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06HemiLtd 03-02-2013 03:18 PM

Catch Can Results 5.7L Hemi
I installed a BT Catch Can in mid January(jeep had 68k miles). About 2 weeks later i was showing my brother-in-law and decided to unscrew the base to show him how it works. I told him there might be a drop or two or maybe some spray. To my surprise, the damn thing was half full. I checked it again in mid february and again it was half full. I checked it today and it was so full I don't think anymore could have fit in it. I checked my oil and it was right at full mark. Has anybody else had similar results.

jeepgcoman 03-02-2013 04:01 PM

Re: Catch Can Results 5.7L Hemi
Yep, that's pretty common, especially when it's cold and damp out. Since you're in Ohio, I think I'd check it every couple hundred miles in the winter. Most of it is condensation mixed with a little oil (mayonaise). In the summer, when it dries out a little, it should turn back to just oil....and not very much of it. If there continues to be a lot, you may want to check/change your PCV Valve.

I've done two 800+ mile trips and had the same results....overflowing can. Currently I am doing an experiment, added another PCV Valve before the catch can. Yesterday I did a short (~160 miles) trip and it picked up about the same as it did with one valve. Maybe this won't retard the flow like I was hoping it would.

06HemiLtd 03-02-2013 04:54 PM

Re: Catch Can Results 5.7L Hemi
thanks for the reply. i've seen pictures of what others have collected and it seemed like just a few drops in the can. Mine is a full cup every few weeks. thought maybe something was wrong. thanks again.

DannyVtCa 03-02-2013 08:24 PM

Re: Catch Can Results 5.7L Hemi
When I did my cross country trip to california from vermont in October it was raining and miserable until I hit Iowa. I checked my catch can after the first night... Roughly 1000 miles and Chicago area and it was completely full of mayonnaise.... So much so that some mayonnaise was starting to get sucked back into the intake because I think my catch can was clogged full causing the pcv system to not work properly. I 2nd jeepcogman... 800 miles in wet/ winter is about the max for our catch cans. Now here in the dry environment I never get mayo, just a little bit of oil. I'm doing autorx treatment right now and actually saw tiny bits of black sludge in the catch can the other day... 500 miles into the treatment. Can't wait to cut the filter open after 3000 miles and see what has come loose.

torque-head 03-02-2013 09:47 PM

Hey guys, I've never heard of this catch can deal before. What does it do and where is it installed? Sorry to hi-jack the post but I just had to ask.


DannyVtCa 03-03-2013 12:13 AM

Re: Catch Can Results 5.7L Hemi
Take off your engine cover. Look at the intake manifold. There is a rubber hose near the passenger side rear that connects the pcv valve to the intake manifold. You can install the catch can in various different places and it is supplied with rubber hoses. One hose connects to your pcv valve outlet and the other to the intake manifold. The purpose is to catch the oil blow by from the pcv valve that circulates into the intake manifold and is ultimately sucked into the combustion chamber. Oil doesn't burn very well, causing carbon build up on the pistons, nasty oil residue on your intake runners, dirty intake manifold, and oily buildup on the butterfly of the throttlebody. If you don't have a catch can, it should be the first aftermarket accessory you buy.

jeepgcoman 03-03-2013 07:42 PM

Re: Catch Can Results 5.7L Hemi
Here is a quote from another forum that Mike from Diablosport made regarding the PCV System on the Hemi's.....a real eye opener. Like Dan said, if you have a Hemi, this should be the first aftermarket accessory you buy.

"No, this is where I comment on lost power due to oil contamination in the intake tract/combustion chamber. I will assure you that after having seen as many logs of as many HEMIs as we have here at DiabloSport, not to mention the numerous Hemi vehicles we have had on our dyno for R&D, I can say, without a doubt, that the HEMI's PCV/Oil Vapor control is the worst of anything we deal with. All you have to do is pull your intake manifold to see the puddles of oil collected in there, and realize that it eventually gets in the combustion chamber, and oil don't like to burn, thus, detonation occurs.

There is no gimmick here. HEMI's have KR issues. The KR issues are 99% of the time contributed to by oil contamination in the intake charge, reducing the effective octane in the combustion chamber, and leading to a loss of performance.

Plenty of people have seen solid power gains on even stock vehicles when getting rid of an oil issue by adding a catch can that works properly."

SteelBlueWK 03-04-2013 08:46 AM

Re: Catch Can Results 5.7L Hemi
I just installed my BT Catch Can yesterday on my 2007 WK 5.7L. Installation was super easy with a homemade bracket attached to the rear most bolt on the passenger side strut tower. I will check it in about 500 miles to see what I 'caught'. Should be interesting due to cold, wet weather we've been having this winter.

torque-head 03-06-2013 07:57 AM

Re: Catch Can Results 5.7L Hemi
I've looked around and seen some for sale, but is one better then the others? which one do you guys recommend getting and from where?

SteelBlueWK 03-06-2013 08:51 AM

Re: Catch Can Results 5.7L Hemi
IMO, the Billet Technology catch can is the best available. You can buy other brands or even make your own- there are lots of YouTube videos on this. But the design and craftsmanship of the BT catch can is exeptional. Here's a link to their website with lots of pics:

The Original Catch Can | Billet Technology

Walt 03-06-2013 05:26 PM

Re: Catch Can Results 5.7L Hemi

Originally Posted by 06HemiLtd (Post 771346)
thanks for the reply. i've seen pictures of what others have collected and it seemed like just a few drops in the can. Mine is a full cup every few weeks. thought maybe something was wrong. thanks again.

I have the BT Oil Catch Can installed (jeepgcoman's recommendation) and live close to you (mid-Michigan). My PCV valve was changed about 25K miles ago.

My experience parallels what other said:
- Very little in Summer, so I empty every month or oil change whichever comes first.
- Lots more in Winter that is mainly emulsified oil/water (mayo or latte). I empty every 2 weeks with it about 1/3 full.

Stop/start short trips increase this condensation as the engine heats up / cools down. Think of it this way: better to empty the catch can than to have that stuff go into your intake manifold and then try to burn in the engine.

The BT Oil Catch Can does not improve your HEMI performance. It prevents it from degrading due to oily crud buildup in the intake manifold, on the back side of the throttle body, and around your intake valves.

I empty the catch can accumulation into the "dirty oil" 5-gal jug I use for recycle engine oil.

Roddy 03-10-2013 09:46 PM

Re: Catch Can Results 5.7L Hemi
I have a 2005 WK 5.7 Hemi and have a catch can installed. Using Lucas 0W - 20 full synthetic oil. The Jeep has about 60,000m on the odometer and my last oil change several weeks ago at 5,000 mile interval.
Last oil change I installed a new PCV valve.
The can had 1/3 of a coffee cup of very black oil, which, after 5,000 miles would indicate that 'all is seemingly O.K.' with the engine. I checked the rear of the throttle body and it was clean.......
All said, I am indeed an advocate of catch cans on the 5.7 liter Hemi.
Incidentally, I am now running 0W - 30 full synthetic as the recommended 5W - 20 is rather difficult to easily source in Australia.
I also live in a very hot/dry climate and do not encounter water/condensate within the catch can waste ?

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