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6.6 - Catch Can - Final Answer

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By 6.6HD
in 6.6L Gas V8 (L8T)

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Pryme Senior Enthusiast

Pryme

Posted
Posted
2 hours ago, Jettech1 said:

That's a really great question.  I've done the seafoam thing to many engines in the past....here's a tip though, best place to do it is in a school parking lot or empty huge parking lot on a Sunday because you will be putting out so much smoke from the tailpipe that people will think something is on fire....lol........

 

I do run a catch can on my 6.6l gas engine but I'm curious as to how much it didn't "catch".  In a few weeks I'm going to install the S&B cold air intake on it.  Seems like it might be good time to shove a boroscope in the intake to see what really is going on.  I bought a cheap boroscope for my iphone years ago that honestly sucked.  I think I need to buy one that will work with my android phone with much better viewing quality... 

Just tell delta you really need one for use in the shop haha

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mrjulian416
mrjulian416

The passenger side tube is the "fresh air" line allowing clean, metered air a path into/out of the engine.  It is not a "foul air" line letting blowby out of the engine.  There is much higher vacuum a

It's Tim
It's Tim

Peeps are worried to death about a little engine oil in the intake manifold but seemly could less that their arteries are almost plugged solid from fat food. ?

It's Tim
It's Tim

So... this dudes an "expert" in "catch cans" but failed to notice the engine was only running on 7 cylinders multiple times? Probably time to find a different mechanic and not waste money on a snake o

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Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
On 3/22/2023 at 9:51 PM, Pryme said:

Just tell delta you really need one for use in the shop haha

Oddly enough I have brought them home before back when the camera quality was terrible on the cheap ebay ones.

  • 3 weeks later...
carkhz316 Enthusiast

carkhz316

Posted
Posted (edited)

I added one to my '21 last month. This is my first vehicle with direct injection, and I am aware that despite the opinions on catch cans, coking/ carbon on valves is absolutely a concern. Further, I only live a couple miles from work, so my truck regularly sees short trips at least until the warmer months when I bike to work. This is only a few hundred miles/ few weeks worth, or about 1/4 cup of mostly condensation.

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Edited by carkhz316
Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
On 4/14/2023 at 9:02 AM, carkhz316 said:

I added one to my '21 last month. This is my first vehicle with direct injection, and I am aware that despite the opinions on catch cans, coking/ carbon on valves is absolutely a concern. Further, I only live a couple miles from work, so my truck regularly sees short trips at least until the warmer months when I bike to work. This is only a few hundred miles/ few weeks worth, or about 1/4 cup of mostly condensation.

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I used to live 3 miles from work.  Super hard on the engine and oil.  I would like to be the first one to say......you need to hit the highway at least once a week...foot to the floor....get it hot for a while.  Burn off that condensation.  I never see that in my catch can but damn....look under your oil cap.  If it has that same moisture or color in it, you need to heat that baby up for a while.  Idling will not do the trick.  Run it hard....don't get a ticket....but run it hard and let the engine burn that moisture off. 

carkhz316 Enthusiast

carkhz316

Posted
Posted (edited)
13 hours ago, Jettech1 said:

I used to live 3 miles from work.  Super hard on the engine and oil.  I would like to be the first one to say......you need to hit the highway at least once a week...foot to the floor....get it hot for a while.  Burn off that condensation.  I never see that in my catch can but damn....look under your oil cap.  If it has that same moisture or color in it, you need to heat that baby up for a while.  Idling will not do the trick.  Run it hard....don't get a ticket....but run it hard and let the engine burn that moisture off. 

To clarify, I regularly go on longer drives to visit friends, family; do side jobs, errands, etc on almost a weekly basis. Its just Monday through Friday is typically to work and back. Also, I attribute this largely to the huge tempurature swings we have. In the last month, its gone from -10 to 75 degrees, with most days swinging back and forth between freezing temps and warmer. I know this generates way more condensation than the heat of summer, or even the dead cold of winter alone as our family car does the same thing. My example above is just a worst case scenario because of the time of year and climate here.

Edited by carkhz316
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  • 11 months later...
lineman1234 Enthusiast

lineman1234

Posted
Posted (edited)

Might as well wake this up. New to the forum. I just installed a catch can 3 days ago. It was about 25f hear each day, checked and emptied, emptied 3 times. First 2 times same miles, same rout, 44  miles each trip, 3rd today, 3/24/24, todays miles about 70. 

... First check was oil at 5,200 miles, from new, about 1.5 tablespoons of stuff in the jug. Next was next day, i changed oil and filter, about the same, but clearer. Today back to milky. Each time was emptied and wiped clean. 

... Speeds were 57mph on rural highways. No stop and go city.

.... The catch can seems to be doing something on my new now with about 5,300ish miles on it. 2024, regular cab, 3500, 4x4 WT, obviously the 6.6 gasser. 

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Edited by lineman1234
Pryme Senior Enthusiast

Pryme

Posted
Posted

Has anyone put a catch can on a port injection equipped vehicle? Wonder what they catch. I’ve read so many conflicting reports and stories regarding these things. 

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lineman1234 Enthusiast

lineman1234

Posted
Posted

I am sure my pickup would go for a long time without a catch can. Odds are no more or less than if i didnt add one. 

...   I do things as an experiment. This is the first vehicle i have installed one on. 

... I find it interesting first put on with the mentioned used from new, the oil at 5,200 miles on 44 miles was milky water, then brand new oil same 44 miles, pretty much just water, then the next day, 70 miles, back to milky water. 

...

It is interesting ( and i am no mechanic ) conflicting chat on such a thing as a catch can. One article sais it ONLY works when at idle. Well, mine all times, was start, let warm about a minute as mentioned about 25f hear, and off, a couple of stop signs thats it, so, that would be a lot of stuff from that short idle.

...

I will mention, that the one i installed goes from the pcv valve to the drivers side valve cover, replacing the plastic tube that did that. So, per say,,, it doesnt go into the intake there, just into the valve cover. The other side goes into the intake. Or comes from the intake, to, the valve cover.

...

I,,, for the heck of it, just ordered another catch can, same thing, to install/replace, on the other tube on the passengers side that goes from the valve cover to the intake, directly into the intake box, not through the filter box. 

...

It will be interesting to see if it changes with the summer temps and summer fuel or not. Hear in the very upper MN area, its winter for a long time, fairly dry, and 10%-15% ethanol fuel, mostly. Hard to find non ethanol. Maybe the vapor wont condense in the can when its warm to hot out. 

 

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lineman1234 Enthusiast

lineman1234

Posted
Posted

I will adddddd. I will not be using the mentioned can,,, when it is very cold out for long times, as i wouldnt want to take the chance of anything freezing. I can leave water in an insulated coffee mug, in a cup holder, and it will freeze overnight. Depending on the temp. Not uncommon to be very cold hear.

...

I wont be hear for next winter, as thats why i got the 3500, to go back to retired fulltime travel/rving, going north for the summer and south for the winter. 

 

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Jayroc7113 Enthusiast

Jayroc7113

Posted
Posted

I have read all the comments here about the pros and cons of a catch can. I never planned to do anything other than fuel induction servicing at about 60k miles. It wasn't until last week when the truck gave an "add engine oil" warning that I got serious about my amount of unknown oil consumption. It was then that I learned I'm burning a quart in 1500 miles. Then this week it ran horribly and set a rough idle and random multiple misfire code. Serviced the throttle body and did an old school fuel induction IV treatment on it and the engine went back to like new idling. I tow every day so if I can catch any of the quart of oil I'm losing then that's a bonus to me. If I can't stop the oil loss at least I can save some of it from the intake valves. Just my .02 cents!! Can installed on driver side today. 

lineman1234 Enthusiast

lineman1234

Posted
Posted

The oily water i am catching. About 1.5 tablespoons per 50ish miles, or less, is just the can from the pcv valve to the drivers side front valve cover. So it per say,,, is putting that back in the system, with the stock tube. My driving, isnt city/stop and go. It is rural highway, so it comes up to temp.

... It wont be till i get and install the one on the passengers side that goes to/from the intake/front valve cover passengers side. That would be where, if it is Bunning any. Or putting any water and or oil in the intake part. 

... My 2024 6.6 gasser has no noticeable oil usage at 5,600 miles. I changed oil at 5,200. 

... What i get in the can, is 99% water. 

lineman1234 Enthusiast

lineman1234

Posted
Posted
4 hours ago, Pryme said:

These catch can manufacturers sure have a nice gig going. 
 

 

So you dont really care what my results will be when i do put another can on the port side, as you asked, earlier. 

Pryme Senior Enthusiast

Pryme

Posted
Posted
6 hours ago, lineman1234 said:

So you dont really care what my results will be when i do put another can on the port side, as you asked, earlier. 

I think it’s interesting but I think if you toss one on a port injected engine you will also get liquid in the can. 

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