another PCV question
Thread Starter
Melting Slicks
Joined: Dec 2000
Posts: 2,629
Likes: 7
From: Lawrenceville PA
another PCV question
I need some help trying to figure out this PCV thing. I have a 1972 with the base engine and aftermarket valve covers. Do both valve covers have PCV valves or is it just the driver's side that gets the valve and the passenger side that gets the hose from the air cleaner? I have had conflicting advice where someone I respect said that both sides get PCV valves, but I think he's wrong. Thanks.
C6 the C5 of tomorrow
Joined: Nov 2000
Posts: 6,665
Likes: 2
From: Twin Cities Minnesota
Re: another PCV question (midget)
There is only one PVC, the other side is a hose that connects to the clean side of the air filter.
The PVC, on my '69 is on the drivers side, the air hose is on the pass side...
The PVC, on my '69 is on the drivers side, the air hose is on the pass side...
Melting Slicks
Joined: Jun 2001
Posts: 2,340
Likes: 2
From: Moro IL
Re: another PCV question (midget)
On most it's just the driver's side that has the PCV valve with the passenger cover having the breather. As far as I know nothing OEM has two PCV valves. It really shouldn't matter which cover has the PCV as long as the other has the breather as long as the lines connecting them are hooked up right although some valve covers will have a baffle that sits under the PCV to keep it from drawing too much oil.
:cheers:
Pat Kunz
:cheers:
Pat Kunz
Pro
Joined: Apr 2002
Posts: 677
Likes: 0
From: WInnipeg Mb
Re: another PCV question (midget)
One side (usually the driver side) valve cover gets the pcv valve with the hose going to the carb, the other side (passenger) gets either an oil breather or the breather hose going from the valve cover to the air cleaner... both work the same way
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 98
From: Ontario
Re: another PCV question (midget)
Perhaps this will help. The vent to air cleaner is clearly visible. The PCV is at the front of the driver's side valve cover under that smog pump hose straddling the engine. You can see the PCV hose leading into the base front of the Q-Jet.
Racer
Joined: Feb 2002
Posts: 276
Likes: 1
From: Arlington Texas
Re: another PCV question (Ben Taylor)
Judging from your picture the setup is correct. And Ben's response is correct. I will add that under high intake manifold vacuum the pcv valve is closed so that the fuel/air mixture is not diulted. At lower vacuum conditions the pcv valve opens to allow crankcase vapors to be burned. The system takes clean air from the air cleaner and routes it through the crankcase thru the pcv valve to the base of the carb. and into the intake and thus the combustion chamber. There is and should be only one pcv valve on your setup.
Hope this helps.
:flag
Hope this helps.
:flag
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: another PCV question (paul79)
Paul
Nothing against you but what a mess of wires and tubes and what not! Glad I got an older car without emissions crap on it. I think I would go nuts if I had to deal with that everytime I had to work on the engine. Looks like everything is clean and in good shape but there is just so much going on. :crazy:
Nothing against you but what a mess of wires and tubes and what not! Glad I got an older car without emissions crap on it. I think I would go nuts if I had to deal with that everytime I had to work on the engine. Looks like everything is clean and in good shape but there is just so much going on. :crazy:
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Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 98
From: Ontario
Re: another PCV question (Fevre)
It is a little busy isn't it! Not hard to figure out however. There's the AIR (air injection reactor) pump and injection pipes, the EFE (early fuel evaporation), EGR (exhaust gas recirculation), PCV (positive crankcase ventilation), THERMAC (thermostatic air cleaner) and ECS (evaporation control) systems. Aided and abetted by little vacuum sensors such as the TCS (thermostat control switch) and the like. Not to mention the cat con. Somehow it still all comes together: the car runs well ;) .