002
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From: McChord AFB
Vacuum Advance? Do we need it?...
well vacume advances are for econimy perposes. They give you advacne at middle range. As far as i know the 300 should have the cintrifical advacne as well. Just make shure it does, unplug the vac and put a timing light on it then rev it and if the mark still moves your golden. As far as i know performance distributors only uses weights to advance the timing.
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Posting Guru
Joined: Jan 2001
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From: S. Mississippi
Vacuum Advance? Do we need it?...
yea, most aftermarket dizzy's use centrifugal advance with no vac.
this truck, even without the vac advance should pull some good numbers, considering i've only got 2.47's in the rear (according to the rear end id tag.)
I don't have a timing light, so i can't check and see if its good or not without it..
But i do know it runs a lot better than before.
this truck, even without the vac advance should pull some good numbers, considering i've only got 2.47's in the rear (according to the rear end id tag.)
I don't have a timing light, so i can't check and see if its good or not without it..
But i do know it runs a lot better than before.
Elder User
Joined: Dec 2002
Posts: 738
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From: McChord AFB
Vacuum Advance? Do we need it?...
if it runs better go whith it. In my oppinion vac lines are just peices of garbage. But then again i off road alot so if i have motor problems i whant to be able to get at everything easilly, not wade through spegeti.
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Posting Guru
Joined: Jan 2001
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From: S. Mississippi
Vacuum Advance? Do we need it?...
I can feel you there, I've got one vaccum line that goes to the vac advance, and one that goes to my brake booster, other than that, i'm vac line free, no EGR. (the vac port has been plugged off.)
I think i'll stick with my Mech advance only, until i get a new distributor.
I think i'll stick with my Mech advance only, until i get a new distributor.
Postmaster
Joined: May 2002
Posts: 3,241
Likes: 3
From: Broken Arrow, OK
Vacuum Advance? Do we need it?...
Do you have it hooked to manifold or ported vacuum? The two create very different driving characteristics. If you run it to manifold, it will drop timing when you hit the gas. If you run it to proted it will add timing as rpms increase.
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