PCV Question- LOTS of Oil

Swarzkopf · Sep 11, 2005

Just a simple question...

How much oil normally moves from your PCV to you intake manifold?

I had to remove my upper manifold yesterday, and the PCV lines were absolutely FILLED with oil. The rear four intake ports also had tons of oil on them.

Is this normal? I didn't think I had any blow-by before as I've ever run a few times with no caps on the filler holes in the valve covers without any issues.

Is the PCV simply doing it's job? It would seem to me that this much oil in the intake manifold can't be good for performance.

urban96 · Sep 11, 2005

from what ive gatherd here its pretty normal for our cars to woof the oil threw the PCV when you start modding them. a fix for it is an air/oil seperator. RIO5.0 just did a nice writeup on the one he installed.

ill be installing one on mine as soon as the engine is ready to go back together

nmcgrawj · Sep 11, 2005

urban96 said:
from what ive gatherd here its pretty normal for our cars to woof the oil threw the PCV when you start modding them. a fix for it is an air/oil seperator. RIO5.0 just did a nice writeup on the one he installed.

ill be installing one on mine as soon as the engine is ready to go back together

Same fix here

Swarzkopf · Sep 11, 2005

Thanks for the quick feedback guys. Makes me feel much better.

HISSIN50 · Sep 11, 2005

A restrictor can also help if one is spewing tons of oil.

All the baffles and mesh screen under the PCV are present?

GOod luck.

Swarzkopf · Sep 11, 2005

Yup, screen is in place in the lower intake. As far as baffles go, I assume you mean the ones on the bottom of the lower intake? If so, they are there.

I'd run an open breather type element, but I'm afraid oil is going to mist out of it. I'm considering going the route that nate and Urban suggested.

nmcgrawj · Sep 11, 2005

Swarzkopf said:
Yup, screen is in place in the lower intake. As far as baffles go, I assume you mean the ones on the bottom of the lower intake? If so, they are there.

I'd run an open breather type element, but I'm afraid oil is going to mist out of it. I'm considering going the route that nate and Urban suggested.

I havent gone too deep into this but its a system and if you run a breather...then that changes what type of system it is. I believe the PCV is a one way valve correct? Then the breather would be two way and cause problems.

Just go to walmart and get the $13 oil/air seperator and then go to murrays to get the hose attachments along with some extra hose to fit the seperator in line of the PCV.

Swarzkopf · Sep 11, 2005

I havent gone too deep into this but its a system and if you run a breather...then that changes what type of system it is.

Eh, I don't think of it as much of a "system". I figure that it's a vacuum activated valve, also allowing extra crankcase pressure to vent.

If I ran a breather, I would've capped off the upper manifold vacuum lines, and attached the breather to the line running off the PCV valve.

Like I said, I don't plan on doing this.

I believe the PCV is a one way valve correct? Then the breather would be two way and cause problems.

Since the valve would still be there, I don't see how it could cause any problems.

HISSIN50 · Sep 11, 2005

How about a closed breather with a line going into a catchcan or something to that effect?

And FWIW, PCV is bi-directional. That is why the line exists from the inlet tube to the oil filler neck - it allows air back into the crankcase (just as a breather does). Viola - bi-directional venting.

nmcgrawj · Sep 11, 2005

HISSIN50 said:
How about a closed breather with a line going into a catchcan or something to that effect?

And FWIW, PCV is bi-directional. That is why the line exists from the inlet tube to the oil filler neck - it allows air back into the crankcase (just as a breather does). Viola - bi-directional venting.

But doesnt the actual PCV valve have a little ball inside that closes if air goes back the other way?

HISSIN50 · Sep 11, 2005

nmcgrawj said:
But doesnt the actual PCV valve have a little ball inside that closes if air goes back the other way?

Absolutely Nate. That is why there is the tube from the inlet pipe to the oil filler - it is a backdoor for air to enter the crankcase.
This tube also expels some crankcase gasses at WOT to help out.

PCV Question- LOTS of Oil

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