Oil Catch Can Install

[Willys41]

Replace your PCV. That's not normal at all.

It has the new updated PCV valve and made NO difference in the amount of oil it collected.
Along with the oil catch can I will avoid detonation and carbon build up.
And I am not the only one.

https://www.wranglerforum.com/threads/3-6-wrangler-jl-detonation-solved.2446287/

https://www.allpar.com/threads/something-that-may-be-of-interest-pentastar-v6-teardown.
241943/

TSB 09-012-22

https://www.jlwranglerforums.com/fo...r-3-6-for-spark-knock-and-misfire-cel.108824/

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[Willys41]

Updated PCV valve.
The one on the bottom is that the new undated compared to the original version.
The other picture is one that fits the JL 3.6 and it is a twist in.

 

[Dusty Dude]

A catch can really isn't needed for naturally asperated applications. I'd suggest not bothering with it.

In “the old days” that was true. However, these days with thinner oils and much thinner, low tension piston rings being used to extract every inch of mileage out of these engines, it has come to the point where they are needed.

If you think about it, a catch can is another air intake filter to keep your combustion chamber clean.

 

[Willys41]

In “the old days” that was true. However, these days with thinner oils and much thinner, low tension piston rings being used to extract every inch of mileage out of these engines, it has come to the point where they are needed.

If you think about it, a catch can is another air intake filter to keep your combustion chamber clean.

I just switch from 5w30 to European Vehicle Full Synthetic motor oil 5w40 witch is what they run in most European engine.

 

[Dusty Dude]

I will probably be switching to that oil too. The last time I took my used oil in for recycling, the guy who dumped it in the tank said that was noticeably the thinnest oil he had seen. 0w-20 oil from my wife’s Subaru.

 

[JeepinJason33]

Getting a bit more sold on these than I was before... What happens if the catch can gets full and you forget to dump it? If it is just half full or so, what happens in off camber situations to the oil, is there a backflow preventer?

 

[alphawolff]

Getting a bit more sold on these than I was before... What happens if the catch can gets full and you forget to dump it? If it is just half full or so, what happens in off camber situations to the oil, is there a backflow preventer?

That's the horror stories. People would go rock crawling and dump a buttload right into the intake

 

[Willys41]

Getting a bit more sold on these than I was before... What happens if the catch can gets full and you forget to dump it? If it is just half full or so, what happens in off camber situations to the oil, is there a backflow preventer?

On mine I added a 1/2in. 4ft drain hose with a ball valve at the end of the hose which doubles it capacity.
Although not necessary every 1000 miles I simply open the ball valve and let it drain. After 1000 miles theirs about 2 or 3 oz. Not even close to filling the hose.
There is never oil in the can it is always in the drain hose.

 

[Willys41]

That's the horror stories. People would go rock crawling and dump a buttload right into the intake

You have to be smarter That.
Like I said provide more oil holding capacity.

 

[JeepinJason33]

On mine I added a 1/2in. 4ft drain hose with a ball valve at the end of the hose which doubles it capacity.
Although not necessary every 1000 miles I simply open the ball valve and let it drain. After 1000 miles theirs about 2 or 3 oz. Not even close to filling the hose.
There is never oil in the can it is always in the drain hose.

Thanks, I was just looking at the Mishimoto catch can and it looks like it has a built in drain valve that drops behind the rear fender. However, it has longer hoses than the UPR catch can. Just have to decide between the two...

 

[Chuckster3]

So Willys41 do you have a PN for the new pcv ?

 

[roaniecowpony]

If you really have a oil related pre-ignition problem, there is too much blow-by and you have a serious engine health issue. That said, if you need to get more oil vapor out of your PCV output, installing an air-oil separator like the Mann-Hummel ProVent type is going to remove more oil vapor. The difference between a "hot rod" or "racing" catch-can and a production intended air-oil separator is that the latter is that it incorporates a self draining feature, often is much higher volume to expand and condense the vapor, and often has a filter membrane to catch more oil vapor.

The opposing view from members here, of a catch-can on our jeeps, is based on that blown engine thread reference where it's believed the catch-can had accumulated a significant amount of oil from very steep maneuvers, then the contents of the catch-can was ingested in a high rate, and caused a hydraulic lock in the cylinders.

I'm getting ready to install a Teraflex Crankcase Breather check valve system to prevent that type of event. I can see where a catch-can or M-H ProVent type separator could be incorporated in this setup.

 

[Chuckster3]

That sounds very similar to the Mishimoto can?

 

[roaniecowpony]

That sounds very similar to the Mishimoto can?

No. The Mishimoto is a catch-can where it has no self-draining. An air-oil separator intended for continuous use (production installation) has a drain that is routed back to the sump.

 

[Willys41]

Thanks, I was just looking at the Mishitting catch can and it looks like it has a built in drain valve that drops behind the rear fender. However, it has longer hoses than the UPR catch can. Just have to decide between the two...

I have herd that the Mishimoto works well. I was amazed how well the UPR works for me.I could not use the Mishimoto because I had other stuff mounted in that location.

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