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Oil catch can?

C25A1guy

By C25A1guy
in Engines & Drivetrain

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RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
Posted

What my truck looked like today back to being just oil mainly and a very small amount

 

8a3decf6808f35119b83b2cfb3ff12ba.jpg

 

 

Ryan

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ToesonTheNose
ToesonTheNose

Here at RX now they are doing a video install on my truck

Jay700
Jay700

My dealership said my catch can wasn't needed and wouldn't catch anything. I opened it in there shop after 2,000 miles and let it run on the floor. Lol

fondupot
fondupot

So, I added a second output fitting to my Original RX catch can. I had been emailing with the RevExtreme folks about the benefits of a dual output can, and they were gracious enough to send me the par

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mjj Enthusiast

mjj

Posted
Posted

 

As the temperature of air rises, it can hold more water vapor before it becomes 100% saturated.....

Wow it does hold a decent amount more. Make sense. Thanks.

Spurshot Senior Enthusiast

Spurshot

Posted
Posted

Just keep in mind that motor oils are hygroscopic and will hold water in solution. From what I've read, synthetics will hold more water than mineral oils. At what percentage the water becomes visually apparent is beyond me. I know water, air, and oil mixed up well, make a light colored froth.

JC84 Enthusiast

JC84

Posted
Posted (edited)

Still debating on which catch can to get

Edited by JC84
mjj Enthusiast

mjj

Posted
Posted

....I know water, air, and oil mixed up well, make a light colored froth.

As do I. And if you haven't experienced what that frothy mix can do take a look at this pic.

Now this isn't a truck but but was my wife's Acadia which I think still shows a good example. The PCV hose dumps into the middle of the air duct going from the air filter box to throttle body. You can see the frothy mix pooled in the duct and the throttle body directly to the left. The MAF sensor is to the right of the pooled froth. Once I discovered it collected there I'd have to clean it out every week or two in the winter. Probem was, at least what I suspect was happening, was when you punched the gas petal this froth would get sucked into the throttle body as the vehicle would stumble and shutter under most WOT situations. It would also randomly throw check engine lights. The MAF sensor went bad, again my suspicion was that this froth sloshed backwards possibly while going around corners etc and came into contact with the MAF sensor eventually ruining it.

 

This I now refer to as GM's cheap version of a crappy catch can. It may work fine in warm climates but not colder ones like where I live. I would rather play it safe and try to prevent a lot of this from getting to the engine than be sorry with my new truck.

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JC84 Enthusiast

JC84

Posted
Posted (edited)

U guys had me curious so I pulled my air lid/filter apart to look down the Tb. I have 8700 miles and I don't have any oil in the tb or in the intake. Wonder if it's location difference or driving habits or something totally different that is effecting more vehicles than others. And I didn't clean it before taking the pic. I also looked at my wife's 13 GMC Terrain that is di has 25k miles. Intake had very little coating of oil like if u sprayed a little cooking oil on something

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Edited by JC84
Spurshot Senior Enthusiast

Spurshot

Posted
Posted (edited)

As do I. And if you haven't experienced what that frothy mix can do take a look at this pic.

Now this isn't a truck but but was my wife's Acadia which I think still shows a good example. The PCV hose dumps into the middle of the air duct going from the air filter box to throttle body. You can see the frothy mix pooled in the duct and the throttle body directly to the left. The MAF sensor is to the right of the pooled froth. Once I discovered it collected there I'd have to clean it out every week or two in the winter. Probem was, at least what I suspect was happening, was when you punched the gas petal this froth would get sucked into the throttle body as the vehicle would stumble and shutter under most WOT situations. It would also randomly throw check engine lights. The MAF sensor went bad, again my suspicion was that this froth sloshed backwards possibly while going around corners etc and came into contact with the MAF sensor eventually ruining it.

 

This I now refer to as GM's cheap version of a crappy catch can. It may work fine in warm climates but not colder ones like where I live. I would rather play it safe and try to prevent a lot of this from getting to the engine than be sorry with my new truck.

 

 

On our trucks, there are 2 hoses going to the air duct between the MAF and throttle body. They are supposed to let air into the crankcase. The PCV line is connected to the manifold where there is high vacuum.

 

On your wife's car, it sounds like it's the same design, but maybe the PCV is plugged/stuck?

Edited by spurshot
mjj Enthusiast

mjj

Posted
Posted

 

 

On our trucks, there are 2 hoses going to the air duct between the MAF and throttle body. They are supposed to let air into the crankcase. The PCV line is connected to the manifold where there is high vacuum.

 

On your wife's car, it sounds like it's the same design, but maybe the PCV is plugged/stuck?

Nothing was plugged, made sure of that many times, as did the dealer. There was this one on the front side of the engine and on the back there was another. Poor design on GM's part. You can't convince me otherwise after what I've seen and experienced on that model. I just think GM has developed better ways to handle this on the newer vehicles. Live and learn....

SkiDooNick700 Enthusiast

SkiDooNick700

Posted
Posted

Question on the Clean Side Oil Separators... so these are only effective under WOT conditions? I don't see myself going WOT very much. For the occasional time I do, would it just be a really tiny amount of oil must getting sucked in? I'll be running a Catch Can and will also more than likely run some type of intake cleaner around every 15,000 miles regardless.

Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted

U guys had me curious so I pulled my air lid/filter apart to look down the Tb. I have 8700 miles and I don't have any oil in the tb or in the intake. Wonder if it's location difference or driving habits or something totally different that is effecting more vehicles than others. And I didn't clean it before taking the pic. I also looked at my wife's 13 GMC Terrain that is di has 25k miles. Intake had very little coating of oil like if u sprayed a little cooking oil on something

Do you have a 5.3 or 6.2? If 5.3, you won't see oil at the throttle body and intake because the PCV line is connected to the driver's side valley cover about halfway back. My throttle body was spotless on my 5.3 but my catch can is catching all kinds of crap. It's not just affecting certain models it's all DI engines regardless of make or model and Toyota seems to be the only manufacturer to attempt addressing the issue by designing a system that periodically sprays fuel on the back of the valves. While that may help clean the valves, it doesn't do anything to stop this crap from entering the engine to begin with though. Only a catch can will do that. After seeing the results of my can, I'm sold on using one.

 

 

Sent from my iPhone using Tapatalk

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Spurshot Senior Enthusiast

Spurshot

Posted
Posted (edited)

Question on the Clean Side Oil Separators... so these are only effective under WOT conditions? I don't see myself going WOT very much. For the occasional time I do, would it just be a really tiny amount of oil must getting sucked in? I'll be running a Catch Can and will also more than likely run some type of intake cleaner around every 15,000 miles regardless.

The "clean side", under idle and part throttle, normally has air flow from the air cleaner into the crankcase because vacuum in the intake manifold is high where the PCV valve is connected. This ensures crankcase pressure is lower than the air cleaner pressure and air flows into the crankcase thru the "clean side" tubes. It's as simple as the PCV valve is connected downstream of the throttle body and the "clean side" is upstream from the throttle body. The throttle body is a restriction in part throttle operation, which creates a lower pressure on the downstream (intake manifold) side.

 

Under wide open throttle, there is much less vacuum (absolute pressure is higher) inside the intake manifold where the PCV is connected. The throttle body is less of a restriction at WOT and less pressure differential. The flow of crankcase vapor is not being forced in the direction of the PCV valve with as much pressure differential. Pulses in the air flow through the intake System cause the small difference in pressure to change. This may allow some small flow from the crankcase to go thru the "clean side" toward the intake duct.

 

I don't know what is in the RX clean side cap. I assume it's a small coalescing device to separate oil, just in case the flow reverses . In theory, a one way valve would work too. But that has risks if the PCV plugs.

Edited by spurshot
hotrodz37 Senior Enthusiast

hotrodz37

Posted
Posted

After driving with mine mounted to the bake booster, I think I am going to move it over to the spare battery tray. It looks cleaner mounted to the brake booster but it causing vibration in my pedals, might try a rubber bushing between the brake bolt and the bracket but doubt that will help.

Spurshot Senior Enthusiast

Spurshot

Posted
Posted

After driving with mine mounted to the bake booster, I think I am going to move it over to the spare battery tray. It looks cleaner mounted to the brake booster but it causing vibration in my pedals, might try a rubber bushing between the brake bolt and the bracket but doubt that will help.

I'm thinking of mounting mine to the radiator support, so my battery tray is open to use for a spare battery. But if you'll never put in a spare battery, that area is a good place.

fondupot Senior Enthusiast

fondupot

Posted
Posted

I've had mine mounted at the radiator mount near the spare battery tray since day one. Makes for super easy draining.

GuyGene Enthusiast

GuyGene

Posted
Posted

Thanks boys. Y'all have helped me. Ok, DI is here to stay, got it, will have to deal with it. So, catch can and BG cleaning service every 15,000 miles or so, eh? I can handle that. Back to my plan to test a '15 GM now...

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