Engineering Explained Oil Catch Can

[gixxer]

Perhaps this could be a sticky.

Interesting to hear about the research.

 

[BrewCrew]

The HEMI is Sequential Muti-port Injected i believe so we should be fine without a catch can. Could be mistaken.

 

[Ramm5.7]

The HEMI is Sequential Muti-port Injected i believe so we should be fine without a catch can. Could be mistaken.

Just dumped mine yesterday, forgot to tske a pic but holy moly theres alot of crap I dont want anywhere NEAR my throttle body.

 

[Casper]

The Hemi has relatively higher compression than many engines, and like everyone else has transitioned to short piston skirts and fewer rings per piston. The result is a lot of blow-by. Blow-by is unburned gasoline, and carbon and combustion by-products that pressurize the crankcase and along with water vapor, have to be removed and "disposed of."
FCA uses vacuum from the throttle body to do that and all that swill goes right through your intake manifold leaving an oily residue, and across your operating temperature (hot metal) intake valves to be poorly combusted in your cylinders, leaving more carbon and yiltch behind.

My catch can captures 2-3 oz of that nasty yiltch every 2K miles or 4-6 oz between oil changes. I've got 80K miles on my Hemi. Without a can that would mean (roughly) 5 oz X 40 oil changes = 200oz or about 1.5 GALLONS of that filth would have plated out my intake valves and deposited in my combustion chamber.

So skip the can if you want.....its your vehicle.

 

[heefageLA]

The HEMI is Sequential Muti-port Injected i believe so we should be fine without a catch can. Could be mistaken.

https://www.ramforum.com/threads/oil-catch-can-dump-photos.82748/page-86


Take a look through this thread and see how much our trucks need a catch can...

 

[BrewCrew]

I am still on the fringe. These catch cans do catch oil...never disputed that. However, considering where it it reintroduced into your engine, it shouldn't matter much at all. Its hard for me to believe that the dozens of Engineers who worked to design this Truck/Engine would have overlooked a $100 part. Doesn't seem that critical to me TBH. Each to one's own though.

 

[heefageLA]

I am still on the fringe. These catch cans do catch oil...never disputed that. However, considering where it it reintroduced into your engine, it shouldn't matter much at all. Its hard for me to believe that the dozens of Engineers who worked to design this Truck/Engine would have overlooked a $100 part. Doesn't seem that critical to me TBH. Each to one's own though.

They didnt overlook a $100 part... They realized that Joe Blow and Patty Puff off the streets arent going to take the time, or know-how, to dump the can once every few months. Some folks dont even change their own oil. Can you imagine when the can fills up and dumps all that liquid into your intake? Can you imagine if every vehicle had a catch can?


EDIT: And these car manufacturers dont give a crap about how long these motors last. They WANT them to be replaced. Everything now-a-days has a shelf life. They expect these vehicles to last about 250,000k, at best, and then be replaced.

 

[mboymopar]

After running my CC for a year and dumping it every 2500 miles, and 1500 in the winter.
I have saved a lot of water running into the engine.

 

[BrewCrew]

Its my understanding that there is a separator built into the valve cover to deal with this. Also i believe these things are not approved in CA so I'm SOL anyways.

 

[SyN]

Think about this for 3.4 seconds.
(If manufacturers incorporated a OEM CC when needed) with the average owner whom can barely remember to perform or have done - just their average services.
Even bothering remembering to pop the hood & check or dump the level in the catch can - Let alone find it.

it's your basic Oh $hit just waiting to happen.

Adding a CC can only be a positive - The only negative could be is if The owner neglects/forgets about it.

Takes about 30min to install with basic tools & 5min to maintain!

 

[heefageLA]

Its my understanding that there is a separator built into the valve cover to deal with this. Also i believe these things are not approved in CA so I'm SOL anyways.

If there is a separator built in, where is all the fluid stored? Does it dump back into the crank case? Im googling diagrams as we speak and cant find anything. On my truck, a hose runs directly from the PCV valve at the back of the motor straight into the intake manifold.

 

[Pull Ya]

I am still on the fringe. These catch cans do catch oil...never disputed that. However, considering where it it reintroduced into your engine, it shouldn't matter much at all. Its hard for me to believe that the dozens of Engineers who worked to design this Truck/Engine would have overlooked a $100 part. Doesn't seem that critical to me TBH. Each to one's own though.

Let me try to use this analogy. The "engineers" cut a hole and installed a lid for a cabin air filter, however DID NOT install the filter itself. The filters are $10-$15 each. I think it is more about additional cost to the manufacture to install the catch can. It's an optional mod you can make /or not. I think there is no question about the usefulness of a catch can. Your truck, your call.
Jay

 

[BrewCrew]

Hey if it helps your truck and gives you a piece of mind then by all means go for it. All I'm saying is that i have never run one and i have never had an issue directly linked to not running one. For me i would rather not have to deal with an extra maintenance component. That's just my 2 cents and like i said before each to one's own.

 

[Casper]

I am still on the fringe. These catch cans do catch oil...never disputed that. However, considering where it it reintroduced into your engine, it shouldn't matter much at all. Its hard for me to believe that the dozens of Engineers who worked to design this Truck/Engine would have overlooked a $100 part. Doesn't seem that critical to me TBH. Each to one's own though.

***
Remember, the bottom-line ($) always trumps proper engineering--good enough rules the day. Dumping PCV yiltch into the intake is good enough for the engine to outlast its warranty--then the consequences are YOUR problem not FCA's.

 

[Casper]

Its my understanding that there is a separator built into the valve cover to deal with this. Also i believe these things are not approved in CA so I'm SOL anyways.

***
Nope. No separator. PCV pumps lots of nasty milkshake right into your intake manifold.

OBTW that nasty stuff can cause pre-detonation which when detected would induce the PCM to pull timing. That is one of the reasons FCA recommends mid-tier gas over 87 Octane.

But hey, its your $, and your truck.

What could possibly go wrong...go wrong....go wrong...…?

 

[Casper]

They didnt overlook a $100 part... They realized that Joe Blow and Patty Smith off the streets arent going to take the time, or know-how, to dump the can once every few months. Some folks dont even change their own oil. Can you imagine when the can fills up and dumps all that liquid into your intake? Can you imagine if every vehicle had a catch can?


EDIT: And these car manufacturers dont give a crap about how long these motors last. They WANT them to be replaced. Everything now-a-days has a shelf life. They expect these vehicles to last about 250,000k, at best, and then be replaced.

***
Actually what happens is the TB begins to sip slugs of yiltch and you get an uneven idle. I made that mistake once and found a not quite full C/C. Emptied it and the idle corrected. I shot my intake with Seafoam just to be safe. TB is still clean as can be.

 

[Casper]

Content deleted: I Duplicate posted

 

[Tim Garceau]

Cold climates are the reason, but they R&D engines in the extreme elements and design the PCV to withstand the warranty period. Consumers do not want to stick a dime more than gas for an entire year on modern vehicles, this would be extremely counterproductive. Oil changes are going 10-20K/year, we're lazy and not mechanically inclined as a nation.

 

[Pull Ya]

Brew--Do Cal. emission rules really preclude the use of a catch can? I thought that you mentioned that.
Jay

 

[BrewCrew]

Brew--Do Cal. emission rules really preclude the use of a catch can? I thought that you mentioned that.
Jay

I am not 100% sure. I have heard yes and no. Considering its California it might be a rule that no one knows about.

Either way I probably wont run one.....the last truck that i retired at 350k didn't have one and it ran fine.