Oil air separators?

Posted By: 3hundred

Oil air separators? - 07/10/14 08:38 PM

Please school me on Oil air separators. Never heard of them before. Would there be some benefit to installing one on my '13 Chrysler V6? Warranty concerns?

Or are they just another way to spend money feeling like you've accomplished something?

TIA,
Robert

Posted By: 5wndwcpe

Re: Oil air separators? - 07/11/14 04:20 AM

Many, many people over at Challengertalk.com run them on the 5.7's. They say the catch cans usually have 1 to 2 oz. of oil in them at every oil change. That's substantial considering where that oil would be going were it not for the cc. Not as many seem to run them on the 3.6L but those who do report trapping oil as well.

Posted By: MoparMarq

Re: Oil air separators? - 07/12/14 12:41 AM

Not familiar with the V6, but I'm putting one on my Toyota with the engine swap. The non-PCV side vent goes into the intake upstream of the throttle body. So the theory goes that an oil catch can may help minimize oily buildup on TB and associated idle air bypass and other vacuum passages and sensors.

Oil also has a lower octane than fuel IIRC, so it should increase ping margin by an infinitessimal amount. (That's my story and I'm sticking to it...)

Posted By: Dodgeguy101

Re: Oil air separators? - 07/12/14 01:44 AM

I had allot of pinging in my 01 5.2 ram. I put a plastic overflow bottle between the PVC and the throttle body. You wouldn't believe the water and a little bit of oil in there after 3000 miles. I know the engine had some blow by, but it was unbelievable the difference in performance.

These engine have so much vacuum, I guess, that they pull any crap they can thru the valve cover into the throttle body.

They work, I just got a 11 ram pickup with the 5.7, so I will pay attention to what it needs. Seems a shame you have to fix a problem the factory knows is there.

Posted By: BDW

Re: Oil air separators? - 07/12/14 02:57 AM

They're big with the Mustang crowd, not sure it did anything, but it looks cool.

It's 1 of those things that make sense in theory, but hard to really quantify with results.

Posted By: ThermoQuad

Re: Oil air separators? - 07/12/14 12:54 PM

Quote:

They're big with the Mustang crowd, not sure it did anything, but it looks cool.
It's 1 of those things that make sense in theory, but hard to really quantify with results.

I just love and hate posts like this...to the OP please ignore this opinion while i share some facts.

Oil in the a/f mixture causes pinging. Engines under load produce oil vapor that gets pulled thru the pcv into the a/f mixture.

The devices the horse crowd are using work and work well as we ran the omg "mustang part" on 2 mopars that ran numerous laps on the road course.
Besides collecting oil while running fast they also collect oil under normal driving. Every car should have one. I would post pics of the device but the pics are on a different computer and won't change a thing on here....

Posted By: BDW

Re: Oil air separators? - 07/12/14 01:38 PM

Quote:

...to the OP please ignore this opinion while i share some facts.

Besides collecting oil while running fast they also collect oil under normal driving.

So your "facts" are that it collected oil? Very good. no one disputes that, now "prove" how much benefit you get from removing 2 tsps of oil from intake system over 5000 miles.

Posted By: 3hundred

Re: Oil air separators? - 07/13/14 03:57 AM

Thanks for the info guys, I appreciate it. One follow up question. Would using this thing reduce carbon build up on the valves?

Robert

Attached picture 8206565-Carbon.JPG

Posted By: radar

Re: Oil air separators? - 07/13/14 05:32 AM

Dunno about the valves. I do know that with a high revving cam and 4.10s on my stick shift Demon it would blow a bunch of smoke out the back while engine braking from a high rpm blast. My theory was that it was sucking oil out of thd PCV under high vacuum. I put a catch can inline and no more spy hunter smokescreen!

My tolerance for burning/consuming oil is pretty high from messing with vintage harleys but it has to be better for the engine to use the oil for lube not fuel.

Posted By: larrymopar360

Re: Oil air separators? - 07/13/14 09:02 PM

I had a catch can on my '06 Charger SRT8 and there was definetly a significant amount of oil in there at every oil change.

I also don't know about on the V6.

Posted By: 360view

Re: Oil air separators? - 07/14/14 01:52 PM

On 1992-1995 Magnum v8s the PCV valve discharges into the passenger side of the "beer barrel" intake manifold that has an internal center divider that nearly closes off the plenum into two sections for 4 cylinders each. I suspect this sends more oil vapor to cylinders 2, 4, 6 and 8 which may cause more carbon deposits on those cylinders.

The Magnum V8 intake manifold also has an IAT sensor mounted in cylinder 1 intake runner and i have wondered if using that threaded hole whether all the PCV vapor could temporarily be injected there as an experiment to see what happens to cylinder 1 alone from getting all the "gunk" to burn.

During the experiment the IAT sensor could be located somewhere else, like many owners have already done to slightly advance or retard ignition timing.

With todays cheap video boroscopes it is easier to look into combustion chambers and the half inch threaded hole on Magnum V8s cylinder No 1 intake runner also allows an easy place to look at the backside of the intake valve, or even watch the injector spray pattern.