PCV in left valve cover, do I need breather in the right? - Chevelle Tech
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post #1 of 15 (permalink) Old May 31st, 16, 8:28 AM Thread Starter
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Dan
 
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PCV in left valve cover, do I need breather in the right?

I'm running a PCV valve routed to the back of the carb from the left valve cover on my BBC. Do I need a breather of some sort on the right side, or can I go with nothing at all?

I'm using a factory drop base air cleaner, but I had to remove the elbow to clear the linkage on my carb ( mech. secondaries ). The elbow from the air cleaner would usually mate up with another elbow and hose connected to the valve cover.

I was thinking of maybe running another PCV on the pass. side and hooking into the existing rubber line from the other PCV that runs past the valve cover to the rear of the carb.

Or can I just plug that outlet on the passenger valve cover and drive on?

Technically, I'm supposed to have a closed system up here, and the breather caps can get you into trouble with the MTO up here.

Dan
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post #2 of 15 (permalink) Old May 31st, 16, 9:54 AM
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Re: PCV in left valve cover, do I need breather in the right?

You need a breather. The air has to flow "through" the engine.
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post #3 of 15 (permalink) Old May 31st, 16, 1:43 PM Thread Starter
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Re: PCV in left valve cover, do I need breather in the right?

So 2 pcv valves is not a good idea?

Dan
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post #4 of 15 (permalink) Old May 31st, 16, 1:56 PM
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Re: PCV in left valve cover, do I need breather in the right?

Nope

Bill Koustenis
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post #5 of 15 (permalink) Old May 31st, 16, 3:20 PM Thread Starter
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Re: PCV in left valve cover, do I need breather in the right?

Roger that.

Dan
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post #6 of 15 (permalink) Old May 31st, 16, 3:38 PM
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Re: PCV in left valve cover, do I need breather in the right?

If you look around a bit you will find a filter that will fit into the grommet on the rh side cover. That will keep out the rocks and june bugs and so on.
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post #7 of 15 (permalink) Old May 31st, 16, 11:40 PM
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Re: PCV in left valve cover, do I need breather in the right?

Quote:
Originally Posted by Dan Orgill View Post
I'm running a PCV valve routed to the back of the carb from the left valve cover on my BBC. Do I need a breather of some sort on the right side, or can I go with nothing at all?

I'm using a factory drop base air cleaner, but I had to remove the elbow to clear the linkage on my carb ( mech. secondaries ). The elbow from the air cleaner would usually mate up with another elbow and hose connected to the valve cover.

I was thinking of maybe running another PCV on the pass. side and hooking into the existing rubber line from the other PCV that runs past the valve cover to the rear of the carb.

Or can I just plug that outlet on the passenger valve cover and drive on?

Technically, I'm supposed to have a closed system up here, and the breather caps can get you into trouble with the MTO up here.
My 66 Chevelle came from the factory with a PCV valve in the left hand valve cover and a push in Breather in the right hand valve cover. It was removable and I cleaned it by soaking it in solvent. It has a mesh of some sort of fiber packed into it. I tried to find an original replacement(Chrome), but the only thing the dealers ever had or anyone else for that matter were "Blue", with AC on them. I don't know what year it changed probably 67, but they went to a grommet in the valve cover, a pipe and then a connection to the Air Filter so actual filtered air went through the motor. I hope this helps.

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post #8 of 15 (permalink) Old Jun 1st, 16, 12:31 AM
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Re: PCV in left valve cover, do I need breather in the right?

Is my PCV/breather setup correct? It's been this way since I bought the car. I've always just assumed the passenger side is a breather that gets air from the air cleaner, however I also would assume there is a vacuum when the carb is pulling air.

On the drivers side it's a PCV that T's to the booster and the back of the carb. Now I am moving to a FiTech EFI that has two 3/8" ports on the TB, so I will be going to 2 hoses, 1 for the booster, 1 for the PCV.




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post #9 of 15 (permalink) Old Jun 1st, 16, 8:22 AM Thread Starter
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Re: PCV in left valve cover, do I need breather in the right?

Quote:
Originally Posted by langss View Post
My 66 Chevelle came from the factory with a PCV valve in the left hand valve cover and a push in Breather in the right hand valve cover. It was removable and I cleaned it by soaking it in solvent. It has a mesh of some sort of fiber packed into it. I tried to find an original replacement(Chrome), but the only thing the dealers ever had or anyone else for that matter were "Blue", with AC on them. I don't know what year it changed probably 67, but they went to a grommet in the valve cover, a pipe and then a connection to the Air Filter so actual filtered air went through the motor. I hope this helps.
Lang,

I was able to run the factory style setup when I had a vacuum secondary carb. After I switched to the mech. secondary Holley, the elbow on the air cleaner base had to come off, hence the issue now.

I can very easily get a push in breather cap, but technically I need a closed system.

Dan
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post #10 of 15 (permalink) Old Jun 1st, 16, 6:09 PM
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Re: PCV in left valve cover, do I need breather in the right?

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Originally Posted by Dan Orgill View Post
Lang,

I was able to run the factory style setup when I had a vacuum secondary carb. After I switched to the mech. secondary Holley, the elbow on the air cleaner base had to come off, hence the issue now.

I can very easily get a push in breather cap, but technically I need a closed system.
Ok, I see the problem. I'm still using the factory original carburetor. Well can you switch the carburetor just for the inspection, or does this have to be a year round thing. Nothing easy anymore.....

Ideas are like children: there are none so wonderful as your own.
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post #11 of 15 (permalink) Old Jun 1st, 16, 7:19 PM Thread Starter
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Re: PCV in left valve cover, do I need breather in the right?

Quote:
Originally Posted by langss View Post
Ok, I see the problem. I'm still using the factory original carburetor. Well can you switch the carburetor just for the inspection, or does this have to be a year round thing. Nothing easy anymore.....
The car isn't required to do any sort of annual inspection, and I could probably get away with the breather cap. BUT, if I get stopped by a knowledgeable policeman, I could have some paperwork coming my way.

Dan
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post #12 of 15 (permalink) Old Jun 1st, 16, 7:50 PM
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Re: PCV in left valve cover, do I need breather in the right?

Quote:
Originally Posted by Dan Orgill View Post
The car isn't required to do any sort of annual inspection, and I could probably get away with the breather cap. BUT, if I get stopped by a knowledgeable policeman, I could have some paperwork coming my way.
Oh I totally understand

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post #13 of 15 (permalink) Old Jun 1st, 16, 8:03 PM
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Re: PCV in left valve cover, do I need breather in the right?

Are you in Ontario Dan??

I heard they are getting tough there.

What year is your car?

Thanks
Randy
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post #14 of 15 (permalink) Old Jun 2nd, 16, 8:20 AM Thread Starter
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Re: PCV in left valve cover, do I need breather in the right?

Quote:
Originally Posted by GLHS60 View Post
Are you in Ontario Dan??

I heard they are getting tough there.

What year is your car?

Thanks
Randy
I am in Ontario, yes.

1969 SS.

I keep hearing more & more stories of guys getting stopped and having to pop the hood. I've never been stopped, and I don't drive like an idiot, which helps. But, you never know.

Dan
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post #15 of 15 (permalink) Old Jun 2nd, 16, 7:27 PM
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Re: PCV in left valve cover, do I need breather in the right?

Appreciate the up date Dan.

Might have to photo shop a 1966 style Engine in a 1969 brochure!!

Thanks
Randy
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