Oil breather catch can?

rnoswal · 01-28-2006, 03:37 PM

I just got an 87 turbo. The engine has about 60K on it. I remember a thread that mentioned something about oil pooling up in the air system. I saw a solution in a thread that had a nice catch resevoire from JAZ, but I was wondering if this is a must, or not necessary.

The reason I ask is because the piping is clean right now because most of it had to be replaced, but will this be a problem that needs a fix? I realize the breather system currently vents the oil vapors back through the intake and can cause a nice carbon build up, but what about this pooling of oil in the intake piping system? The turbo has recently been gasket refreshed and the engine sounds pretty solid.

What if any fixes in this area are needed and if a fix is needed, just what are the ways of doing this from others of you that have a turbo model?

Thanks

Russ

Bullz_EyE · 01-28-2006, 05:02 PM

Ya, I posted up the JAZ can based on a recommendation from an independent web site. But there are many owners who incorporate an oil catch can in their engine. The JAZ can is relatively inexpensive and it's small too, plus it has a breather, necessary to function properly. A lot of catch cans on the market do not incorporate a breather, although you can incorporate one yourself.

The one pint mini breather is just a little scroll down.
http://www.jazproducts.com/index2.htm

rnoswal · 01-29-2006, 03:47 AM

I saw that thread and the product looks nice. The way it was mounted in the car looked good too. I was just wondering why it was necessary. Why is there a pooling of oil and is this normal with turbocharged cars? Or is it a by-product of an engine that is wearing out, ring blowby, etc. Or is it the case of the positive pressure possibly causing the oil to be forced out of the engine through the breather system?

Thanks

Russ

Bullz_EyE · 01-29-2006, 05:11 PM

It's a combination of the things you mentioned. You're on the right track.

Burn N' Up · 01-30-2006, 07:27 PM

Oil pools in the IC piping because of the PCV hoses. Climb aboard the Magic Supra School bus and away we go to your MK3 Turbos engine compartment....

Look at your intake(accordian) tube it has three hoses coming off of it, one of which is the main concern of our topic. The one that is most centerline of the others leads to the Positive Crankcase Ventilation hoses, these are the two hoses that come off the top of the head and connect to the pipe just to the rear of the 3000 pipe. These hoses suck oily vapors from the crank case up and into your intake manifold for reburn, thank you very much EPA. but coincidently they also suck vapors into your intake manifold =O =( This way there is always vacuum pulling on these hoses either from intake tube or from the throttle body because the PCV hoses connect to the throttle body past the throttle butterfly valve. But here is where the =( comes from. Go to the intake tube that you now know is sucking HOT OILY vapors into your turbo charger who happily mixes it with the charge air making it even hotter from compression (see Boyle's Law) it heads down your IC piping and once reaching the IC it gets cold, and thus condenses turning those oily vapors into sludge stuck to the inside of your IC and all post IC intake pipping. So, is this a usual problem in turbo cars? As long as the EPA has something to say about PCV, yes it will be.

The Breather Can basically takes these vapors and lets them cool off inside it dumping the oil there... instead of in your IC. Not sure if you need to hook the PCV hoses back up for smog or not.... Just hook both sides of the PCV tube (the one behind the 3000 pipe) to the can and voila.

Edit: It does create a small air leak that wasn't there before that the car will adjust to. So don't worry about that little bit of rough idle you get initially. I forget ho many drive miles or minutes it takes to get reprogrammed but 30 minutes is not uncommon.

rnoswal · 01-31-2006, 02:43 PM

Great explanation! I like the part from JAZ and will probably go that route. It almost sounds like a necessity. I can hardly wait to drive it. I just need to get my 87 N/A ready for sale, then by this weekend.......... :- ).

Thanks

Russ

01-28-2006, 03:37 PM	#1
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	Oil breather catch can? I just got an 87 turbo. The engine has about 60K on it. I remember a thread that mentioned something about oil pooling up in the air system. I saw a solution in a thread that had a nice catch resevoire from JAZ, but I was wondering if this is a must, or not necessary. The reason I ask is because the piping is clean right now because most of it had to be replaced, but will this be a problem that needs a fix? I realize the breather system currently vents the oil vapors back through the intake and can cause a nice carbon build up, but what about this pooling of oil in the intake piping system? The turbo has recently been gasket refreshed and the engine sounds pretty solid. What if any fixes in this area are needed and if a fix is needed, just what are the ways of doing this from others of you that have a turbo model? Thanks Russ

01-28-2006, 05:02 PM	#2
Bullz_EyE 3" Exhaust Join Date: Oct 2005 Location: San Diego, CA Posts: 238	Ya, I posted up the JAZ can based on a recommendation from an independent web site. But there are many owners who incorporate an oil catch can in their engine. The JAZ can is relatively inexpensive and it's small too, plus it has a breather, necessary to function properly. A lot of catch cans on the market do not incorporate a breather, although you can incorporate one yourself. The one pint mini breather is just a little scroll down. http://www.jazproducts.com/index2.htm __________________ Function Over Form - Form Follows Function 88 MkIII Jurbo

01-29-2006, 05:11 PM	#4
Bullz_EyE 3" Exhaust Join Date: Oct 2005 Location: San Diego, CA Posts: 238	It's a combination of the things you mentioned. You're on the right track. __________________ Function Over Form - Form Follows Function 88 MkIII Jurbo

01-30-2006, 07:27 PM	#5
Burn N' Up 3" Exhaust Join Date: Sep 2005 Posts: 238	Oil pools in the IC piping because of the PCV hoses. Climb aboard the Magic Supra School bus and away we go to your MK3 Turbos engine compartment.... Look at your intake(accordian) tube it has three hoses coming off of it, one of which is the main concern of our topic. The one that is most centerline of the others leads to the Positive Crankcase Ventilation hoses, these are the two hoses that come off the top of the head and connect to the pipe just to the rear of the 3000 pipe. These hoses suck oily vapors from the crank case up and into your intake manifold for reburn, thank you very much EPA. but coincidently they also suck vapors into your intake manifold =O =( This way there is always vacuum pulling on these hoses either from intake tube or from the throttle body because the PCV hoses connect to the throttle body past the throttle butterfly valve. But here is where the =( comes from. Go to the intake tube that you now know is sucking HOT OILY vapors into your turbo charger who happily mixes it with the charge air making it even hotter from compression (see Boyle's Law) it heads down your IC piping and once reaching the IC it gets cold, and thus condenses turning those oily vapors into sludge stuck to the inside of your IC and all post IC intake pipping. So, is this a usual problem in turbo cars? As long as the EPA has something to say about PCV, yes it will be. The Breather Can basically takes these vapors and lets them cool off inside it dumping the oil there... instead of in your IC. Not sure if you need to hook the PCV hoses back up for smog or not.... Just hook both sides of the PCV tube (the one behind the 3000 pipe) to the can and voila. Edit: It does create a small air leak that wasn't there before that the car will adjust to. So don't worry about that little bit of rough idle you get initially. I forget ho many drive miles or minutes it takes to get reprogrammed but 30 minutes is not uncommon. Last edited by Burn N' Up; 01-30-2006 at 07:30 PM.

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01-29-2006, 03:47 AM	#3
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	I saw that thread and the product looks nice. The way it was mounted in the car looked good too. I was just wondering why it was necessary. Why is there a pooling of oil and is this normal with turbocharged cars? Or is it a by-product of an engine that is wearing out, ring blowby, etc. Or is it the case of the positive pressure possibly causing the oil to be forced out of the engine through the breather system? Thanks Russ

01-31-2006, 02:43 PM	#6
rnoswal Lexus & 550's Join Date: Apr 2005 Location: Bossier City LA Posts: 556	Great explanation! I like the part from JAZ and will probably go that route. It almost sounds like a necessity. I can hardly wait to drive it. I just need to get my 87 N/A ready for sale, then by this weekend.......... :- ). Thanks Russ