All Small Six pcv valve location

[Little 200]

After seeing the post about pcv valve connection point can the hose be tied in at the threaded hole under the carb in the log ? The thing is that i have a brake booster line already attached there . Will it hurt the booster if i put a two connection in the log and attach both the pvc and booster to same threaded hole ?Thanks to all !

 

[DoctorC]

I T'ed mine to the intake log.

Blow by?

Do a hot cranking compression test. You can do a leak down test, but i believe its time for a visit to your machine shop.

fordsix.com

 

[Frank]

After seeing the post about pcv valve connection point can the hose be tied in at the threaded hole under the carb in the log ? The thing is that i have a brake booster line already attached there . Will it hurt the booster if i put a two connection in the log and attach both the pvc and booster to same threaded hole ?Thanks to all !

Good morning. If the PCV and brake booster share a vacuum source, there will be some loss of vacuum to the booster, since the PCV bleeds air into the manifold whereas the booster is static. It may not be enough vacuum drop to noticeably affect braking performance, but this is not ideal. Also, and of more significance: over time oily residue will be drawn up the booster line, eventually reaching the booster. If there is another workable solution, find it. I would not recommend a shared source for these two components.
The hole in the manifold is a good source for PCV- but just not connected directly into the braking system.

 

[chad]

some use a fitting @ carb base for this, the 1 U use cont for brake.
Details on request

 

[clochard68]

Good morning. If the PCV and brake booster share a vacuum source, there will be some loss of vacuum to the booster, since the PCV bleeds air into the manifold whereas the booster is static. It may not be enough vacuum drop to noticeably affect braking performance, but this is not ideal. Also, and of more significance: over time oily residue will be drawn up the booster line, eventually reaching the booster. If there is another workable solution, find it. I would not recommend a shared source for these two components.
The hole in the manifold is a good source for PCV- but just not connected directly into the braking system.

Shouldn't the vacuum prevent the residue from getting to the brake booster? I think even the brake booster inlet is higher than the vacuum attachement point on the intake manifold...

My selfmade PCV inlet is in the carb adapter over the log, and transmission and brake booster share the original threaded hole in the log manifold.

 

[Frank]

Shouldn't the vacuum prevent the residue from getting to the brake booster? I think even the brake booster inlet is higher than the vacuum attachement point on the intake manifold...

That's a great question, to which all human logic would say yes. Ironically, the opposite is how nature actually operates. When a vacuum is applied to an air space with a colloidal dispersion in it (small droplets of a heavier-than-air- material), the suspended droplets are drawn to the outer edges of the vacuum. The do-it-yourself windshield repair kits demonstrate this well. Glue is placed over the indention or crack in the glass, but just sits there. The suction-cup applies vacuum- away from the windshield. The vacuum pulls out- the glue pulls into the crack. If you think about this carefully, it does not make logical sense. The fact of fuel puddling in cold carb intakes is not merely the cold walls, but the fact that when vacuum is increased (deceleration), the fuel is drawn to the manifold walls by natural (illogical) design. There are some older threads in the Big Six where engine oil was collecting in the throttles, and even back toward the air filter (EFI). The source was the PCV inlet into the intake, 15" and a big plenum away from the throttles. When the vacuum is low (accelerating) and suddenly rises (deceleration), the crankcase vapors stop being drawn into the runners, and are immediately pulled backward toward the throttle blades.
Back to the brake booster- if the vacuum source was in a steady state, no oil would be drawn toward the booster. But it's far from it, of course, in an engine. When the vacuum is high, the air is sucked out of the hoses. The moment it drops (accelerating), air is reinserted into the hose. If the only air available for reinsertion into the hose is full of oily mist- that mist is traveling up the hose toward the booster. The next time vacuum goes up (decelerating), the oily particles are accelerated toward the outer edges of the vacuum source, they don't all get sucked back out. A significant % of condensed oil residue will adhere to the rubber vacuum line. It would not take long before it is all the way to the booster.

 

[chad]

carb base, carb itself (below/above butterfly), further below on log.
One must locate @ optimal as there's pcv, b. booster AND auto transmission modulator valve line.
(any left off the lists? any that shouldn't B there? well, may B - as none go to above butterfly).

 

[clochard68]

Frank, that's true, I never thought about that tbh...

My setup is as shown in the picture with the PCV into the carb spacer (blue) and the brake booster/transmission into the manifold (red). Would that be ok or should I switch top and bottom?
Now I'm kind of concerned that residue from the PCV at the top (blue) might get sucked into the bottom (red).

So much to consider, I always read some new infos here on the forum that make me second guess everything but thank you all for the knowledge you share!

 

[Frank]

Frank, that's true, I never thought about that tbh...

My setup is as shown in the picture with the PCV into the carb spacer (blue) and the brake booster/transmission into the manifold (red). Would that be ok or should I switch top and bottom?
Now I'm kind of concerned that residue from the PCV at the top (blue) might get sucked into the bottom (red).

So much to consider, I always read some new infos here on the forum that make me second guess everything but thank you all for the knowledge you share!

Thanks- I like to think things out, but with age I'm learning that the limit to thinking things out is when I begin second-guessing. A man I look up to wrote, "if there's doubt- don't." Whenever second-guessing starts, quit thinking about it and let the dust settle.
As for your set up, it is correct as it is IMO. I would leave it because 1) the PCV is feeding an oily airstream into the engine at all times, and it's dispersed evenly into the runners from it's current location. 2) Only a small % of the PCV residue passes over the brake booster port, and it's mixed with fuel droplets which will keep it suspended better, less likely to "cling" to the soft rubber hose. No mater what some fuel/ PCV residue tracks up every vacuum line, but rarely causes adverse effects.
The objection I had was to PCV and booster sharing the same port, thus leaving a high concentration of oily air at the intake point for the booster.

 

[Little 200]

Frank, that's true, I never thought about that tbh...

My setup is as shown in the picture with the PCV into the carb spacer (blue) and the brake booster/transmission into the manifold (red). Would that be ok or should I switch top and bottom?
Now I'm kind of concerned that residue from the PCV at the top (blue) might get sucked into the bottom (red).

So much to consider, I always read some new infos here on the forum that make me second guess everything but thank you all for the knowledge you share!

Clochard 68 do you remember where you got the spacer with the vacuum port ? that is what i am trying to find .

 

[Little 200]

clochard 68 the spacer you show is what i am trying to find . Do you remember who you got that from ?

 

[clochard68]

Hello,

The carb adapter is a 2 piece adapter I bought from carburetors unlimited and modified for my weber (I used only the lower part of the adapter).
To get the PCV inlet I drilled a 11.5mm core hole into the adapter with a drill press, and then carefully cut a ¼ NPT thread by hand for the brass fitting. I made sure to go slow with the drill and to use lots of cutting oil in both working steps.

Here is a picture of the adaptor, I guess you can get one like this from other vendors also:

 

[chad]

clochard 68 the spacer you show is what i am trying to find . Do you remember who you got that from ?

oem Ford. Here's 1 from Matt:

65-67 MUSTANG Carburetor Spacer, 6 Cyl | Vintage Inlines

Replace your corroded or leaking original 1V carb to intake adapter.

www.vintageinlines.com

mpre at:

www.vintageinlines.com-Carb Adapters

Carburetor Adapters and conversion adapters

www.vintageinlines.com