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Old 07-18-2011, 04:11 AM   #1
Koston740
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Default catch can contents

emptied my catch can a few hours ago ... what I found inside was a thin oily black substance that smelled of fuel. I am running an experimental vent tube from the block from under the intake manifold to vent off some excessive blowby. This is about three weeks worth. plus a 7 or 8 hour trip last week.

I dont really know if this is normal bad or good for this kind of catch can setup.


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Old 07-18-2011, 04:13 AM   #2
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Not much oil, it seemed pretty thin ...

Big thanks to everyone! I appreciate any answers/comments.
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Old 07-18-2011, 04:20 AM   #3
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i dunno if that's a lot or a little...looks like a lot to me.

Does your catch vent to atmosphere or recirculate?
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Old 07-18-2011, 04:37 AM   #4
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recirculate, so i have negative pressure, keep in mind that there is no baffel system or anything to prevent oil from flying from the hole on the block of place under the intake,

I dont see why its so black, just did an oil change not tooo long ago.

Like I said its watery and smells like fuel, if that means anything.
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Old 07-18-2011, 04:38 AM   #5
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recirculate, so i have negative pressure, keep in mind that there is no baffel system or anything to prevent oil from flying from the hole on the block of place under the intake,

I dont see why its so black, just did an oil change not tooo long ago.

Like I said its watery and smells like fuel, if that means anything.
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Old 07-18-2011, 06:32 AM   #6
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If cylinder seal is relatively good (not much blow-by) and your system for trapping oil BEFORE the can is good, then your catch can is going to capture primarily condensate that gets boiled off. It appears as a thin black fluid that smells of hydrocarbons. You won't capture as much in the summer as you will in the winter. Sounds like yours is working just fine to me.
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Old 07-18-2011, 06:32 AM   #7
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double post

Last edited by M.H. Yount; 07-18-2011 at 04:12 PM..
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Old 07-18-2011, 08:28 AM   #8
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That's still a fair amount of oil content. Oil & water don't mix, so you would see water with oil layer on top if it were just condensate



As pointed out, this particular content is seen primarily in colder weather.

As long as you're checking it frequently enough, there's no reason it should be an issue, although a baffled setup is obviously preferable in terms of keeping more of the oil in the motor.
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Old 07-18-2011, 08:28 AM   #9
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That's still a fair amount of oil content. Oil & water don't mix, so you would see water with oil layer on top if it were just condensate



As pointed out, this particular content is seen primarily in colder weather.

As long as you're checking it frequently enough, there's no reason it should be an issue, although a baffled setup is obviously preferable in terms of keeping more of the oil in the motor.
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Old 07-18-2011, 04:15 PM   #10
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What is with the TB system and all the double posts? I know I'm only hitting the button once....

If you gently pour some oil and water together - yes, you get a delineation of water on the bottom and oil on top. But the way condensate and hydrocarbons of various sorts get 'mixed' in the crankcase (pretty violent environment) it's like putting everything in a 300HP blender. So what starts as condensed water in the crankcase ends up looking like a thin dark fluid that smells like hydrocarbons.
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Old 07-18-2011, 06:10 PM   #11
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Yeah, that's a lot more oil than I see in mine too.
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Old 07-18-2011, 06:15 PM   #12
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OT question, ive been running a catch can for about a month now and there isn't even a layer of oil on the bottom, just a hazing of oil on the inside. Is something wrong with that? Btw it vents to the atmosphere!
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Old 07-18-2011, 10:25 PM   #13
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Quote:
Originally Posted by M.H. Yount View Post
What is with the TB system and all the double posts? I know I'm only hitting the button once....

If you gently pour some oil and water together - yes, you get a delineation of water on the bottom and oil on top. But the way condensate and hydrocarbons of various sorts get 'mixed' in the crankcase (pretty violent environment) it's like putting everything in a 300HP blender. So what starts as condensed water in the crankcase ends up looking like a thin dark fluid that smells like hydrocarbons.
They separate again in the catch can. I guess I should have said oil & water don't stay mixed. That's what my photo is of. His is more oil, less water.

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Old 07-18-2011, 10:29 PM   #14
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Quote:
Originally Posted by cookiemonster View Post
OT question, ive been running a catch can for about a month now and there isn't even a layer of oil on the bottom, just a hazing of oil on the inside. Is something wrong with that? Btw it vents to the atmosphere!
Where does your vent tube terminate? Where are you venting? Is there oil spray evident after it terminates? No reason to see any oil accumulation if the system is doing it's job. You won't see condensate until the weather changes.
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Old 07-18-2011, 10:52 PM   #15
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jake, keep in mind my system is venting directly from the block. that's why it fills generally quick.
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Old 10-24-2011, 12:26 AM   #16
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It sounds like your system would collect a lot of oil/fuel due to it's installation on the bottom of the plenum. (assuming this is what you mean)

3 weeks.... if you're driving 3-5k in 3 weeks that is fine, if you're driving 200 miles in 3 weeks that's bad...
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Old 10-24-2011, 12:37 AM   #17
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looks to be sucking oil out of the engine. probably need a better oil separator prior to the catch can
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Old 10-24-2011, 01:43 AM   #18
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I may just remove the extra vent tube all together. after installing it oil still seeps out of the oil cap and cam seal. But i'm sure it does provide some extra ventilation so its not really that much of an inconvenience.

Towermt I thought about using one of those water oil separation used on air compressors. But the oil seems to be staying in the can and not really causing any issues or anything. What are you using?
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Old 10-24-2011, 01:46 AM   #19
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Quote:
Originally Posted by cookiemonster View Post
OT question, ive been running a catch can for about a month now and there isn't even a layer of oil on the bottom, just a hazing of oil on the inside. Is something wrong with that? Btw it vents to the atmosphere!
try running a tube from the can back to intake after the AMM, You still need positive crankcase ventilation with a catch can, it might catch more oil then.
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Old 10-24-2011, 09:32 AM   #20
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How's your oil pressure? Could be your oil is getting contaminated by fuel (either running rich, or bad rings or valve guides). When my B21FT was in its final days the oil would go black and smell like fuel, and hot pressure would go from 4bar to ~2 after only a few days.
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Old 10-24-2011, 10:13 AM   #21
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Probably some blowby giving the fuel smell.

I run a hose off the breather box into a catch can. Can is vented to atmosphere, no hose to the pre-turbo hose. I get plenty of oil in the can because of blowby. If I pulled vacuum on the can, I'd have even more oil in there.
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Old 10-24-2011, 05:01 PM   #22
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Post some pics. I want to know exactly what you have done to vent it.
I also have though of other ways to vent the crankcase instead of the fire trap mess.
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Old 10-24-2011, 05:06 PM   #23
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bought a catch can with a filter on the top...done

http://www.pbase.com/towerymt/image/111755776.jpg

one hose connects to the breather box on the block, another connects to the b18 oil cap. can is baffled.
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Old 10-24-2011, 08:08 PM   #24
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Quote:
Originally Posted by koston240life View Post
I may just remove the extra vent tube all together. after installing it oil still seeps out of the oil cap and cam seal. But i'm sure it does provide some extra ventilation so its not really that much of an inconvenience.

Towermt I thought about using one of those water oil separation used on air compressors. But the oil seems to be staying in the can and not really causing any issues or anything. What are you using?
I've got one of those A/C catches jbwelded shut. It works well and is only 20 bucks. So long as you put something in it to allow the vapor to settle out, anything you run will be fine.
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Old 10-25-2011, 01:23 AM   #25
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Quote:
Originally Posted by towerymt View Post
bought a catch can with a filter on the top...done

http://www.pbase.com/towerymt/image/111755776.jpg

one hose connects to the breather box on the block, another connects to the b18 oil cap. can is baffled.

Does this eliminate the need for the flame trap.
I cleaned my throttle body/intake manifold last weekend and it was full of oil vapor sludge from the crankcase.
I basically want to remove everything from the engine that I don't really need. I'm not worried about emissions.
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