Catch Can plumbing question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

PAUL SS · 01-01-2012, 04:55 PM

See the hose that runs from the passenger side valve cover to the intake tube just in front of the throttle body?

Could that or should that be also run through the catch can? It seems to me that this hose will be sucking oil mist and dropping right into the airflow and into the intake. Is it possible to do this and would it reduce oil in the intake?

bowtie98607 · 01-01-2012, 05:18 PM

If you have the optional breather. Then that hose is blocked off.

PAUL SS · 01-01-2012, 09:27 PM

Quote:

Originally Posted by bowtie98607

If you have the optional breather. Then that hose is blocked off.

I wasn't planning on using an optional breather.

KEEP RT · 01-01-2012, 09:31 PM

It's the looped hose down low behind your throttle body control about 4" long if it were straight. I'm assuming it is on the lS3. Check the DIY section. packed with photos.

PAUL SS · 01-01-2012, 09:36 PM

Quote:

Originally Posted by KEEP RT

It's the looped hose down low behind your throttle body control about 4" long if it were straight. I'm assuming it is on the lS3. Check the DIY section. packed with photos.

Yes, that is where you connect your catch can but I think there is possibly more oil being ingested through the valve cover line that connects to the air tube.

13 ZL1 · 01-01-2012, 09:47 PM

That line is not connected to the catch can. That hose is to allow air in. If you want to prevent oil going into the intake from this line then you need to add the breather. The catch can is put in the line that goes from the valley cover to the intake on the LS3. It is behind and below the hose you have outlined. The hose is U shaped and about 4 inches long and has quick disconnects on it. You should check out SC2150's threads.

PAUL SS · 01-02-2012, 09:01 AM

Quote:

Originally Posted by Orange2SSRS

That line is not connected to the catch can. That hose is to allow air in. If you want to prevent oil going into the intake from this line then you need to add the breather. The catch can is put in the line that goes from the valley cover to the intake on the LS3. It is behind and below the hose you have outlined. The hose is U shaped and about 4 inches long and has quick disconnects on it. You should check out SC2150's threads.

I understand that line is not connected to the catch can and I do know which lines are. My question is should that line also be connected to the can?

The end of that hose is at the front of the throttle body which would be in a vacuum most of the time and sucking whatever is at the other end. Seeing how it is connected to a valve cover and is an oily enviroment wouldn't you think that oil would be ingested through it?

If we install a catch can to keep oil out of the intake, I want to keep all oil out.

13 ZL1 · 01-02-2012, 10:13 AM

The simple answer is no. It is possible to pull oil into the intake from this hose. The solution is to get the breather.

SC2150 · 01-02-2012, 12:47 PM

Orange is correct.

Proper crankcase evacuation requires not only a evacuation oute and the suction to allow it, but allso there must be a filtered fresh make up air source and that is what that line is. The problem is at WOT there will be some oil ingestion through reversion or back-flow when there is almost no intake manifold vacuum present so the crankcase pressure wants to go somewhere. If you use a standar open breather then you introduce excess unmetered air to the system and your tune goes crazy as the ECU tries to compensate, so the RX breather kit has a flow controlling valve in it calibrated for the size of the motor & the application.

If your car is not driven hard, then the breather may not be a must like it is on a big build or FI application. To see if it does, simply remove that tube and feel for any oil residue between the inlet fitting and the throttle body. If you have oil, the breather will eliminate it.

Thanks Orange for the tech help!

PAUL SS · 01-02-2012, 01:05 PM

Thanks everybody

IndeedSS1 · 01-02-2012, 04:10 PM

Quote:

Originally Posted by PAUL SS

Thanks everybody

I have 28k miles on my car and have never seen oil in that hose.

SC2150 · 01-02-2012, 04:13 PM

You have a good sealed motor then. No need for a breather kit if your not getting oil in the front of the TB.

IndeedSS1 · 01-02-2012, 04:19 PM

Quote:

Originally Posted by SC2150

You have a good sealed motor then. No need for a breather kit if your not getting oil in the front of the TB.

It sure was having a lot of oil being caught in the catch can on the dirty side though.

It may only be half well-sealed.

13 ZL1 · 01-02-2012, 04:58 PM

Quote:

Originally Posted by IndeedSS1

It sure was having a lot of oil being caught in the catch can on the dirty side though.

It may only be half well-sealed.

Indeed, I remember a while back you had a filter inline with the output of your catch can. Can you send me a link to that thread?

01-01-2012, 04:55 PM	#1
PAUL SS The Mark of Excellence Drives: 2010 ABM 1SS RS LS3 Join Date: Jan 2009 Location: Smallest State in the Union Posts: 8,690 View My Garage	Catch Can plumbing question See the hose that runs from the passenger side valve cover to the intake tube just in front of the throttle body? Could that or should that be also run through the catch can? It seems to me that this hose will be sucking oil mist and dropping right into the airflow and into the intake. Is it possible to do this and would it reduce oil in the intake? __________________ BMR, CAI, DynoMax, Elite Eng., Hurst, Jannetty, Clear Image Headers & Hi Flow cats, Jet Hot, LSR, TSW, VMax, Vredestein

01-01-2012, 05:18 PM	#2
bowtie98607 Drives: 12 SS2RS, 73 RS/TypeLT, 68 Vette Join Date: Nov 2011 Location: Vancouver, Washington Posts: 222 View My Garage	If you have the optional breather. Then that hose is blocked off. __________________

01-01-2012, 09:31 PM	#4
KEEP RT Wonderfully Awful Idea Drives: 2010 2SS/RS Join Date: Aug 2010 Location: Battle Ground, WA Posts: 1,456 View My Garage	It's the looped hose down low behind your throttle body control about 4" long if it were straight. I'm assuming it is on the lS3. Check the DIY section. packed with photos. __________________

01-02-2012, 01:05 PM	#10
PAUL SS The Mark of Excellence Drives: 2010 ABM 1SS RS LS3 Join Date: Jan 2009 Location: Smallest State in the Union Posts: 8,690 View My Garage	Thanks everybody __________________ BMR, CAI, DynoMax, Elite Eng., Hurst, Jannetty, Clear Image Headers & Hi Flow cats, Jet Hot, LSR, TSW, VMax, Vredestein

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01-01-2012, 09:47 PM	#6
13 ZL1 Drives: 2013 IOM ZL1 Join Date: Nov 2009 Location: Manteca CA Posts: 683	That line is not connected to the catch can. That hose is to allow air in. If you want to prevent oil going into the intake from this line then you need to add the breather. The catch can is put in the line that goes from the valley cover to the intake on the LS3. It is behind and below the hose you have outlined. The hose is U shaped and about 4 inches long and has quick disconnects on it. You should check out SC2150's threads.

01-02-2012, 10:13 AM	#8
13 ZL1 Drives: 2013 IOM ZL1 Join Date: Nov 2009 Location: Manteca CA Posts: 683	The simple answer is no. It is possible to pull oil into the intake from this hose. The solution is to get the breather.

01-02-2012, 12:47 PM	#9
SC2150 Account Suspended Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009 Location: Bradenton, FL Posts: 6,063	Orange is correct. Proper crankcase evacuation requires not only a evacuation oute and the suction to allow it, but allso there must be a filtered fresh make up air source and that is what that line is. The problem is at WOT there will be some oil ingestion through reversion or back-flow when there is almost no intake manifold vacuum present so the crankcase pressure wants to go somewhere. If you use a standar open breather then you introduce excess unmetered air to the system and your tune goes crazy as the ECU tries to compensate, so the RX breather kit has a flow controlling valve in it calibrated for the size of the motor & the application. If your car is not driven hard, then the breather may not be a must like it is on a big build or FI application. To see if it does, simply remove that tube and feel for any oil residue between the inlet fitting and the throttle body. If you have oil, the breather will eliminate it. Thanks Orange for the tech help!

01-02-2012, 04:13 PM	#12
SC2150 Account Suspended Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009 Location: Bradenton, FL Posts: 6,063	You have a good sealed motor then. No need for a breather kit if your not getting oil in the front of the TB.