New Aluminum Catch Can
02-14-2004, 11:31 PM
#47
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<<<It should always be below the oil level.>>>
In an open, vacuum-less system there is no need for the return line to be below the oil level... Am I missing something?
In an open, vacuum-less system there is no need for the return line to be below the oil level... Am I missing something?
02-14-2004, 11:39 PM
#48
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Originally posted by cpt_koolbeenz
<<<It should always be below the oil level.>>>
In an open, vacuum-less system there is no need for the return line to be below the oil level... Am I missing something?
<<<It should always be below the oil level.>>>
In an open, vacuum-less system there is no need for the return line to be below the oil level... Am I missing something?
With the drain above the oil level then oil will blow into the catch can thru both lines and only be a part time drain.
IMHO
02-15-2004, 03:21 AM
#49
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David's got it right, this "drain" in the past couple posts here is when the condensed oil from the catch can is plumbed back into the oil pan. IF it is NOT then the open pepcock/valve can be placed at any height, however the hose running to the catch can should always be running "down" from the factory air/oil sep. AND there should be no dips in the hose (oil can gather there and block the traveling air/oil vapor), so using the right amount as far as length is concerned is important.
Hope this helps, take care everyone!
BTW I am in the market for a catch can as well, so I will have to see how many are left when cpt_koolbeenz gets back.
Hope this helps, take care everyone!
BTW I am in the market for a catch can as well, so I will have to see how many are left when cpt_koolbeenz gets back.
02-15-2004, 03:26 AM
#50
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<<<With the drain below oil level, the oil will blow into the catch can thur the oil/air separator and will be a constant drain into the oil pan.
With the drain above the oil level then oil will blow into the catch can thru both lines and only be a part time drain.>>>
I understand what both of you (Tony and David) are saying... The only reason I mentioned the return can go above oil level in an OPEN system is because I have witnessed it first hand. After thinking about it for a while, I don't think the latter condition will happen - the air will take the path of least resistance (out the 3/8 line in this case). When the return line has a bit of oil in it, the air will escape out the larger line even more.
However, I don't think you would even need to return the oil above the oil level anyway in our cars... But if you needed to, I don't think you would have a problem with it (based off first hand experience).
Having said that, if I do run a return line, mine will run under the oil level...
With the drain above the oil level then oil will blow into the catch can thru both lines and only be a part time drain.>>>
I understand what both of you (Tony and David) are saying... The only reason I mentioned the return can go above oil level in an OPEN system is because I have witnessed it first hand. After thinking about it for a while, I don't think the latter condition will happen - the air will take the path of least resistance (out the 3/8 line in this case). When the return line has a bit of oil in it, the air will escape out the larger line even more.
However, I don't think you would even need to return the oil above the oil level anyway in our cars... But if you needed to, I don't think you would have a problem with it (based off first hand experience).
Having said that, if I do run a return line, mine will run under the oil level...
02-15-2004, 03:35 AM
#52
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You must have the drain below the oil level line no mater the configuration (obviously assuming that you are draining back to the oil pan) or you will have crank case pressure, equal to the amount of boost being run, blowing up the drain, into the catch can.
And the possibility exists, and is very probable, that oil will be blown back up into the catch can as well since the engine oil is always moving around (acceleration, braking, cornering).
This would be a big problem.
Also, the line from the factory seperator does NOT have to be running down to the aftermarket catch can. There is zero benefit to doing this. However, if the line runs up to the aftermarket catch can, less oil will be collected in the aftermarket catch can (good because the oil that has collected on the walls of the line will run back to the factory seperator (which it should).
Porsche had a very good reasion for having the turbo oil drain plumbed into the lowest possible position in the oil pan. This was not an accident.
Follow the same logic.
TonyG
And the possibility exists, and is very probable, that oil will be blown back up into the catch can as well since the engine oil is always moving around (acceleration, braking, cornering).
This would be a big problem.
Also, the line from the factory seperator does NOT have to be running down to the aftermarket catch can. There is zero benefit to doing this. However, if the line runs up to the aftermarket catch can, less oil will be collected in the aftermarket catch can (good because the oil that has collected on the walls of the line will run back to the factory seperator (which it should).
Porsche had a very good reasion for having the turbo oil drain plumbed into the lowest possible position in the oil pan. This was not an accident.
Follow the same logic.
TonyG
02-15-2004, 03:42 AM
#53
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>>>In an open, vacuum-less system there is no need for the return line to be below the oil level... Am I missing something?<<<
There is no "vacuum-less system" here. However, there is a system that has a lot of positive pressure (the crank case). The term vacuum-less is very much misleading and not the correct term. It's a positive pressure situation when on boost, and a vacuum situation when off boost.
You set the drain above the oil level, and you will have all of the crank case pressure blowing up the drain, into the catch can. It should be obvious that crank case pressure will find the path of least resistance.... and a drain pipe going up into a catch can offers very little (if any) resistance.
TonyG
There is no "vacuum-less system" here. However, there is a system that has a lot of positive pressure (the crank case). The term vacuum-less is very much misleading and not the correct term. It's a positive pressure situation when on boost, and a vacuum situation when off boost.
You set the drain above the oil level, and you will have all of the crank case pressure blowing up the drain, into the catch can. It should be obvious that crank case pressure will find the path of least resistance.... and a drain pipe going up into a catch can offers very little (if any) resistance.
TonyG
02-15-2004, 03:51 AM
#54
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<<<There is no "vacuum-less system" here. However, there is a system that has a lot of positive pressure (the crank case). The term vacuum-less is very much misleading and not the correct term. It's a positive pressure situation when on boost, and a vacuum situation when off boost.>>>
How is it a vacuum situation when off boost? It is OPEN (hence the filter) to the atmosphere! If anything it still should be positive pressure since there is always blowby...
How is it a vacuum situation when off boost? It is OPEN (hence the filter) to the atmosphere! If anything it still should be positive pressure since there is always blowby...
02-16-2004, 01:32 AM
#55
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well ill be interested.how much does it cost plus shipping to hawaii.also im still running the stock afm,i want to mount it where my passenger headlight used to be(im running a vented panel without headllights).thanx
