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What is a catch can? #4568876
11/09/17 12:33 PM
11/09/17 12:33 PM
Joined: Sep 2014
Posts: 1,152
Missouri
chiefsfan1 Offline OP
chiefsfan1  Offline OP
Joined: Sep 2014
Posts: 1,152
Missouri
Alright I have read on this board people using catch cans.
Now this is dumb but what is that? shrug


MacBean Clan Motto: Touch Not A Catt Bot A Targe. (Don't touch this cat without a shield).


2011 Toyota Camry XLE 2.5 I4
2014 Escape SE 1.6 EcoBoost AWD
Re: What is a catch can? [Re: chiefsfan1] #4568878
11/09/17 12:38 PM
11/09/17 12:38 PM
Joined: Aug 2008
Posts: 21,178
ON, Canada eh?
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 21,178
ON, Canada eh?
It condenses oily vapors from the crankcase PCV / Breather hose system before allowing it go back into the engine via the throttle body or intake so that only air returns and not oil. Although there is question about their effectiveness in daily drivers. It cuts down on the oil that is burned or that can leave gunky residue on things like valves etc.






Last edited by StevieC; 11/09/17 12:43 PM.

'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: What is a catch can? [Re: chiefsfan1] #4568885
11/09/17 12:44 PM
11/09/17 12:44 PM
Joined: Sep 2014
Posts: 1,152
Missouri
chiefsfan1 Offline OP
chiefsfan1  Offline OP
Joined: Sep 2014
Posts: 1,152
Missouri
Interesting. Thanks! I research them. Having s Eco Boost had me thinking.


MacBean Clan Motto: Touch Not A Catt Bot A Targe. (Don't touch this cat without a shield).


2011 Toyota Camry XLE 2.5 I4
2014 Escape SE 1.6 EcoBoost AWD
Re: What is a catch can? [Re: chiefsfan1] #4568891
11/09/17 12:53 PM
11/09/17 12:53 PM
Joined: Aug 2008
Posts: 21,178
ON, Canada eh?
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 21,178
ON, Canada eh?
If you do put one in put something in that will help the oil condense before returning because of high under hood temperatures it could keep the oil-vapor in vapor right through the entire can and back into the system. Some folks will put the can in the bumper or in front of the radiator to keep it cooler and condense the vapor. Just make sure where you put it, it is accessible because it will need emptying if it catches anything.


Last edited by StevieC; 11/09/17 12:54 PM.

'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: What is a catch can? [Re: chiefsfan1] #4568902
11/09/17 01:01 PM
11/09/17 01:01 PM
Joined: May 2012
Posts: 1,824
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 1,824
The land of USA-made Subies!
Most of the catch cans I've seen that are effective usually have a steel-wool stuffing or wire mesh to not only increase the surface area of the 'catch' material and thereby make it more effective, but the hidden and likely main reason for this is that since the PCV gasses have to navigate a longer path through the steel wool, the gas cools off significantly. This may be why some folks stick the can in the bumper or in the airflow- they dislike the slight mess the mesh creates and think it's unneeded, hindering the performance of their can.

P.S.- 'most' port-injected daily drivers will probably not 'need' a catch can. If you have a GDI engine, it may certainly help with both LSPI and intake valve deposits.

Re: What is a catch can? [Re: SubieRubyRoo] #4568904
11/09/17 01:06 PM
11/09/17 01:06 PM
Joined: Sep 2011
Posts: 3,362
Somewhere
itguy08 Offline
itguy08  Offline
Joined: Sep 2011
Posts: 3,362
Somewhere
Originally Posted By: SubieRubyRoo
P.S.- 'most' port-injected daily drivers will probably not 'need' a catch can. If you have a GDI engine, it may certainly help with both LSPI and intake valve deposits.


Can't speak for LSPI but cans do next to nothing for intake deposits. Ask the VW/Audi guys who had them real bad, installed cans, and they did nothing to help.

Re: What is a catch can? [Re: chiefsfan1] #4568906
11/09/17 01:08 PM
11/09/17 01:08 PM
Joined: Jan 2011
Posts: 3,242
PV Az
AZjeff Offline
AZjeff  Offline
Joined: Jan 2011
Posts: 3,242
PV Az
Something else to consider with your direct injection engine is the volatility of the oil. Less evaporative loss is a good thing but with DI engines it means less to gunk up the intake and valve stems. The Petroleum Quality Institute of America has lists of PCMO tests where you can look at properties of many different brands pretty easily: http://pqiamerica.com/PCMO_Sample_Summary_12_15_2016.html

You don't need a catch-can or worry about oil volatility...but this is BITOG.. every incremental little bit is mandatory.


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Re: What is a catch can? [Re: chiefsfan1] #4569166
11/09/17 06:42 PM
11/09/17 06:42 PM
Joined: Apr 2014
Posts: 611
WV
loneryder Offline
loneryder  Offline
Joined: Apr 2014
Posts: 611
WV
You also need to prevent them from freezing up in cold weather as there is a lot of moisture in that vapor.

Re: What is a catch can? [Re: loneryder] #4569301
11/09/17 09:06 PM
11/09/17 09:06 PM
Joined: Mar 2016
Posts: 1,627
Western S.C.
CR94 Online content
CR94  Online Content
Joined: Mar 2016
Posts: 1,627
Western S.C.
Originally Posted By: loneryder
You also need to prevent them from freezing up in cold weather as there is a lot of moisture in that vapor.
You might not want them filling up with water, either.


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