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PCV sucking engine oil
#1434188 Mon Dec 20 2021 02:33 PM
Joined: Feb 2018
Posts: 371
J
'Bolter
My 47 has been burning quite a bit of oil, even to the point of spewing oil on start up. I was thinking it was engine wear, but now I think it's the PCV valve sucking oil. I like the old school look and want to keep it if possible.
When I put the valve covers on I put a hole in one and welded a baffle in that was removed from a stock '70s cover. Then added a grommet and put the PCV valve in the stock location. The hose goes directly into the manifold.
The motor is a basically stock 350 4bbl.

I'm thinking several thing but could use some advice/ideas. The baffle might need to have better weld coverage to keep oil from coming in from the side/top of the baffle.

Are there different PCV valves that I could try? Should I add a breather to the other side? Is running the hose directly into the manifold to much suction?

It's pretty cold here in central Michigan so I likely won't be addressing the issue for a couple months, but want to have a plan.

Attached Files
141426x.jpg (121.49 KB, 206 downloads)
093430x.jpg (121.12 KB, 205 downloads)
Re: PCV sucking engine oil
Just Mark #1434233 Mon Dec 20 2021 10:19 PM
Joined: Oct 2005
Posts: 3,514
"Hey! I sound like Darth Vader!!
So, where does your engine ventilation come in from? Doesn't look like anywhere. So the vacuum of the intake is going to draw that from the engine/oil area through the PCV.

Early SBC breathing was in the ventilated oil filler cap and out the road draft tube.

Where do you put oil in at? Maybe you need to put in an oil filler (ventilated) cap on the opposite valve cover while still maintaining your old school look?

Re: PCV sucking engine oil
Just Mark #1434240 Mon Dec 20 2021 11:10 PM
Joined: Mar 2007
Posts: 1,608
T
Crusty Old Sarge
Mark you need a fresh air breather at some point, preferably at a level above your PCV. My 327 has an oil filler tube at the front of the manifold, I added a breather cap there.

Check out Lugnutz post in the Engine Shop on this subject, many folks added ideas on how to route the PCV system to add filtered air for the crankcase.

Attached Files
Engine Assembled 2.jpg (236.41 KB, 185 downloads)
Filler Tube w/breather cap
Last edited by TUTS 59; Tue Dec 21 2021 01:12 AM.

Craig

Come, Bleed or Blister something has got to give!!!
59' Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)
Re: PCV sucking engine oil
Just Mark #1434244 Tue Dec 21 2021 12:37 AM
Joined: Feb 2004
Posts: 24,250
H
Kettle Custodian (pot stirrer)
Either put a grommet into the other valve cover and run a fresh air tube to the "clean" side of that Cadillac air cleaner, or put a ventilated cap on the oil filler (wherever that happens to be). Crankcase ventilation has to have an air inlet somewhere to avoid creating a big vacuum in the crankcase and sucking up oil.
Jerry


"Freedom's just another word for nothing left to lose"
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Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

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Re: PCV sucking engine oil
Just Mark #1434245 Tue Dec 21 2021 12:37 AM
Joined: Mar 2010
Posts: 10,074
5
'Bolter
Best way to do it in my opinion is have the PVC valve on the top of one valve cover, and a breather cap on the opposite valve cover. This setup will ensure that you will be removing the nasty watery steam contaminates which likes to collect on the undersides of the valve covers.
Instead of the vented oil cap, you could plumb a hose from the top of the valve cover to a fitting on the air cleaner, providing for a cleaner source of fresh air than what a vented oil cap delivers.

Re: PCV sucking engine oil
Just Mark #1434278 Tue Dec 21 2021 12:18 PM
Joined: Mar 2007
Posts: 1,608
T
Crusty Old Sarge
The vented oil filler tube cap I used has filter material much the same as an oil bath air cleaner would use. The valve covers I used have holes and baffles for the PCV, I only used one side for the valve to fitted in as my manifold had the filler tube and I wanted to stay with the look of the early V8. I routed the plug wires over the PCV on that side, you really need to look to see the valve and hose.

So where do you add your oil from?

Last edited by TUTS 59; Tue Dec 21 2021 12:20 PM.

Craig

Come, Bleed or Blister something has got to give!!!
59' Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)
Re: PCV sucking engine oil
Just Mark #1434282 Tue Dec 21 2021 02:03 PM
Joined: Feb 2018
Posts: 371
J
'Bolter
I've added oil through the hole where the PCV valve is. I like the idea of the breather tube in front of the motor. I had an old 327 that had that. This 350 manifold isn't set up for it though.

So my current plan is to add this breather to the other valve cover. Seems like the easiest. Not sure why I didn't realize I'd need some fresh air inlet to balance things out. Thanks for the input fellas. I appreciate the advice.

Attached Files
085145x.jpg (29.91 KB, 127 downloads)
085152x.jpg (45.38 KB, 126 downloads)
Re: PCV sucking engine oil
Just Mark #1434303 Tue Dec 21 2021 05:55 PM
Joined: Mar 2007
Posts: 1,608
T
Crusty Old Sarge
You could add another baffle at the rear of the opposite valve cover and route a clean air hose/tube to the base of your air cleaner as HRL and 52carl suggested. The hose would be easy to hide at the rear of the engine and allow you to keep the old style valve cover look.

If you look at the picture of my 327 you can hardly see the PCV grommet and hose on the drivers side. Once it's in the chassis it will be even harder to see.

Attached Files
Engine inb Frame 2.jpg (187.23 KB, 128 downloads)
327 PCV
20201213_172427.jpg (344.79 KB, 125 downloads)
327 PCV 2
Last edited by TUTS 59; Tue Dec 21 2021 06:16 PM.

Craig

Come, Bleed or Blister something has got to give!!!
59' Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)
Re: PCV sucking engine oil
Just Mark #1434316 Tue Dec 21 2021 07:43 PM
Joined: Feb 2018
Posts: 371
J
'Bolter
I'm liking that idea more and more.

Re: PCV sucking engine oil
Just Mark #1434317 Tue Dec 21 2021 07:45 PM
Joined: Oct 2005
Posts: 3,514
"Hey! I sound like Darth Vader!!
I'm doing dumb things for engine breathing. But who doesn't like cleaning up oil mist daily?

Attached Files
modela325.jpg (80.06 KB, 113 downloads)
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