can a pcv line connect to

[madvette74]

I have no other vacume source, except the powerbrakes. other than very sma;; port for dist. can I hook the pcv line onto the power brakes?

 

[yellow77]

Dont recommend it, the vacuum will be low due to the flow back from the pcv valve. Is there no other port on the intake you can put a fitting into?

 

[vette-dude]

I have no idea what kind of manifold or year car you have but most stock SB have a threaded plug right behind the rear of the carb in the manifold that can be used as a vacuum source. I think it is a 3/8 pipe plug and you use a breaker bar that fits the square to remove it. This will work to provide vacuum for the brakes.

Randy

 

[L48]

I have no other vacume source, except the powerbrakes. other than very sma;; port for dist. can I hook the pcv line onto the power brakes?

Are the power brakes attached to the intake or the carb? What is your intake/ carb set up that you have only one source of vacuum?

If you are worried about vacuum, make the connection and put a vacuum gauge on the line headed to the brakes. If the vacuum reading is good then you should be good to go.

 

[RodsnRides]

Don't know your intake/carb setup, but if it's a Quadrajet there should be a tap at the back of the carb for a vacuum source. Most are used as the power brake line. There should be a 3/8" tap at the front of the Q-jet (between the mixture screws) for PCV. Most carbs have a 3/8" tap for PCV, most intakes have a fitting for your power brakes. Can you elaborate on your setup-and maybe we can be more helpful?

Rick

 

[madvette74]

it has a airgap manifold and a holley 750dp the only fitting on the manifold for vacume sits just under the rear fuel bowl, absolutley noway to get a fitting in there..

 

[RodsnRides]

Dang-that's too bad. I didn't realize a Holley 750 DP does not have provision for PCV. Are you sure you have no hose barb on that carb? Or, at least, a plugged port at the base of the carb that you can remove the plug and screw in a hose barb for PCV?

The suggestion to "T" into the power brake hose is the way to go, I guess. I might suggest the next time you have the intake off, drill and tap for a fitting at a suitable location.

You may also want to run a vacuum canister (for big cams) to ensure you will have adequate reserve for your brakes. Hope this helps...

Rick

 

[Jack]

it has a airgap manifold and a holley 750dp the only fitting on the manifold for vacume sits just under the rear fuel bowl, absolutley noway to get a fitting in there..

So ... exactly where is the vacuum source that is currently pulling your brake booster?
JACK:gap

 

[waterboy1976]

hey guys....I have the same setup with a Demon 650 and an Air Gap.....I drilled and tapped the side of the manifold and inch below the carb baes and ran one fitting off of there for the brakes and lights and then the fitting on the back of the carb hooks to the PCV....


email me and Ill send you pics if you like.

Rob

 

[madvette74]

sent you mail Rob..

I just have a usable source on the rear of the carb..

 

[JohnZ]

Edelbrock makes a low-profile brass vacuum fitting specifically for that Holley application, that fits underneath the rear float bowl.

 

[madvette74]

http://

here is a tight fit

 

[madvette74]

johnZ do you have a part number for the edelbrock fitting?

 

[waterboy1976]

edelbrock fitting doesnt work....Ill send you one.......I have a new one in the box....thats why I tapped the side.......

MAD....sent you email with pic.....

 

[waterboy1976]

I ALSO have this fitting from Mo-speed...havent tried to put it on yet.......then Ill plug the side of the manifold....


http://www.c3sharktank.com/tech2/vacfitting/index.html
Its a nice piece......but I havent tried it yet.......the Edelbrock one is STILL too tall......you need a 1/2 inch carb spacer but then you have ood clearance problems if you dont have a BB hood...

 

[madvette74]

waterboy76.

thanks for the mail, do you have mo-speed website part number and or phone number?
thanks

 

[waterboy1976]

on that link the part # is listed....Ill find their phone number for you....May be tomorrow morning by the time I get back to you though.....#'s at home....

Cya

 

[madvette74]

thanks..

 

[waterboy1976]

ok......I BLEW UP THE PIC ON THE BOX IN THE FIRST FRAME...THEIR PHONE # IS .....417-724-2118....I remember thats how I got it too...cause their website isnt working........good guys.....nice part.......PART # 5183.....havent put mine on yet but it LOOKS like itll work...?!?!?!


Rob

 

[JohnZ]

The Mo-Speed fitting looks like a great solution - a part whose time has come.