Latest attempt to stop oil through the PCV valve

**94Cobra** · 06-29-2008, 11:24 PM

I have been fighting with this oil splash issue for a long time and am determined to keep my PCV valve. My latest idea is pictured below - custom baffles welded into the VC's. The 90 degree elbow will have a 5/8" hose clamped on it. The other end will fit over the bottom of the PCV valve. Then I will run 3/8 hose from the top of the pcv valve to the intake vacuum source. I plan to cap off the pcv valve in the stock lower intake location. We relocated the breather tube on the passenger VC to a more user-friendly location for the 94/95 cars. I will post up the results once I install them tomorrow. I am using an oil separator so I will know right away. Let me know what you all think of this idea. Does it have a chance at working?

**wick** · 06-30-2008, 12:02 AM

Thats interesting Bob.

**gmkillr** · 06-30-2008, 01:03 AM

This is close to what I did.
I plugged my pcv off on the back of the intake, baffled both valve covers, and ran 3/8" fittings and hose from them to a vented catch can.
Since I did this I have had no issues. It worked great!

**Wolfpack Speed** · 06-30-2008, 08:50 AM

I know this is a heavily debated topic but every car we delete the pcv and run breathers on both baffled valve covers, has zero issues...just my 2 cents. This goes for both mod and pushrod combos. Obviously this isn't going to be for every car and combo but for the majority of people this works just fine!

**94Cobra** · 06-30-2008, 10:17 AM

When I ran 2 breathers and eliminated my PCV, I noticed the crankcase fumes would stink up the interior of my car. It was real noticeable when stopped and idling. My wife refused to ride in my car after that!

**yeahloh95** · 06-30-2008, 10:34 AM

I am gathering parts to do this to my car, i don't mind fumes as long as the oil stays where it is supposed to be.

**Rodeheaver's** · 07-02-2008, 10:15 AM

i would give that a try...

**94Cobra** · 07-09-2008, 11:24 AM

This did not work.

I am still drawing oil up through the pcv valve, which is connected to the anodized blue fitting. I am considering pulling the lower intake and fabricating a baffle to go underneath the entire lower. Not sure if keeping the pcv is really worth it, however.

**gmkillr** · 07-10-2008, 03:32 AM

Originally Posted by 94Cobra

This did not work.

I am still drawing oil up through the pcv valve, which is connected to the anodized blue fitting. I am considering pulling the lower intake and fabricating a baffle to go underneath the entire lower. Not sure if keeping the pcv is really worth it, however.

Can I say I told you so? Sorry to hear about your bad luck with the pcv.
Try what I recommended earlier, it works great for my car!

**somethingclever** · 07-10-2008, 09:01 AM

Did you try catch can for the oil droplets to fall out before the gases get returned to the intake?

I believe steeda makes one.

For a street car there is no doubt I would run a PCV valve.

**Jivepepper** · 07-10-2008, 11:14 AM

Originally Posted by gmkillr

This is close to what I did.
I plugged my pcv off on the back of the intake, baffled both valve covers, and ran 3/8" fittings and hose from them to a vented catch can.
Since I did this I have had no issues. It worked great!

That's what I have

I tee both covers to a vented catch can with pcv valve gutted and everything else plugged.

Have you guys every seen the inside of an intake on a stock motor after 50 k there's always s few Oz's oil in it. If you have the pcv system hooked up in the stock set up there will be some oil mist that gets through

This what I use it's a 1QT vented catch can

A link to it.
http://store.summitracing.com/partde...0&autoview=sku

Originally Posted by somethingclever

Did you try catch can for the oil droplets to fall out before the gases get returned to the intake?

I believe steeda makes one.

For a street car there is no doubt I would run a PCV valve.

The oil separators are just a band aid. As soon as the inside element gets saturated with oil, the oil will pass right through.

**94Cobra** · 07-10-2008, 01:09 PM

Thanks Jivepepper for that detailed post. Your setup is one used by many boosted engine combos, but mine is NA. How much oil do you get in your bottle after how many miles? I am debating whether to do your setup or simply run 2 hoses from each of my valve covers into a clamp on style breather. As shown in my pictures, my valve covers are already baffled. Therefore, the amount of oil coming through the fittings should be very small. I am thinking about running the hoses a bit longer down to the bottom of the engine bay to allow the fumes from the breathers to blow under the car. What I am not sure of is whether or not the length of the hose/fitting size might restrict the rate at which crankcase vapors are evacuated. Gmkillr uses a very similar setup - yes you can say you told me so.

**somethingclever** · 07-10-2008, 01:54 PM

Originally Posted by Jivepepper

The oil separators are just a band aid. As soon as the inside element gets saturated with oil, the oil will pass right through.

You're supposed to remove the element so the gases see a pressure drop across the canister and the oil droplets fall.

They are effective.

I'd like to see an oil analysis of a car driven with a vent tube on the street for 3k miles, and one with a pcv setup.

**wick** · 07-10-2008, 03:50 PM

Originally Posted by somethingclever

I'd like to see an oil analysis of a car driven with a vent tube on the street for 3k miles, and one with a pcv setup.

Me too.

**yeahloh95** · 07-10-2008, 06:57 PM

the problem may lie in the intake you have the holleys baffel in the low needs beat down so not as much oil can get around it .

**Jivepepper** · 07-10-2008, 11:01 PM

Originally Posted by 94Cobra

Thanks Jivepepper for that detailed post. Your setup is one used by many boosted engine combos, but mine is NA. How much oil do you get in your bottle after how many miles? I am debating whether to do your setup or simply run 2 hoses from each of my valve covers into a clamp on style breather. As shown in my pictures, my valve covers are already baffled. Therefore, the amount of oil coming through the fittings should be very small. I am thinking about running the hoses a bit longer down to the bottom of the engine bay to allow the fumes from the breathers to blow under the car. What I am not sure of is whether or not the length of the hose/fitting size might restrict the rate at which crankcase vapors are evacuated. Gmkillr uses a very similar setup - yes you can say you told me so.

You're welcom. I see very little oil mostly condensation. I never see oil in my pipes or intake. Also oil skews your AF ratio

Originally Posted by somethingclever

You're supposed to remove the element so the gases see a pressure drop across the canister and the oil droplets fall.

They are effective.

I'd like to see an oil analysis of a car driven with a vent tube on the street for 3k miles, and one with a pcv setup.

Lol I didn't know they came off.

I know after two years my compression test was almost perfect between all they cylinders. 5 had the exact same compression and the other 3 were either 1 point lower or higher.

**94Cobra** · 07-20-2008, 12:00 PM

Latest update. I tried running 2 breathers from each valve cover. My car didn't like that. It idled like crap and an oil leak developed from a grommet in the valve cover. I'm not sure, but perhaps running 3 foot long hoses to each breather down to the bottom of engine bay caused less breathing.

The good news is that I came up with Idea Number 13 that keeps the pcv valve and has drawn zero oil after 20 miles of driving. Thats right, I have tried 13 different configurations to solve this problem. If this continues to work after I put more miles on the system, then I will create a new post with photos and the details of the system.

**Jivepepper** · 07-20-2008, 04:59 PM

Breathers should not cause idle problems unless you forgot plug something off and was still introducing unmetered air into the engine

**94Cobra** · 07-31-2008, 08:34 AM

I gave up and put 3 K&N breathers on it and eliminated the pcv entirely. The guys who run Big Shot Dyno said the pcv probably hurt my power some last Saturday. At WOT when the pcv cannot evacuate enough fumes, the overflow goes right back into the air inlet tract. This contaminates the intake charge, lowers the compression ratio and can cause detonation. That makes sense to me.

**Wolfpack Speed** · 07-31-2008, 09:36 AM

Originally Posted by 94Cobra

I gave up and put 3 K&N breathers on it and eliminated the pcv entirely. The guys who run Big Shot Dyno said the pcv probably hurt my power some last Saturday. At WOT when the pcv cannot evacuate enough fumes, the overflow goes right back into the air inlet tract. This contaminates the intake charge, lowers the compression ratio and can cause detonation. That makes sense to me.

any good engine builder will tell you the same thing, this is why we delete them all the time