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jdinnerOffline
Post subject: BMW V12 Oil in Intake (Catch Can)  PostPosted: Aug 11, 2015 - 02:34 AM
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Joined: Nov 10, 2003
Posts: 3076
Location: Toronto, Ontario, Canada
Status: Offline
Catch Can
My Video:
https://www.youtube.com/watch?v=qQrdtlTJU50

Problem:
Engine runs great and no issues with performance. However, when it is idling at traffic lights I see slight blue smoke from the tail pipes. When I accelerate from the lights I get a cloud of blue smoke (oil burning) and then it does not reappear while driving normally.
The condition is worse when I decelerate while leaving the transmission in gear, (engine braking).
When one uses the engine to brake with a manual transmission the intake manifold vacuum is greater than normal. Both throttle blades are closed and the engine is being forced to spin faster than normal. This higher than normal vacuum, I believe, is drawing excessive amounts of oil mist from the crankcase into the air intake system through the BMW PCV valve, (volume control valve - VCV). These valves are a two stage vacuum valve and that makes them much different than a normal PCV valve.
In either case the oil (I believe) is being sucked in and burned whenever the vacuum is great.

Possible Solution:
I made two vacuum chambers that will be mounted about 24” away from the PCV valves. These chambers will have an ‘in’ and an ‘out’ port. The ‘in’ port will be connected to the PCV valve in the rocker cover. The oil mist will travel in a tube to the homemade chamber. This ‘in’ port has a tube connected on the inside of the chamber to force the oil mist to the bottom of the chamber to be filtered and trapped in some steel wool. The ‘out’ port is located at the top side of the chamber and should allow for only clean air to be sucked into the intake manifold.
On the bottom of these chambers I drilled and threaded in drain ports so the oil sludge can be removed periodically. These also can be removed and washed with varsol if needed.

Construction:
I used 2” diameter stainless steel exhaust pipe 6” long.
I used 1/8” plate for the top and bottom plates. I made the top plate larger so it can be the mounting bracket as well.
I used 4 of 3/8”NPTx3/8” barbed x 90 degree elbows for all the vacuum ports.
I used 3/8” steel fuel line inside the chamber to direct the oil mist to the bottom.
The steel wool is from the dollar store and was $1.00.

Information:
A PCV or VCV system has a purpose. To relieve crankcase pressure and fumes. It is part of the emissions systems.
Most engines have an air inlet for the crankcase connected to the air filter side of the intake system before the throttle plate. This air enters the crankcase through a port in the rocker cover. The air/fumes are sucked out of the crankcase by way of the PCV valve in a rocker cover connected to the intake manifold after the throttle plate. It is these fumes that we need to clean up to prevent oily residue collecting inside the intake manifold and burning creating blue smoke.

Videos like this are made by people that have no idea how the system works or its purpose.
For example, this guy has now prevented air from entering his crankcase.
https://www.youtube.com/watch?v=ESiPMnae0yI

This guy thinks the air inlet port to the valve cover has oil in it for some reason. He has installed it on the wrong side of the PCV system. Oddly enough he calls it Oil Catch Can Explained.
https://www.youtube.com/watch?v=E3oWXaElUWg

This guy installed one on the inlet side as well. Very strange, I have no idea why anyone thinks there is oil in the air we breathe.
https://www.youtube.com/watch?v=rd0kS4YK-sE

One more guy installing it the wrong way as well:
https://www.youtube.com/watch?v=gSc6g_YIO0E

This is how it is supposed to work:
https://www.youtube.com/watch?v=EPIfI9aZHt4


My Video:
https://www.youtube.com/watch?v=qQrdtlTJU50

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lambo1Offline
Post subject: BMW M70 SMOKING  PostPosted: Aug 11, 2015 - 03:49 AM
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Joined: May 14, 2005
Posts: 167

Status: Offline
Hi Jim, your post is rather timely, I was having the same issue with my m70, mine was so bad that the car was oiling up the plugs and producing large amounts of oil smoke to the point the car was disappearing in it at idle , it was also running extremely rich, eventually the plugs got so oiled up it would not start, it is still in my donor and the plan was to sort its issues before removing the engine. After many hours of head banging , I contacted and old BMW mechanic mate who said its very common for the sump to either leak or suck air, that will cause the oil to travel through the pcvs, the car did not leak any oil so I was doubtful about the sump until I jacked the car up and then the sump leaked like a sieve. I found a way of only removing the upper and lower sump without removing the autotrans or exhaust, and have replaced the sump gaskets, I was told the slightest vacuum leak in the sump will cause the problem we have.
Also have you replaced the valve seals as I have had several cars with your problem and they always smoked at idle or on overrun downhill when the vacuum is high new seals sorted that.
I still have the PCV valves out and wonder if you know if how they should work correctly if I suck on the valves that go in the rocker covers both are sealed, if I blow they allow air through the assembly, the two short pipes in the centre flow the same in both directions with no restriction either way, although there is a valve in there as far as I can see, also from what I can see these are the old black type not the white superseded model. I have just rebuilt my dk motors as one was dead and putting the ecu in limp mode I think that's why it was very rich. I also got an oil pressure check light and after draining the sump I found a small copper washer, I suspect its from the rocker banjos, is it possible for the hollow bolt to come out completely with the rocker covers on, the cams have a small amount of wear so its possible something is not right but it looks like a major intake off etc to inspect the banjos, do you have any thoughts on any of the above.
Best Regards
Graeme
 
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jdinnerOffline
Post subject: RE: BMW M70 SMOKING  PostPosted: Aug 11, 2015 - 12:05 PM
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Joined: Nov 10, 2003
Posts: 3076
Location: Toronto, Ontario, Canada
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I'm not sure if the banjo bolt will come out completely but I would suspect it for sure. It is probably dumping large amounts of oil on that camshaft and some of it is being sucked into the PCV.
If you blow into the PCV the way the arrow is pictured on it you be able to blow constant pressure. Until you give a sudden burst of air it will snap almost shut and open up the small port fully. I tested three of them with an air line and they all acted the same after washing them out. I also found out that BMW doesn't carry the PCV's anymore and they need to come from Germany.

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andpgudOffline
Post subject:   PostPosted: Oct 05, 2015 - 10:43 PM
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Joined: Nov 30, 2011
Posts: 33

Status: Offline
Hello
I have been thinking about adding 2 catch cans for my e31 CSI S70 motor.
What do you guys think?
 
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