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DIY catch can material? #4704551
03/23/18 06:06 PM
03/23/18 06:06 PM
Joined: Apr 2004
Posts: 441
ON, Canada
yugrus Offline OP
yugrus  Offline OP
Joined: Apr 2004
Posts: 441
ON, Canada
I didn't get a response in older related thread, so I will try again.

I have two different catch cans connected sequentially in my Tahoe. That works well, but now I'd like a catch can in our Mazda, and I will transfer this setup there.

I am thinking about building a large catch can out of 3 or 4" DWV copper pipe, with copper tube going almost all the way to the bottom, and steel wool in the middle. Maybe even the accending spiral out of steel wool. I think copper will work better then PVC water pipe for heat transfer.

I don't have space constraints under the hood of Tahoe for this purpose. Maybe I will even place it under the bumper cover or in the wheel well.

My question is about copper as a suitable material. Is it acceptable for that application? Would the metal react in some way with catched stuff that would produce some chemicals detrimental to the engine internals? Would copper corrode in contact with steel wool and caught water?

Maybe stainless exhaust flex pipe or straight tubing will work better? Thick walls though...

Also, would PVC clear vacuum hose work PCV with gases? Thinking about 3/4 ID hoses to lessen restriction...

Thank you for your help!


'14 Chevrolet Tahoe
'15 Mazda CX-5
Re: DIY catch can material? [Re: yugrus] #4704637
03/23/18 07:05 PM
03/23/18 07:05 PM
Joined: May 2010
Posts: 9,626
out there
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,626
out there
Copper would transfer heat better, which is what i would not want. I would want as little heat in the catch can as possible.
i mean you want the water and oil vapor to condense in the catch can and not move on to the intake. For that , the catch can needs to be cooler, a copper pipe seems like it would conduct more heat to the center of the catch can.

I wonder if something like this on the catch can would make it condense better.


Last edited by spasm3; 03/23/18 07:30 PM.

13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
Re: DIY catch can material? [Re: yugrus] #4704665
03/23/18 07:33 PM
03/23/18 07:33 PM
Joined: Apr 2004
Posts: 441
ON, Canada
yugrus Offline OP
yugrus  Offline OP
Joined: Apr 2004
Posts: 441
ON, Canada
Hmm, I thought otherwise about heat transfer... I guess, it depends on the can's location. Sump gases should be quite warm at operational temperature. Warmer then under the hood in any case. Warmer still then in the wheel well or behind the bumper cover... So it appears to me that the heat transfer would be from the core to the outside.
But I agree, something to think about.

Last edited by yugrus; 03/23/18 07:43 PM.

'14 Chevrolet Tahoe
'15 Mazda CX-5
Re: DIY catch can material? [Re: yugrus] #4704692
03/23/18 07:55 PM
03/23/18 07:55 PM
Joined: Oct 2005
Posts: 5,133
Fredericksburg, VA
JAG Offline
JAG  Offline
Joined: Oct 2005
Posts: 5,133
Fredericksburg, VA
The copper will corrode somewhat but I donít know if if would be a problem. I doubt it though. Use stainless steel wool.

If you could put it outside of the hot under hood area, it would really help with condensing the liquids. There you would want it to be a highly conductive material. Under the hood, that property is less important. The gasses flowing through it there are probably warm and the underhood air is somewhere between cold and hot, depending on ambient temperature and engine temperature.

Re: DIY catch can material? [Re: yugrus] #4704805
03/23/18 11:03 PM
03/23/18 11:03 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
Originally Posted By: yugrus
I Would copper corrode in contact with steel wool and caught water?



Nope, because the steel wool, being lower in the electrochemical series, will corrode for both of them, unless stainless.

For the rest, you don't give dimensions, but you want something thin walled, to give good heat transfer.

Beer can.

Re: DIY catch can material? [Re: yugrus] #4704862
03/24/18 03:18 AM
03/24/18 03:18 AM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
Taiwan
I suppose a beer can might collapse if it sees negative pressure though.

Re: DIY catch can material? [Re: yugrus] #4704868
03/24/18 03:38 AM
03/24/18 03:38 AM
Joined: Jul 2003
Posts: 4,961
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,961
New Zealand
I've sucked a few beer cans dry, and they don't implode.


1987 BMW R65 - Aegis SAE30
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: DIY catch can material? [Re: yugrus] #4704873
03/24/18 04:05 AM
03/24/18 04:05 AM
Joined: Dec 2002
Posts: 41,965
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 41,965
'Stralia
In Oz, a lot of the 4 wheelers are making theirs out of PVC piping, and open pore foam.

When it comes to catching mist, the bigger the expansion ratio the better.

Read your post earlier, and have been pondering.

You could put a remote oil filter mount, and put the biggest, cheapest oil filter you can find on it (no ADBV). The filter media will coallesce the oil droplets, which will ultimately fall to the bottom.

Unscrew and dump, or unscrew, throw away, and replace.

Re: DIY catch can material? [Re: yugrus] #4704896
03/24/18 05:30 AM
03/24/18 05:30 AM
Joined: Apr 2004
Posts: 441
ON, Canada
yugrus Offline OP
yugrus  Offline OP
Joined: Apr 2004
Posts: 441
ON, Canada
Thank you for suggestions gents!
Few years ago I experimented with air compressor filter as catch can, and found that using its native filtering media was impractical. It gets clogged really fast, impeding the flow. So remote oil filter is a good approach, but I guess, filter itself should be cut, hollowed and its internals modified. I agree that the expansion ratio is very important here. I think big filters are still smaller then what I have in mind, diameter - wise. Are there any with 3-4" ID? With 3/4" ID central inlet pipe that should give me good expansion ratio at 8-10" container length or more.

As for beer can, good thin wall container, but not long enough, even the bigger one, and cumbersome to make serviceable.

Stainless wool is a great idea!

I'm curious if I go with thin-wall copper pipe, the copper would show in UOA, implying the reaction with PCV gases. Maybe this would mean nothing, maybe otherwise. I just don't know.

I can also take stainless exhaust pipe and mill the walls thinner. Can't solder end-cap on that though. Can MIG it, probably. Depends on how thin the steel is.

Another thought was the addition of the electric vacuum pump to maintain constant vacuum in the sump. I'd use the check valves at the intake and the pump, the T-connector, and the pressure transducer. The pump would only kick in when the intake vacuum drops, maintaining proper increased PCV flow evacuation, sealing piston rings, etc. Looks like this is what the stock PCV system is lacking at higher RPMs. Intermittent nature of the pump operation should prolong it's life, and the system is fail-safe. The pump would vent into the atmosphere or into exhaust post-cat. Providing that the catch can does its job, the vented gas should be harmless. I would need to tune it for the transitional period of low vacuum, so that at least something creates it in the sump whatever the engine is doing.

I'm really open for suggestions at this point, thank you all very much!


'14 Chevrolet Tahoe
'15 Mazda CX-5
Re: DIY catch can material? [Re: yugrus] #4704927
03/24/18 06:25 AM
03/24/18 06:25 AM
Joined: Dec 2016
Posts: 7,466
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,466
Waco, TX
I wouldn't use dissimilar metals.

Fill it with these:





"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: DIY catch can material? [Re: yugrus] #4704953
03/24/18 06:49 AM
03/24/18 06:49 AM
Joined: Dec 2016
Posts: 7,466
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,466
Waco, TX
BTW, "air/oil separators" for small aircraft are a simple aluminium can with plain aluminum window screen, cut to width the same as the length of the can (about 6" or so) and just wrapped around a small wooden dowel and rolled up until the roll will fit inside the can. Pretty simple.

On these, you have:
1) airflow (with oil also) going in
2) airflow out
3) drain back to the sump



"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: DIY catch can material? [Re: yugrus] #4704955
03/24/18 06:53 AM
03/24/18 06:53 AM
Joined: Dec 2016
Posts: 7,466
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,466
Waco, TX
This kind come apart for cleaning
:





"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: DIY catch can material? [Re: Linctex] #4705004
03/24/18 07:35 AM
03/24/18 07:35 AM
Joined: Feb 2009
Posts: 1,629
wv
krismoriah72 Offline
krismoriah72  Offline
Joined: Feb 2009
Posts: 1,629
wv
If you want a big one...


Re: DIY catch can material? [Re: yugrus] #4705060
03/24/18 08:39 AM
03/24/18 08:39 AM
Joined: Dec 2013
Posts: 3,989
Manchester, England
Olas Offline
Olas  Offline
Joined: Dec 2013
Posts: 3,989
Manchester, England
http://www.google.co.uk/url?sa=i&rct=j&q=vacuum%20pump%20catch%20can&source=images&cd=&ved=2ahUKEwjVt6byl4XaAhXRfFAKHX1SCu4Qjxx6BAgAEAI&url=http%3A%2F%2Fwww.stangtv.com%2Ftech-stories%2Fengine%2Ftech-gz-motorsports-vp104-super-pro-33-cfm-vacuum-pump%2F&psig=AOvVaw17MYs-7fiiiLq0HJ2zzhJL&ust=152198866823391


Cable ties should hold it
Re: DIY catch can material? [Re: yugrus] #4705111
03/24/18 09:25 AM
03/24/18 09:25 AM
Joined: Jan 2018
Posts: 265
KS
red7404 Offline
red7404  Offline
Joined: Jan 2018
Posts: 265
KS
i bought 2 Kobalt cans like krismoriah72 listed. but not in yet. BUT could you use a small industrial air pump and just dump the air over board?

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