Catch Can

[MrBenchMark]

I purchased my DiabloSport Predator from a third party vendor and there was nothing mentioned about having to purchase and install a catch can. If I would not have taken the time to go to DiabloSport's website out of curiousity, I never would have known anything about a catch can or having to install one. This leads me to wonder if I really do need one or if it's basically just an add on you can get by without. So my questions are...

1. Do I really need a catch can? If so, why do I need a catch can whereas before the tune I didn't?

2. What is a catch can and what is its purpose?

3. Is it easy to install?

[Mike_Levy]

You always needed a catch can, even with the stock tune. The only reason DCX didn't install one from the factory was because they're cheap.

The catch can collects the oil from the PCV system so it doesn't get into the intake and gunk it up. The gunk creates more knock and costs you power.

Very easy install, especially on the LX's.

[MrBenchMark]

You always needed a catch can, even with the stock tune. The only reason DCX didn't install one from the factory was because they're cheap.

The catch can collects the oil from the PCV system so it doesn't get into the intake and gunk it up. The gunk creates more knock and costs you power.

Very easy install, especially on the LX's.

I apologize, but I don't know what you're referring to with the abbreviations 'DCX' and 'LX'. Please clarify for me.

[Mike_Levy]

I replied to your PM. DCX is Daimler Chrysler, LX is the platform that the 300, Charger and Magnum are built on.

[1FST4DR]

You also need to remember as time goes on Diablosport continues to do R&D on the LX platforms.Think about how many revisions they have come up with to help the Dodge community.

[brandy16]

I replied to your PM. DCX is Daimler Chrysler, LX is the platform that the 300, Charger and Magnum are built on.

You dont have to have a catch can. Its a good thing to have but you can use the predator with out it.

[mikel]

I replied to your PM. DCX is Daimler Chrysler, LX is the platform that the 300, Charger and Magnum are built on.

You dont have to have a catch can. Its a good thing to have but you can use the predator with out it.

Well, true, you dont NEED it, but, it has been shown that the PCV system does indeed transfer oil to the intake, and oil does NOT burn well, and WILL lead to detonation and a loss of power/performance and eventually worsening mileage.

[ZMagnum]

I think the main reason there's not factory oil catch can is the additional maintenance of having to dump it every once in a while. We have no problem doing it but how many "regular" owners would be willing? People would see it as a weakness in the Hemi engine.

[rfoker]

I think the main reason there's not factory oil catch can is the additional maintenance of having to dump it every once in a while. We have no problem doing it but how many "regular" owners would be willing? People would see it as a weakness in the Hemi engine.

Most factory vehicles are not equipt and have the same issue. My Mustang had the same problem. Not a necessity and especially not for a stock vehicle, but if you run high rpms constantly, you'll wanna get a catch can or an air/oil seperator as I had on my Mustang. I made mine myself. can't make the tuner yourself, but you can with a catch can!

[jnmarshall]

Never had one and don't need one. For over 40 years never had any such problem with any car, even those I race. I played with one 5 years ago on a turbo charged car I raced. The "marketing" reason you needed to have it was the blowby gasses and oils would clog up the intercooler. After 3 months, I took it off and redid the plumbing. 4 years and 110k+ miles later, the IC and throttle body are still clean. For a couple of years, it became more "bling" then anything else. Chrome finishes, cool looking lines and stuff. The bling seems to have died.

Spend you money on other "go fast" parts first:) The tuner was a good start for many improvements over stock.

[duster360]

Never had one and don't need one. For over 40 years never had any such problem with any car, even those I race. I played with one 5 years ago on a turbo charged car I raced. The "marketing" reason you needed to have it was the blowby gasses and oils would clog up the intercooler. After 3 months, I took it off and redid the plumbing. 4 years and 110k+ miles later, the IC and throttle body are still clean. For a couple of years, it became more "bling" then anything else. Chrome finishes, cool looking lines and stuff. The bling seems to have died.

Spend you money on other "go fast" parts first:) The tuner was a good start for many improvements over stock.

I agree to most of this and have always thought that "catch cans" were a dubious improvement and are often priced 4X what they're worth.

With that said, used motor oil has a pretty low Octane #. So if too much oil is getting into the manifold, its an issue.

[Quick]

Ummm, have you guys seen the pics when people remove their intake manifold? It looks like a little perc pond in the bottom. Don't know about the 5.7L but the 6.1L is prone to this like the LS motors. Look at the first post in the link. This isn't that unusual. Might not effect anything with stock tuning and stock engine life but this can't be ideal for performance tuning.

http://www.srtconnection.com/forums/sho ... hp?t=14666

[Mike_Levy]

Ummm, have you guys seen the pics when people remove their intake manifold? It looks like a little perc pond in the bottom.

Theres no point in even discussing it with them. They're both living in the olden days when gasoline was leaded and compression was low. Trying to make them understand the way things are now in the new millenium is pointless. They're always going to go back to what they learned when they grew up, regardless of how irrelavent it is now.

[duster360]

have you guys seen the pics when people remove their intake manifold?

Yeah thats why I said:

if too much oil is getting into the manifold, its an issue.

[duster360]

Trying to make them understand the way things are now in the new millenium is pointless.

Mike,
I seriously doubt you're competant enough to be so condesending.

Have you ever tuned anything with EFI,,ever?
I'm not talking this sissy girl Predator bs(No offense DS). I'm talking full on, powertrain control, when you have to fab your own crank sensors, fuel systems, and build your fuel and ignition maps from scratch. When you have to tune every thing! Coolent temp compensation, Acelleration compesation, Air temp, O2 transport delay, coil dwells(coil on plug), Injection angles, ect

yeah,,,,,, didn't think so. Do you even know what half those things even are?

I've been tuning full stand alone EFIs for over 10 years and have at least some experience with most major aftermarkets(FAST, Accell DFI, Holley, MOTEC, HALTECH, AEM) and a few OEM flashers (SCT, DSP, CMR just with the NGC) I've tuned everything from 500hp V8 to a 600cc 15000rpm Formula car(f-sae). Is that "new millenium" enough for you?

When you stop needing to pay others to tune your ride for you and stop regurgitating every half-baked "mod list" you see on the internet, then you might be half the way to where I am now.

Hell, I'm half-thinking about applying for DS position as "Advanced Calibration/Tuning Specialist",, but I doubt the wife would move to FL,,besides I get paid pretty well now as a Mechancal Design Engineer.
____________________________________________________________
Sorry for the rant, Back OT: As an engineer I'm skeptical about everything especially "advice" from wannabes.

1) I wonder how much oil in the intake is actually caused by installing goof ass, 0hp adding CAI, which reroute(misroute?) the factory PCV system?

2) At what rate does the oil to accumulate?
Are the sensational pics 30k miles worth of oil? Which would mean a miniscule amount is actually collecting in the plenum and MUCH less is getting to the cylinder(see #3)

3)Here's an obvious one: If the Oil is STILL in the intake, its NOT getting into the cylinder, right?

Old school: Ever heard of fuel puddling? (I doubt it) Its when the unevaporated fuel falls out of the air stream ans "puddels in the intake. Usually from an abrupt change in direction of the air stream. One of the major benefits from Port fuel injection is the greater latitude given to intake manifold designers because since the manifold only moved air, they no longer had to worry about fuel puddeling. The Oil is probably doing the same thing ESPECIALLY at WOT. At WOT the air flow velocity is too high to keep any oil droplets, which are several magnitudes more dense than the air, suspended in the air stream all the way to the Valve.

4) If a single drop of oil is tabboo, Why vent the crank case into the intake at all? A $400 can is not 100% effective anyway. Just disconnect the PCV system entirely from the intake and vent the crankcase properly.