vacuum tree (PVC) question

[Anonymous]

my PVC tree...has three nipple (goldfinger)...one line goes to the vaccuum advance on top...one line goes to the advance on the side....and is t-lined to carb base....and the third is closed off with a short hose tied closed

is this correct?

I cant find any literature on it...my book doesnt seem to explain exactly where these lines go.....

I am trying to see if my vaccuuum is why my gas milage is somewhat low...

chaz

 

[CobraSix]

If you don't need it, then you shouldn't have it hooked up.

I'm assuming you still have a dual vacuum advance dizzy? Either way something is wrong.

The ported vacuum from the carb should go to the one on the side, and manifold vacuum goes on top (or do I have that reversed anyone?). If you have single advance...then you are doing something wrong...hehe.

I'm not sure why you'd have the manifold vacuum going to the carb. Only the PCV (which is from the valve cover) is routed to the carb base.

So for my current set up, I only have the PCV hooked to the carb, and the carb to the dizzy. my vacuum tree is all closed off.

Slade

 

[Anonymous]

I FORGOT TO MENTION I do ALSO have a hose from back of vavle cover to carb base.

I have the dual dizzy...

what does the tree-thingy from just behind the waterneck go to?

and if I have the dual dizzy vacuum lines....one to the carb....and....????

 

[pedal2themetal45]

HI YA SPONGIE

" what does the tree-thingy from just behind the waterneck go to? "

The tree-thingy was used to not alow vacuum to certern items untill the motor warmed up it was a tempature control divice. It may have been hooked up the the dizzy to not alow full advance when cold.. I try the hook up like Corbra stated and if it don't sound right swap the lines and see what happends.
tim

 

[Anonymous]

update: thge valve cover hose goes to carb base

The water neck (with pcv tree) goes to
1) bottom one is clamped off
2) middle one goes to top of dual advance dizzy
3) top one goes to a t-line which goes to a) advance of carb and b) intake manifold

this seems wrong

i have pictures if anyone wants to host or look at

 

[Anonymous]

I can host them and post them here if you want me to.

 

[simon]

Listen to Slade.

Unless you´re planning for MCA judge points, you don´t need the vacuum control valveor, as ford called it, ported vacuum switch at all.

want MCA points? read below




...



original configuration of 1968 IMCO emission connections for 170-200", auto transmission and/ or thermactor:

- PVS bottom outlet is connected to filter unit
- PVS center outlet is connected to rear of dual vacuum advance canister (green stripe on vac. line)
- PVS upper outlet is connected to a "T", which is connected to air bypass valve on one side and to intake manifold accessory outlet on the other side (red stripe on vac. line).

- front of dual vacuum advance canister is connected to timed vacuum port on carb

 

[Anonymous]

ok...

so where is the REAR of a dual vacuum advance canister? is that the TOP of the vaccuum advance on the distributor?

my t-line is connected to the intake manifold on one side...whihc is correct...and WHERE is the air bypass valve? Is that the plunger of the distributor advance?

by BOTTOM line plugged which seems correct

i have a holley carb...i think its the 1946...so
the FRONT of the dual vacuum advance...would go where....and what is considered front?

 

[simon]

hiya chaz...

you really want to keep the dual vac?

cool... ´nother old timer, just like me...

I posted that a while back, that should help you out:

and remember, top outlet from the vacuum tree goes to manifold vacuum.

 

[Anonymous]

wow...thanks Simon...I am gonna make sure I am just like this drawing

does any holley carb owners know if it does have a port?

again...thank you

chaz

 

[Anonymous]

found a leak....kinda


I have a choke on the front of the carb (just above the gas connection)....and it has a threaded adaptor...that is sucking air with nothing attached to it...is this supposed to go to the choke heat tube?....

the tube that is supposed to come off the manifold to the top of the vacuum tree....has a t-line and goes to THE HORIZONTAL port on my distributor...thats not right, its it?

please help. I think this is my bad gas milage problem

carb says Motorcraft on side

 

[Titleist16]

Hey Simon, could you post a drawing of the same thing but for a single advance going to an Autolite 1bbl? There is a vacuum line on my carb that's blocked off and I don't know if it should be blocked off. I'm trying to figure out why my car gets such terrible gas mileage (about 8 mpg). This is in a 62 Comet with a 68 block,69 head, 66 exhaust manifold if you need any of that info. Thanks

 

[simon]

Titleist16:

Originally, the autolite1100 was designed to work with a matching vacuum-only advance distributor, called the load-o-matic system.

Do you have a dual advance (vacuum canister outside and mechanical centrifugal advance inside the dizzy housing, under the breaker plate assembly)?

 

[Anonymous]

I do indeed have the dual advance...and it seems to have been set up wrong

this morning, before the commute...I did what was said here...I had to steal some parts off an old carb I had. The sucking noise is now virutally gone. Installed a heat riser tube that was non existent (including nipple).

and Ifound another nipple that I put in the SIDE of the carb....before it was just a screw hole...so I screwed in the screw with the nipple on the other side...attached the horizontal advance to that with a new vacuum line.

Took the tline out and ran the the middle "tree" nipple to the TOP of the advance

ran the TOP line to the mainfold

and drove to work

these settings made
1) my car run quieter
2) made me realize my choke was set wrong
3) made my car run HOTTER (temp gauge)
4) seemed to be smoother
5) I think my smoke is gone

I am thinking that before, my car was always running in the choke mode...thus making it RICH...thus the black smoke.

time will tell...but...THANK YOU. something different...maybe prigress

I thought it was carb related

 

[pedal2themetal45]

HI SIMON
I was looking at your digram and it don't seam right??
On the digram of the Tree you have the bottom line going to the air filter That can't be right it has to conect to the motor some way (don't it?) not just the air filter or your going to get a vacuum leak theirs not that much vacuum in the air cleaner espciauly at idle? Unless it hooks up to a vacuum pod that opens a heat exchanger that open the air filter to a heat tube off the exhaugst manifold.
I have seen some that go to the air cleaner to a little pod then go back to the carb.
Just my .02
Tim

 

[Anonymous]

man, I wish I could find my shop manual on cd....I misplaced it

update: at lunch, my car wouldnt stay started. I adjusted the timing a little and the idle and it started up. Its running cooler now. I still am not sure if the advance is right at high speeds

anyone have a holley/motorcraft carb? can you tell me where the vacuum line goes?

 

[simon]

On the digram of the Tree you have the bottom line going to the air filter

I just checked that in my mitchell manual, can´t see anything wrong.

like on chrysler TIC, the Ford PVS is usually set up like that:
lower port: filter/ air cleaner
center port: "D"-port, distributor vacuum canister, retard side
upper port: manifold vacuum

So, the warmer the engine gets, the less the retard diaphragm of the distributor is actuated. If you hook the lower port up to manifold vacuum, you´ll always get vacuum to the retard side of the distributor vacuum canister. The PVS would be useless then, like a switch reading "on/ on"

The PVS task is to slowly cut off engine vacuum for the retard canister at high temperatures, thus permitting full distributor vacuum advance at idle and increasing engine idle speed.

Ford originally designed it to eliminate engine overheating at prolonged idle.

 

[simon]

Chaz, what holley/ motorcraft carb do you have exactly?

 

[Anonymous]

if I had it to wrong ports, that could have caused my bad gas milage...right?


when I say "I"...it was hooked up that way from PO..a.nd the mekanik didnt change it....strange

 

[Anonymous]

i think its the 1946...I got it off of John Propes on here. I just PM'ed him asking if it was a 1946...I think it is

why, do you have any schematics for it?