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PintoMan1

Author Topic: Factory crank case ventilation...  (Read 2371 times)

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Offline 76hotrodpinto

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Factory crank case ventilation...
« on: February 02, 2015, 12:47:00 PM »
On the 2.3. Does the lower case ventilation run strait in to the air cleaner? Or "T" in to the top vent hose and then the air cleaner?
1976 half hatch 2.3 turbo w/t5.

Offline pinto_one

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Re: Factory crank case ventilation...
« Reply #1 on: February 02, 2015, 12:59:35 PM »
the Crankcase vent , under the intake , a PVC valve goes there to intake vacuum,  the top of the oil filler on the valve cover goes to the air cleaner
76 Pinto sedan V6 , 79 pinto cruiser wagon V6 soon to be diesel or 4.0

Offline 76hotrodpinto

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Re: Factory crank case ventilation...
« Reply #2 on: February 02, 2015, 01:10:38 PM »
Thank you sir. Any idea why almost every one I encounter just has a hose and pod filter on it(the bottom vent)? Seems like it's just an excuse to slap a little more chrome on. I'm a function before form kind of guy.
1976 half hatch 2.3 turbo w/t5.

Offline pinto_one

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Re: Factory crank case ventilation...
« Reply #3 on: February 02, 2015, 02:28:58 PM »
don't worry , you would be surprised of the ones I stumbled over the years that were not hooked up, hooked the wrong way, and plugged with a pipe plug screwed in it, but most were just clogged up at carb to manifold adaptor, very common . the pod on the block is a oil separator for the PCV valve , the filter is in the air cleaner ,
76 Pinto sedan V6 , 79 pinto cruiser wagon V6 soon to be diesel or 4.0

Offline amc49

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Re: Factory crank case ventilation...
« Reply #4 on: February 02, 2015, 09:36:04 PM »
Most people think they have actively 'done something' when they dump that PCV valve, it really accomplishes nothing and on later models like now can even lower engine life. Hose routing as pinto_one says.......... ...messing with it shows the hate people have for emissions equipment and by extension government regulation.

Offline 76hotrodpinto

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Re: Factory crank case ventilation...
« Reply #5 on: February 04, 2015, 12:59:12 PM »
Should there be a pcv valve in both lines? Seems like it could cause a vacuum leak if there isn't.
1976 half hatch 2.3 turbo w/t5.

Offline pinto_one

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Re: Factory crank case ventilation...
« Reply #6 on: February 04, 2015, 01:44:59 PM »
The PVC Valve in only in one place, and only takes one, from the POD under the intake manifold you have a kind of "S" shaped hose , from ther you put the PVC Valve into, see photo, the other end (smaller hose) goes to the spacer between the carb and intake , some also had a brass valve in line that at very high temps it would open and speed up the engine some to help cool it down, no other line should be hooked to it at all, none , 
76 Pinto sedan V6 , 79 pinto cruiser wagon V6 soon to be diesel or 4.0

Offline 76hotrodpinto

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Re: Factory crank case ventilation...
« Reply #7 on: February 04, 2015, 01:54:48 PM »
Cool. Thanks.
1976 half hatch 2.3 turbo w/t5.

Offline amc49

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Re: Factory crank case ventilation...
« Reply #8 on: February 05, 2015, 01:54:23 AM »
One pcv valve only. A valve cover to air cleaner hose takes clean air from air box into motor, through it and then through pcv hose and then to intake. A pcv valve IS a small calibrated intentional vacuum leak that is purposefully sized to fit in with the engine idle air requirements.

Offline 76hotrodpinto

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Re: Factory crank case ventilation...
« Reply #9 on: February 05, 2015, 10:27:54 AM »
I always thought they were a little ball loaded, one way valve.
1976 half hatch 2.3 turbo w/t5.

Offline amc49

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Re: Factory crank case ventilation...
« Reply #10 on: February 05, 2015, 03:09:58 PM »
Vacuum loaded against a spring........ ...high idle vacuum pulls it to the seat. There is a small orifice that is the only leak at that time, the small hole is what plugs up to nix the part. When engine speed goes up vacuum drops and valve begins to fall open to be a much bigger leak then, it combines with positive pressure on the other entry hose and both then blow air out rather than one in and one out at lower speeds. Actually two leaks in valve, a major one and a minor one. At max the other way a true shutoff to prevent a backfire igniting the crankcase.

If it was a one way check only there would be no need for multiple part numbers, one valve would work on all engines. Not so, the smaller orifice is sized for each particular engine since it is a vacuum leak. Why things can muck up if say a V8 pcv is put in a 4 cylinder. V8 generally has a bigger hole. Why as well I always use same pcv over and over if made of steel, they never wear out and with today's industry crossfitting as many parts as they can to cut inventory very likely to now buy one with wrong size hole even if makers' catalog says it works. I haven't bought a pcv in 40 years, I simply dump the old one in acetone to loosen deposits, blow it out and stick it right back in motor, it works fine. Why buy again what's not broke?

Offline 76hotrodpinto

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Re: Factory crank case ventilation...
« Reply #11 on: February 05, 2015, 03:26:45 PM »
I don't have one at all, so I need to get something.
1976 half hatch 2.3 turbo w/t5.