Vecuum line to the distributor
Freshman User
Joined: Jul 2002
Posts: 40
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From: midwest
Vecuum line to the distributor
I have a 76' F250 with a 360 in it and when i rebuilt the 2bbl, it made a point to note that the distributor should go into the very bottom vaccuum hole(not pcv valve hole). The only thing that should be running to the intake is if you have power brakes:-).
Lead Driver
Joined: Nov 2000
Posts: 6,625
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From: Albuquerque
Vecuum line to the distributor
Generally speaking manifold vacuum is the best and easiest to deal with when tuning your advance. Ported vacuum was used for emission purposes and doesn't supply vacuum to advance the distributor untill the throttle is part way open.
Posting Guru
Joined: Feb 2002
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From: Atlanta, Georgia, USA
Vecuum line to the distributor
Try it both ways, do 1 tank of gas on the manifold, and 1 tank at a timed port above the throttle plates. See which one performs better, and which one gives better fuel economy, because every setup is different. In my own personal experience, I found the milage to be the same, but the performance is much crisper when hooked into timed ports above the throttle plates. Some people swear by doing it one way or the other, but you just gotta try it and see which one works for you. TK
'77 F100, 302 (the aftermarket Prodigy), C4
Cadet Second Lieutenant John F. Daly III
South Carolina Corps of Cadets, The Citadel
The TorqueKing
'77 F100, 302 (the aftermarket Prodigy), C4
Cadet Second Lieutenant John F. Daly III
South Carolina Corps of Cadets, The Citadel
The TorqueKing
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Elder User
Joined: Jun 2001
Posts: 775
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From: Northern Va
Vecuum line to the distributor
I understood the vacuum advance was supposed to advance the timing for better throttle response. If hooked to manifold vacuum, where vacuum is higher at idle and lower after the throttle is opened, the timing will retard on acceleration not advance as it should.
Unless the timing retards when the advance gets vacuum, it should be hooked up to the ported vacuum on the carb.
I may be wrong, but this is the theory I have used for 20+ years of mechanicing.
Unless the timing retards when the advance gets vacuum, it should be hooked up to the ported vacuum on the carb.
I may be wrong, but this is the theory I have used for 20+ years of mechanicing.
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Elder User
Joined: Jul 2002
Posts: 526
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From: USA
Vecuum line to the distributor
it has also been my experience that the vacuum should be connected to the ported vacuum, so the vaccum advace would work correctly. atleast thats the way all the cars i have ever seen come from the factory like. never heard of using full vacuum to the dist.
1977 F250 460
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1977 F250 460
C6 Hedman Headers
Dual 40 series
edelbrock performer
holley 4150
msd 6a and blaster coil
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Senior User
Joined: Jan 2001
Posts: 223
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From: Coquitlam, BC Canada
Vecuum line to the distributor
Its seems to be fine right now, but its not to hard to try it another way. So I guess I'll give it a try and see what happens.
Thanks everyone
Joe:-)
Thanks everyone
Joe:-)
New User
Joined: Jul 2002
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Vecuum line to the distributor
Most of the responses are right--use the ported vacuum off the carb and NOT the manifold. Ported vacuum applies after the carb plates open and thus provides vacuum across acceleration. Manifold vacuum actually decreases with accelleration and is highest at idle. High idle advance will or can cause hard starting and certainly poor performance.
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Senior User
Joined: Jan 2001
Posts: 223
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From: Coquitlam, BC Canada
Vecuum line to the distributor
That was a problem I was having was hard starting
, so tonight I switched the vacuum lines around. One from the carb to the dist. and the one from the snorkle switch to the manifold. I drove it aroung a bit and it seems to be a bit better I think the idle might be a little low but thats an easy fix.
got rid of that chrome air cleaner and put the stock oil bath back on, should be a whole lot better now
.
I guess I should get the timing adjusted to,
Thanks,
Joe
, so tonight I switched the vacuum lines around. One from the carb to the dist. and the one from the snorkle switch to the manifold. I drove it aroung a bit and it seems to be a bit better I think the idle might be a little low but thats an easy fix.got rid of that chrome air cleaner and put the stock oil bath back on, should be a whole lot better now
. I guess I should get the timing adjusted to,
Thanks,
Joe
Moderator
Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
Vecuum line to the distributor
If you have and original air cleaner that is full of oil, Then you have way too much blowby and your rings are shot!! hould be an aluminum housing with a paper element filter in it.
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Senior User
Joined: Jan 2001
Posts: 223
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From: Coquitlam, BC Canada
Vecuum line to the distributor
>If you have and original air cleaner that is full of oil,
>Then you have way too much blowby and your rings are shot!!
>hould be an aluminum housing with a paper element filter in
>it.
It is an oil Bath air cleaner trust me, its not oil from the motor.
This I was told was a option up until 79 I think it was. there is no paper element filter in it, it is a true oil bath air cleaner.:-)
>Then you have way too much blowby and your rings are shot!!
>hould be an aluminum housing with a paper element filter in
>it.
It is an oil Bath air cleaner trust me, its not oil from the motor.
This I was told was a option up until 79 I think it was. there is no paper element filter in it, it is a true oil bath air cleaner.:-)