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Old 02-03-2012, 09:47 AM
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Need input on pcv set-up, sbc

I would like some input on a pcv set up. I have searched the forum on this subject, but wanted some advice on my specific application. This is a 383 sbc. Originally, the truck was huffing smoke out of both valve cover breathers. So I installed a pcv valve on the drivers side and hooked it up to carb. vacuum, as it's suppose to be. On the passengers side I installed a push in style breather. The drivers side seems to be fine, even though I need to look a little more to determine if I'm drawing in any oil into the intake manifold. The breather on the passengers side took care of some of the smoke, but is spewing oil. Not pouring, but enough to be a headache. I know the correct setup it to run a push in breather with hose to bottom side of the air cleaner assembly. Wouldn't that draw oil to the air filter? I have been researching this subject. I'm aware of the catch can solution. I've also been reading about the homeade pcv setup using a compressor filter. Any input? I have included a picture of the set up I have now.
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Old 02-03-2012, 09:51 AM
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Also, I'm running stock height valve covers because of interference on the drivers side from the alternator. See pic. I wondered if the taller valve covers would make it more difficult for the oil to reach.
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Old 02-03-2012, 11:02 AM
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Most of the aftermarket SBC valve covers either have very poor or no oil control baffles for the breather and PCV and or the hole is mislocated and the rockers spray directly on the breather holes. (the hole(s) is in the wrong spot)

Take your valve covers off and look on the inside.

Compare to a OEM factory valve cover.

Aftermarket valve covers are made to look pretty, not to function properly.

Beyond that, excessive oil mist and blowby coming out the valve covers
(even thou there is proper PCV/breather baffleing in the right location) means the piston ring seal is fubared.
( rings are scuffed, rings butted (heat,detonation, too small a ring end gap) ring lands distorted, ring installed upside down, cylinders worn or polished walls. broken ring or ring land. excessive piston to wall clearance) incorrect assembly or incorrect engine break in.

mist can also be a minor internal coolant leak. ( head gasket, intake gasket casting crackor porisity, or other water leak ( exhaust rocker studs etc)

detonation is real hard on ring seal.

A compression test and cylinder leak down test will tell the tale.

hone and re-ring.

Last edited by F-BIRD'88; 02-03-2012 at 11:15 AM.
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Old 02-03-2012, 11:16 AM
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I'll be doing a compression test today. Will post numbers later. I have a feeling this post is going in another direction.
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Old 02-19-2012, 08:21 PM
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I haven't got around to doing the compression check, tending to other issues. And since the motor is strong, I have no desire to rebuild it right now. Let me blow it first.

So I installed the fitting that came with the edelbrock air cleaner, underneath the base. I bought a pcv elbow that was the same diameter and enough hose to connect the 2. Slapped that in the passenger side valve cover. No issues during installation. I was still getting a hair of blowby smoke. I suspect it was coming from the gap between the base and the supplied fitting. I sealed it with silicone. Should take care of any escaping air. I drove it about 20 miles to see if my air filter would fill up with oil. There is a little sign of oil, but not much. To fix this I lined the fitting of the port, on the base of the air cleaner, with some screen. I'm using epoxy to hold in place so it doesn't get sucked in. After it is set and cured, I'll put some still wool in there so the oil has something to cling to. Hopefully this cures it. If not, I have plans for a homeade catch can.
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Old 02-19-2012, 11:08 PM
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You need to fix the valve covers baffling so the oil never gets that far up.
The fox is already getting into the chicken coop.

Thats a bad sign. (excessive blow by, bad piston ring seal)
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Old 02-20-2012, 08:05 AM
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The next time I change the plugs I will get a compression reading. Judging by the blow by and leaks everywhere when I got this truck, I'd say its probably time to be freshened up. It's still strong so I want to drive it. Maybe a good winter project. The valve covers have baffles in them. They are new Edelbrocks. Will the steel wool trick work for the baffles? Any other ideas?
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