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Old 06-05-2008, 06:32 PM   #1 (permalink)
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PVC's and Breathers

What's a good PVC and good Breather for our Ford engines??

I have a Schuck's PVC(flow rate might be less than a Motorcraft one) and a generic breather for now. Thanks.
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Old 06-07-2008, 12:49 AM   #2 (permalink)
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Re: PVC's and Breathers

it's Positive Crankcase Ventilation....PVC is Polyvinyl chloride, a kind of plastic :P
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Old 06-07-2008, 02:55 AM   #3 (permalink)
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Re: PVC's and Breathers

It has been recommended to me to walk into a GOOD autoparts store (Napa comes to mind) and ask for a PCV for a 60's BB performance car, such as a 1969 428CJ or any car with a 427 that came with one.

Unfortunately I haven't tried it yet so I can't pass on any good numbers.
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Old 06-07-2008, 06:18 AM   #4 (permalink)
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Re: PVC's and Breathers

PCV........my bad. Anyways thanks Dennis for the info. The flow rates for the BB Ford must be pretty big compared to a SB Ford.
As far as the breathers.....I wondered if a name brand like K&N would be better than a generic one.

Also Dennis.......what would be the most efficient way to connect the PCV...........to the manifold/spacer area or to the underside of the air cleaner lid(where it's at currently)?? I have a 1" spacer but it's like 1/2 inch thick and then 2 gaskets that are about 1/4 inch thick each. How big a diameter pipe thread connection is needed to go into the manifold/spacer area?? I'm thinking I could use a 3/8 or 7/16 diameter. What's your thoughts??
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Last edited by Spali32; 06-07-2008 at 06:25 AM.
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Old 06-07-2008, 09:31 AM   #5 (permalink)
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Re: PVC's and Breathers

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Originally Posted by Spali32 View Post

what would be the most efficient way to connect the PCV...........to the manifold/spacer area or to the underside of the air cleaner lid (where it's at currently)??
Just a reminder. Having the PCV inet drawing from an air cleaner does not supply the system with manifold vacuum. What you have is non-operational.

You draw fresh inlet air from the air cleaner.
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Old 06-07-2008, 05:43 PM   #6 (permalink)
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Re: PVC's and Breathers

Thanks Kultulz..........I will have to figure out where to tap into the intake manifold. It makes sense now. Thanks again.
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Old 06-08-2008, 10:50 AM   #7 (permalink)
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Re: PVC's and Breathers

Running a "PCV" into the carb base plate or into manifold could not be very performance oriented. Look at the money you spend on air cleaners,carbs, intakes, and such to get the most cold,fresh air to mix with the fuel. Add a "pcv" and now your injecting hot,oil contaminated air into your intake charge. But I too am looking for somthing different than just the push in breather,I just went to a rocker arm stud girdle which I had to buy new valve covers but even with the new "Tall" valve covers i cant use the baffles which means now I get oil coming out of my breather. Wysco makes a billet valve cover breather baffle that screws on with a locking nut if the mounting depth will clear i'm thinking of trying them.
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Old 06-08-2008, 05:46 PM   #8 (permalink)
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Re: PCV's and Breathers

I have been advised that this is the correct PCV system to use.

"The PCV requires a source of manifold ported vacuum. PCV hose goes connected to a port under the carburetor throttle blades and the other side VC is fitted with an open breather."
(1 PCV and 1 Breather on each side of the valve cover).

It all makes sense now. My dipstick seemed to pop up everytime when I drove it and got some oil splatter on the passenger valve cover. The way I had it installed, there was no crankcase combustion gases being sucked out of the engine and reburned. I have also had the rear seal replaced twice now and it's still leaking about a 1-2" puddle after sitting for 24hrs. I have a hunch it may stop this oil leaking issue as well.
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Last edited by Spali32; 07-09-2008 at 07:30 PM.
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Old 06-09-2008, 01:52 AM   #9 (permalink)
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Re: PCV's and Breathers

Quote:
Originally Posted by Spali32 View Post

I have been advised that this is the correct PCV system to use.
CORRECT!
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Old 06-09-2008, 02:02 AM   #10 (permalink)
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Re: PCV's and Breathers

Thanks for your help Kultulz. I hope others who run into the same ?'s/issues can use this information too.
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Old 06-09-2008, 02:11 AM   #11 (permalink)
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Re: PVC's and Breathers

Quote:
Originally Posted by 347LX View Post

Running a "PCV" into the carb base plate or into manifold could not be very performance oriented. Look at the money you spend on air cleaners,carbs, intakes, and such to get the most cold,fresh air to mix with the fuel. Add a "pcv" and now your injecting hot,oil contaminated air into your intake charge.
No, it is not. But the crankcase has to be ventilated. On a competition only engine, this can be done by creating a vacuum from the headers. But this is not practical for the street.

Actually, you are not ingesting oil, but only bypass fumes from the crankcase. If she is sucking oil, it either needs to be serviced or have a ring job.
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Old 05-01-2010, 06:15 AM   #12 (permalink)
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Re: PCV's and Breathers

Quote:
Originally Posted by Spali32 View Post
I have been advised that this is the correct PCV system to use.

"The PCV requires a source of manifold ported vacuum. PCV hose goes connected to a port under the carburetor throttle blades and the other side VC is fitted with an open breather."
(1 PCV and 1 Breather on each side of the valve cover).

It all makes sense now. My dipstick seemed to pop up everytime when I drove it and got some oil splatter on the passenger valve cover. The way I had it installed, there was no crankcase combustion gases being sucked out of the engine and reburned. I have also had the rear seal replaced twice now and it's still leaking about a 1-2" puddle after sitting for 24hrs. I have a hunch it may stop this oil leaking issue as well.
i am running 2 pvc's, but i wounder if this affects the oil pressure! is this a bad idea?
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Old 05-01-2010, 06:21 AM   #13 (permalink)
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Re: PVC's and Breathers

yes bad idea- theres no fresh air drawing thru the engine- - pcv -on one cover - breather on the other cover--
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Old 05-01-2010, 05:14 PM   #14 (permalink)
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Re: PVC's and Breathers

I've tried with and without the PCV at the track, and even with this so called hot, oiled up air, i run 10.7 consistantly either way.
I have just run it like this for years and works nicely, the PCV connected to the base of the 750 Demon i use. I like to keep things simple.

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Old 05-01-2010, 08:12 PM   #15 (permalink)
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Re: PVC's and Breathers

So if one side is blow, and one side is suck, does it matter which side is which?
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