DIY Oil Separator/Catch Can
01-25-2009, 01:49 PM
#31
Inventor
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Tony,
I removed the PCV valve, and capped both cam cover ports. I reused the original aluminum baffle (using silicone to glue it back on).
When I get around to changing the cam cover gaskets, I will probably do as Keith/928ntslow did, and move the front 1-4 breather port over to the rear of the 5-8 cover, and run a hose between them, but I would add a T in the middle, for a third breather point. If I was using a vapor extractor, I'd connect the T to the airbox for an inlet.
Louie thinks, and I agree, that the cam cover ports should really only be for inlet air, with all the vapors being extracted at the oil fill opening. (I only recall one person using a real vacuum pump, so far.) I tried using the stock airpump output, run through a crude air amplifier, to pull a small vacuum in the crank. I plan to try this again sometime, with a better(?) design, but using it to pull air through the engine, not trying to pull a vacuum.
thread
I removed the PCV valve, and capped both cam cover ports. I reused the original aluminum baffle (using silicone to glue it back on).
When I get around to changing the cam cover gaskets, I will probably do as Keith/928ntslow did, and move the front 1-4 breather port over to the rear of the 5-8 cover, and run a hose between them, but I would add a T in the middle, for a third breather point. If I was using a vapor extractor, I'd connect the T to the airbox for an inlet.
Louie thinks, and I agree, that the cam cover ports should really only be for inlet air, with all the vapors being extracted at the oil fill opening. (I only recall one person using a real vacuum pump, so far.) I tried using the stock airpump output, run through a crude air amplifier, to pull a small vacuum in the crank. I plan to try this again sometime, with a better(?) design, but using it to pull air through the engine, not trying to pull a vacuum.
thread
01-25-2009, 03:43 PM
#32
Rennlist Member
Here's how I approached this and this is a partial repost from the twinscrew thread.
This setup has proved itself at over a dozen track days this year.
To start is the oil baffle, you will need build a basic baffle under the crankcover as a starting point. The small 3/8 inch line does not provide enough sizing to reduce the crankcase pressure. I have sized the crank cover to accept a 1 inch inside diameter hose.
One other issue was oil filling with the SC setup. I found a nice looking oil filler neck and grafted it to the driver side valve cover. I am pulling fresh air into this side of the motor in an effort to flush out the contaminants. There is a 0 cracking pressure check valve in place with a pickup filter in the high pressure area below the windshield.
I ran the discharge line from the Provent into a catch can in the driver side fender well just to be safe ...but after two full track days there was not a single drop of oil.....so I have now placed the discharge line into the low pressure area under the car in order (with a v shaped cut on the end) to provide additional vacuum draw through the Provent. The oil in the Provent is routed to the oil pan via a T in the dip stick.
So to summarize I am pulling crank case ventilation from a 1 inch line at the crank cover plus the 2-3/8 lines from the passenger side. I am bringing fresh air into the drivers side via the oil fill. With 10 PSI boost for very long sustained periods of time, I have no oil in the intake, no smoke and no oil in the to atmosphere line.
This setup has proved itself at over a dozen track days this year.
To start is the oil baffle, you will need build a basic baffle under the crankcover as a starting point. The small 3/8 inch line does not provide enough sizing to reduce the crankcase pressure. I have sized the crank cover to accept a 1 inch inside diameter hose.
One other issue was oil filling with the SC setup. I found a nice looking oil filler neck and grafted it to the driver side valve cover. I am pulling fresh air into this side of the motor in an effort to flush out the contaminants. There is a 0 cracking pressure check valve in place with a pickup filter in the high pressure area below the windshield.
I ran the discharge line from the Provent into a catch can in the driver side fender well just to be safe ...but after two full track days there was not a single drop of oil.....so I have now placed the discharge line into the low pressure area under the car in order (with a v shaped cut on the end) to provide additional vacuum draw through the Provent. The oil in the Provent is routed to the oil pan via a T in the dip stick.
So to summarize I am pulling crank case ventilation from a 1 inch line at the crank cover plus the 2-3/8 lines from the passenger side. I am bringing fresh air into the drivers side via the oil fill. With 10 PSI boost for very long sustained periods of time, I have no oil in the intake, no smoke and no oil in the to atmosphere line.
01-25-2009, 05:23 PM
#33
Race Director
great post......so heres a question...for all pre GTS 928's it seems the 1st step is to upgrade to the GTS breather.....does anyone sell a kit? Or do I need source the parts individually?
01-25-2009, 05:56 PM
#34
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.... BUT I feel the ProVent setup is much more efffective, easier and less labor to install, and definitely cheaper.
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01-25-2009, 07:27 PM
#35
Race Director
We've had one for many years https://www.928gt.com/pc-25979-1403-...for-87-92.aspx
.... BUT I feel the ProVent setup is much more efffective, easier and less labor to install, and definitely cheaper.
.... BUT I feel the ProVent setup is much more efffective, easier and less labor to install, and definitely cheaper.
Great reply!!! Since my track shark is burning-loosing 1/4 quart per 20 minute run session, I need to find a better system.....but I haven't seen any white smoke out the exhaust and nobody said anything to me about it?
