I spent $12 and made an oil catch can. My suprise is the amount of oil it caught after 70miles of driving. Now I can only imagine how much oil is puddled in the bottom of my intake manifold.

 

Forgive my ignorance, this is my first dodge.
Can you explain this to me?

 

I knew it would only take a little time before someone would fab one up, what fittings did you get and what lines did you cut?, maybe do a write up . Good job

 

yeah i'm looking to add one also. I changed my throttle body when I had 10k on my truck and was surprised at how much oil was in the intake. A writeup would be greatly appreciated.

 

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subscribed.

 

DANG CHRISTIAN.............that is a lot of want..............

 

A PCV catch can or filter is something I'm doing to my VW as soon as I get back to the US, and to the Ram, as soon as I pick it up (again, when I get back to the US).

I'm thinking that I'll spend the money for the Mann Provent 200 on the VW. A lot of people run them on the VW TDIs, with very good results in preventing gummed up intake manifolds. http://www.republicsales.com/product...annprovent.php

For the Ram I'll probably order the Billet Technology catch can, in the black anodized finish. It's made for the LX cars, but it's basically the same engine, and I'm sure I can rig up a proper mount for it. http://www.shophemi.com/p-1264-57l-6...echnology.aspx

Main reason for going with one of those rather than a home-made version is appearance...I want to keep the underhood area looking like everything could have come from the factory, since all the smog tests in California include a visual inspection under the hood. Plus I'm a little OCD about keeping vehicles clean, in good shape, and looking like everything came from the factory, even if it didn't.

 

The need for a catch can/PCV filter isn't a Dodge thing. All vehicles with a positive crankcase ventilation system potentially have the need for a catch can or a PCV filter...and unless I'm mistaken, pretty much every vehicle on the road has some sort of PCV system. I say need...I'm sure a lot of people would debate me on whether it's a need or not. But here's my reasoning behind it.

When your piston rises and the valves are closed, air is compressed in the cylinder. The only way out for that air is either through the valves opening, or past the piston rings. Piston rings do a great job at sealing, but some of that compressed air will still get past them.

Once the air is past the rings, it's in your crankcase. If pressure builds up in there, you can blow the seal on your oil pan...not a good thing, because that creates an oil leak. Also, as the engine warms up, the air warms up, and warm air takes up more space than cold air, so pressure builds, even if your rings are in perfect condition. That air has tiny droplets of oil in it...as your crank turns and oil gets pumped around, there will be hot oil vapors in there.

Due to emissions requirements, that pressurized air with oil vapor in it can't be vented to the atmosphere. So manufacturers use a PCV system to relieve pressure by routing the air back into your air intake.

The issue is the oil vapors. That vapor will get into your intake manifold and can stick to the walls. When people talk about carbon buildup in their intake, or oily stuff on their intake manifold, that's due to the PCV system.

All a catch can or PCV filter does is take the line that runs to your intake and puts a filtering element in it. The oil vapors hit the filtering element and collect there, then drip into a container...the catch can. This can help prevent oily stuff from getting into your intake, and can help prevent carbon buildup as well. The carbon buildup is just the oil hitting something hot, sticking to it, and baking on there.

As a side note, on diesels that run aggressive EGR, the combination of PCV vapors (wet) and the tiny diesel particulates from EGR (dry) can mix and build up sludge in the intake manifold or intercooler. I'd bet that if you googled "intake sludge" you'd hit on a WHOLE bunch of stuff dealing with VW TDIs. The new ones are not nearly as bad due to redesigning of parts, but the potential is still there. Not an issue with gas engines because the exhaust particulates are much much smaller.

And as another side note, I've been reading around here about owners mentioning a blue puff of smoke on startup...I'd bet that this is just the oily PCV vapors hitting the intake manifold, then as the engine cools they condense and drip down towards the valves. As your engine starts, the oil gets sucked into the combustion chamber, and there's your puff of blue smoke.

Is it all a big deal? Probably not. I'm sure there are thousands of hemi owners who have driven hundreds of thousands of miles with no issues due to PCV operation.

But those are just my thoughts on it.

 

Soldierguy - good explanation. And thanks for "soldiering"!