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Mighty Mouse PCV Catch can review/install

37601 Views 79 Replies 15 Participants Last post by  Duken4evr
Update: 5,000 miles, this catch can did not work for my application. The following is informational only

Last week I found oil in the inlet of my turbo and also in the intake piping. The oil was coming from the PCV breather on the valve cover.

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After hearing the term catch can on here and texting those pics to a few friends, I researched a bit and learned a little more about using a catch can to deal with this oil in the intake. I wanted to avoid oil in my intake, turbo and intercooler and don't mind modifying my truck. I've seen pictures online of sludged up intakes and my brother was a Volvo/ euro car mechanic and he said he has pulled the intercooler hose off of a VW and damn near a quart of oil came out.

A catch can is a simple thing I could try that's totally reversible if it does nothing. I can just yank it and put the stock hose back on.

Anyway, during my research I found Mighty Mouse solutions, and turns out, he's made a catch can setup for a 2.8L duramax before. He had plenty of pics of his test vehicle on his website in the install gallery. Also, Mighty Mouse is the only catch can company out there that I found that is selling their kits in the 3/4" hose flavor. Never downsize your pcv.

I emailed the company, and I spoke to the owner. That's a huge selling point to me. He emailed back quickly and was helpful. I placed my order and it was shipped same day. Physically in USPS hands and on its way same day, not a ghost tracking number with intent to ship.

On to the kit itself.

Quality: The can is well made and of high quality materials. The can is either powder coated or anodized and is tough to scratch. The threads are flawless and every connection is o-ringed. There is a sight glass and a drain cock. The fittings I chose are -12an (3/4") and they're quite pretty. You can choose different angle fittings.

Function: the top breather has a simple, yet effective check valve. Under suction, the system is sealed and under pressure, it opens. The can "filters" in three ways. There is a drip ledge, and then there is a stainless steel filter mesh, and then a 100 micron exit, which ends up filtering to 90% efficiency, according to Mighty Mouse. To me, it looks like it will at least help since the oil has to go uphill through a maze to make its way to the intake tube.

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On to install. I went with the bracket that they used on their test vehicle. I went with the larger can because of the sightglass and increased capacity. This made my install only very slightly different that's their test vehicle.

The simplest mounting solution, which is what they offer, is to hang the can off of one of the lid bolts for the air box. This works fine and puts the catch can in a great location physically. I think the large can is a little heavy to be hanging off of that bolt, and I will also be switching to an s&b intake system in the near future. For these reasons I will be fabbing up a bracket after I get the new intake and see what the clearances are like.

After you mount the can, the rest is simple. Remove the stock breather hose. I chose not to cut it, and saved it. Hook up the dirty side and clean side, reconnect stuff and clean up your work.

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Initial thoughts are somewhat useless, since I won't know how well it works for a while. But, I've noticed at hot idle there is a gentle puffing of "smoke" from the breather. You can see this same puff of smoke if you remove the oil cap. I am assuming this is by design to vent off blow by.

I will report back if I find any oil in my catch can, or any oil in my turbo inlet. For now, it'll just hang out there.
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I didn't see it on the website. How much was the kit?
He has not listed it on the website as a kit yet. I emailed him and he told me all of the pieces to buy and quoted me $299 I opted to skip the drain hose extension and ended up at 288.

Pretty much you need 3/4" hose and fittings and his mild or draft can
Did it come with a mounting bracket? If not how do you have it attached?
Did it come with a mounting bracket? If not how do you have it attached?
It did. It attaches to the Airbox lid. I'll be swapping out for the s&b airbox this weekend so I'll have to fab up a new bracket

Vid update
I got my kit last night. The hoses that come with it are too soft and kink very easily in my mock fitting. I stopped by orileys this morning and bought their Gates 300 psi 3/4 push on hydraulic hose. Much better quality and stiffer and you can bend it pretty before it kinks. Only cons I see are pushing on the fittings will be much harder now. Initial thoughts are to skip the kit and order all the same parts minus the supplied hose in the kit.
My hoses did the same, they waned to flatten out. I found a happy spot for them and I used the C clips that support the other hoses to help them hold their shape. They seem to be happy how they are.
Yeah I spent about a hour last night trying to get the hose to stay in form, switching back and forth between your pictures and my looking at what I was doing.

The real fun part is going to be the lower connection at the intake tube.
Yea that's the hard one. Play around with the angles on your an fitting to make a nice sweeping bend in the hose
So after tearing my hands all to hell, I came up with an alternative solution for the lower connection on the intake tube.

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I used the end of the stock tube and cut it off a couple of inches and connected a 3/4 I.D. elbow to make the turn and to make it easier to slip over the valve. Seriously, **** trying to fight the hose over that thing lol.

For reference, the stock hose is part number GM 24585200. It is about a 30-40 dollar hose. So if anyone wants to cut it and have one as a back up that's the number.

I also reused the factory hose clamp that was under the engine cover.

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This keeps the hose from vibrating around. I recommend one small washer in the middle of the clamp to help spacer it out from deforming the hose and two washer between the mounting surface and clamp to move it off what I think is a fuel line??? Anyway it should not be touching anything if done right.
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Update: save your money.

I don’t think the catch can is doing anything at all whatsoever. Pulled my cold side intercooler pipe off today and found oil sludge all inside the pipe. Opened the drain on the catch can and only a few drips of oil.

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Think I read someone had a similar issue with the sludge in that pipe on a Facebook group. Is there any other way to get rid of that sludge? Maybe a different brand of catch can that works different or what?
Would it be possible that that sludge was already there when you installed the catch can? Maybe clean it and check it again in a few weeks.
Would it be possible that that sludge was already there when you installed the catch can? Maybe clean it and check it again in a few weeks.
Well it’s in the S&B pipe too and that’s new, and there wasn’t any oil in the can. but I’ll definitly be checking my new pipes again down the road.
Update: owner of Mighty Mouse has been awesome at communication (once again) and we have options to make the can catch more oil and return less to the intake. Options may have side effects such as letting hose fumes into the air under the hood making oily odors. We can even vent all the vapors and return zero to the intake.
vent it to the frame rail and all call it good
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vent it to the frame rail and all call it good
Have you tried this? Just wondering because there is a “sensor” on the pcv where it attaches to the intake pipe right in front of the turbo. I’ve heard it’s a “heating element” not sure what it does
I have done it on other vehicles but not the mini max.................yet

I have let it drip to the ground and I also welded a nipple to my exhaust and ran it in there before too
Talking to the owner of Mighty Mouse solutions, I think my catch can has too much work to do. Too much oil vapor and tons of suction mean that the can simply can’t keep up and the intake is sucking up oil faster than the can can separate it.

So, I’ve ordered parts to convert my “draft” style Mighty Mouse catch can to a “race” style catch can which vents 100% to the air and returns 0% to the intake. The parts To convert this can are a -10an ORB plug in the can and a 3/4” vacuum cap on the intake fitting. Probably could’ve gotten these parts locally but I work dawn to dusk.

For now, I’ve just pulled the return line from the can to the intake so the intake isn’t sucking up the oil anymore. No issues yet.

Downside to this setup is that the oil vapors that aren’t getting sucked up by the intake are vented under the hood. If I start noticing problems from oil vapor getting nasty, getting on things or being odorous then I’ll update you guys.
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