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Oil Catch Can and Blow-by

Jeepin' John

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Wait, I keep 5W30 in the jeep in the summer, it even says 5W30 on the cap. 2.0T Etorque.

I *might* put a thinner grade in the winter, unless the warranty people are watching.
no kidding, I had no idea the 2.0 takes 5w-30. That's food for thought. Pentastar here, and trying to get rid of low speed pre ignition
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Jeepin' John

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Any evidence that oil consumption is up on engines using 0w-20? In my experience, it’s never the oil’s fault. Poor PCV design is most oil consumption that is considered “normal”.
i don't care about oil consumption specifically. I'd be fine with using the same amount as long as it doesn't end up in the combustion chamber.

I want to eliminate low speed pre ignition in my pentastar, and -think- it's because too much oil is ending up mixing with fuel in the combustion chamber due to the oil being thinner

every tech article i read about LSPI seems to talk about oil the most and what oil companies are trying to do to reduce LSPI with oil formulations. Why would they be doing that? I think that's a hint that they know high-compression engines running 20-weight oil for fuel economy purposes are having more oil in the combustion chamber, causing knock.

But it's just an idea i wanted to float to the guys who know more about this stuff
 
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mwilk012

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i don't care about oil consumption specifically. I'd be fine with using the same amount as long as it doesn't end up in the combustion chamber.

I want to eliminate low speed pre ignition in my pentastar, and -think- it's because too much oil is ending up mixing with fuel in the combustion chamber due to the oil being thinner

every tech article i read about LSPI seems to talk about oil the most and what oil companies are trying to do to reduce LSPI with oil formulations. Why would they be doing that? I think that's a hint that they know high-compression engines running 20-weight oil for fuel economy purposes are having more oil in the combustion chamber, causing knock.

But it's just an idea i wanted to float to the guys who know more about this stuff
Are you having an oil consumption problem?
 

Vinman

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Just keep in mind that nasty oil you drain from the catch cans is the exact same oil that is circulating in the rest of the engine.
 

Gregj

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Just keep in mind that nasty oil you drain from the catch cans is the exact same oil that is circulating in the rest of the engine.
Not really, the oil in the catch can has all the contaminates that have boiled out of the oil (water, unburned hydrocarbons, blow-by etc.)
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Rodeoflyer

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Not really, the oil in the catch can has all the contaminates that have boiled out of the oil (water, unburned hydrocarbons, blow-by etc.)
Gregj
Yeah personally I'd rather have those contaminants in a catch can than reburned through my intake and exhaust system causing loss of catalytic converter life, carbon buildup, etc.
 

OutlawBeard

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Is there any consensus on which catch can is "best"? I have a 2.0T Non-Etorque
 

Rodeoflyer

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Is there any consensus on which catch can is "best"? I have a 2.0T Non-Etorque
They all perform the same function. I knew I would be emptying mine often so that was something I took into consideration. The mishimoto has a drain line with petcock under the front driver side. Takes seconds to empty it.
 

OutlawBeard

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They all perform the same function. I knew I would be emptying mine often so that was something I took into consideration. The mishimoto has a drain line with petcock under the front driver side. Takes seconds to empty it.
Im leaning towards the Mishimoto but I don't believe there's a drain line with the 2.0 kit, it reads towards the bottom of their site that they don't recommend the use of a drain kit with this catch can.
 

Vinman

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Not really, the oil in the catch can has all the contaminates that have boiled out of the oil (water, unburned hydrocarbons, blow-by etc.)
Gregj
The cans are only catching a small portion of the oil that is circulating under the valve covers, what about the rest of the oil, why would it be any cleaner than what the can catches?
 

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Gregj

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The cans are only catching a small portion of the oil that is circulating under the valve covers, what about the rest of the oil, why would it be any cleaner than what the can catches?
I am neither for or against catch cans but I think you misunderstand their location, they are plumbed into the PVC hose and separate out the oil vapor in the crank vapors that are entering the manifold, ie the “blow-by”. They are not catching any of the oil circulating under the valve cover. The oil circulating under the valve cover goes through the filter.
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Rodeoflyer

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Im leaning towards the Mishimoto but I don't believe there's a drain line with the 2.0 kit, it reads towards the bottom of their site that they don't recommend the use of a drain kit with this catch can.
Interesting.. it's not even in the same location as the 3.6l. There must be something blocking the driver side down to fenderwell.. hmmm.
 

mwilk012

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I am neither for or against catch cans but I think you misunderstand their location, they are plumbed into the PVC hose and separate out the oil vapor in the crank vapors that are entering the manifold, ie the “blow-by”. They are not catching any of the oil circulating under the valve cover. The oil circulating under the valve cover goes through the filter.
Gregj
Same air/oil mist that is in the crankcase is under the valve covers. The pcv hose comes off the valve cover. The oily mist is literally sucked right out from under the valve cover.
 

Rodeoflyer

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Same air/oil mist that is in the crankcase is under the valve covers. The pcv hose comes off the valve cover. The oily mist is literally sucked right out from under the valve cover.
Exactly.. the same oily mist combined with fuel dilution and combustion gases. It's a nasty mix that used to vent to atmosphere, now it's reburned.
 

Gregj

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Same air/oil mist that is in the crankcase is under the valve covers. The pcv hose comes off the valve cover. The oily mist is literally sucked right out from under the valve cover.
Right, I think he was under the impression that the catch can was somehow integrated into the valve cover instead of in the PVC hose.
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