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Catch Cans - What's the Verdict? #5434219 05/20/20 02:19 PM
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shimps1 Offline OP
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Looking around the GM boards, it seems the L86 in my Yukon has some coking problems. I've seen some photos after under 10k miles that are concerning.

Looking into installing a catch can. The GM forums are all over the place on the opinions of them.... "Trust the engineers," "Have to have one," "GM will void your warranty," all sorts of stuff.

I'm curious what the thoughts are here on them? $200 piece of mind, snake oil, or truly an intake valve saver?

Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434225 05/20/20 02:28 PM
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Mr Nice Offline
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I'd install one if I have a vehicle known for sucking lots of oil into intake.

Lots of videos on YouTube of people draining their can after 5K miles.

Obviously remove can if you need warranty work....

Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434230 05/20/20 02:34 PM
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BMWTurboDzl Offline
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The appearance of build up does not by default equate to poor performance. Some engines are more sensitive vs others. For example the inspection interval for the BMW N55 (~8 yr old engine design) is 100k miles.

If the user forgets to drain the can and because the can is located outside the engine in really cold climates there's a real issue of water condensate turning into ice thereby causing a blockage.


Basically it's a solution in search of a problem. It's a great product for those who are obsessive or need an excuse to tinker for the sake of tinkering


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434251 05/20/20 03:00 PM
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WylieCoyote Offline
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The reason the auto makers don't install one is entirely because of cost, and maintenance. Every penny they can squeeze out of the build budget is a penny they can spend on executive salaries. And no auto-maker is going to be the first to add a new maintenance item to a vehicle.

Catch cans are far from snake oil, as two of my vehicles have already proven. The Ford Performance catch can I put on my '18 Mustang proved its worth at every OCI when I dumped several ounces of foul-smelling fluid out of it. The JLT catch can I just installed on my Focus ST 3 weeks ago already has 1/4 ounce sitting in the bottom of it, as I checked it for the first time this morning. Below is what you can expect if you don't have something taking the oil mist out of the PCV stream before it hits your intake.

A valve in my Focus ST, at 24,000 miles:

Valve2.JPG

2015 Canyon 3.6
2018 Mustang Ecoboost Convertible
2017 Focus ST
Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434261 05/20/20 03:11 PM
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CT8 Offline
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The catch can will either help or separate you from the purchase price.


2015 F150 2.7
2018 F350 6.2
Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434271 05/20/20 03:21 PM
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Jake_J Offline
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Generally they're not needed and a waste of money, I'd only install on a engine with known PCV blow by issues. A lot of the videos that show all the gunk that gets collected in the catch can look a lot worse than it really is as most of the gunk that's collected is generally condensation from the engine which is normal. Pulling blow by gases back into the intake is not an ideal solution but it's a compromise made for emissions reasons and for practicality. Catch cans can also cause problems as pointed out with the freezing issue, they also add a restriction to the escaping blow by gases which can cause oil leaks in other places in older diesel engines.

Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434275 05/20/20 03:26 PM
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JimPghPA Offline
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I am still on the fence regarding catch cans. Exhaust feedback is part of the problem, and they do nothing to get rid of that. And some of the best ones have a cindered brass screen, but if that clogs up you could blow the crank seals.

There are Youtube videos about catch cans and some of them bring up the point that there are a lot of direct injection engines without port injection that have a lot of miles on them and there are not a lot of engines requiring intake valve cleaning.

Last edited by JimPghPA; 05/20/20 03:26 PM.

Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434293 05/20/20 03:42 PM
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shimps1 Offline OP
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The tough part is it's all anecdotal info right now. No one has had two identical engines, run one with a can and one without, and compared them.

I am a bit nervous with my Yukon given I plan to keep it for a very long time, so I would like to maintain its performance (clean valves helping here) as long as possible. Last thing I want is to get up to 100k miles and be looking at a big cost to get the valves cleaned. Preventative maintenance is always cheaper, etc.

However, my other worry is the catch can potentially causing damage if something went wrong. As long as I remember to empty it, is there any way that it can cause damage to the engine?

I would also remove it prior to taking the truck to the dealer for any work.

Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434356 05/20/20 04:24 PM
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MrHorspwer Offline
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Originally Posted by shimps1
As long as I remember to empty it, is there any way that it can cause damage to the engine?


What's the worst that can happen?

When it gets really cold, moisture that has condensed in the line freezes, plugging the PCV system, causing excessive crankcase pressure, and blowing a front or rear crank seal.

That's about the worst that can happen.

Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434384 05/20/20 04:49 PM
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littlehulkster Offline
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Your PCV system is already precisely tuned by actual engineers and most cars have some sort of separator on them anyway.

Adding a catch can does nothing, at best, and at worst can cause problems. Most of what they're catching is water vapor, with tiny amounts of oil and fuel.

They were useful on sloppy old carbureted motors with tolerances the size of a barn door, but there's no point on a precisely tuned, computer controlled engine of today.

Last edited by littlehulkster; 05/20/20 04:54 PM.

2015 Mazda3 I 2.0
Re: Catch Cans - What's the Verdict? [Re: littlehulkster] #5434412 05/20/20 05:19 PM
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OilReport99 Offline
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Originally Posted by littlehulkster
Your PCV system is already precisely tuned by actual engineers and most cars have some sort of separator on them anyway.

Adding a catch can does nothing, at best, and at worst can cause problems. Most of what they're catching is water vapor, with tiny amounts of oil and fuel.

They were useful on sloppy old carbureted motors with tolerances the size of a barn door, but there's no point on a precisely tuned, computer controlled engine of today.


In other words: you’re just adding weight to the vehicle.
cheers


2018 Ram 1500 - VME 5W-20
Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434414 05/20/20 05:22 PM
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Rat407 Offline
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The money one will spend on these is amazing when you can make one out of an air compressor line air/water seperator.


2002 Silverado 5.3 5w-20 AMSOIL
Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434531 05/20/20 07:27 PM
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WhizkidTN Offline
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FWIW: I have them on my turbo 2.0L GDI engine. I get about 2oz of liquid nastiness for every 4K mile oil change. I'm glad this isn't going into my intake as well as lowering the octane level of my fuel (I run 93 octane and a nice tune which requires it). Worked great for me!


His: '12 Kia Optima SX - 2.0L GDI Twin-Scroll Turbo [Tuned] (88K)
>EDGE 0W-40, Fram XG9688
Her's: '14 Nissan Rogue SL AWD - 2.5L NA (103K)
>EDGE 0W-20, Fram XG6607/XG7317
Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434606 05/20/20 08:49 PM
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NYEngineer Offline
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I have a Moroso catch can on my 5.3 in my Suburban. It needs it and it works perfectly.

Re: Catch Cans - What's the Verdict? [Re: shimps1] #5434613 05/20/20 08:58 PM
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2015_PSD Offline
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I installed one on my Rubicon and has about an ounce of oil in it after 400 miles. Plenty of opinions either way, but for me, I do not want the oil it has caught from going into the intake and the combustion chamber.


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge + Ultra]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum + Mann filter]
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