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Unread 01-08-2015, 01:30 AM #1
IDLife MINI IDLife MINI is offline
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Cool Vacuum Pump Delete & AOS

Well I for one, love my MINI and have been fixing the issues that lead to most of the drama these cars have.

For one... I am removing the PCV system and have installed an Air/Oil separator made from easy to find parts at Home Depot. Using 1.5" PVC, two kitchen sink stainless drain screens and the high density 3M pad for a vapor collector sandwiched in the PVC pipe has proven on other turbo vehicles to be very effective. The two points on the valve cover are now connected to draw through an oil filtration point, then the breather to the turbo inlet is connected at a higher point so I can have clean crankcase air drawn in for better ring seal.

I was alerted to my failing vacuum pump by the oil dripping on the ground from the vacuum line disconnected from the rear vac reservoir. So after a LOT of searching, decided to make a block off part to remove the vacuum pump altogether. I then removed the intake manifold, bored out the fitting to 8mm and installed a check valve so the system only sees vacuum, not boost. I made a secondary vacuum reservoir which has a 13-19 hg/in sensor switch that powers a Cadillac CTS-V electric aux vacuum pump so my brakes & boost control solenoid will always have sufficient vacuum to function. I mounted the Vacuum Reservoir under the cowl panel and low enough to not hit the wiper mechanism.

So far I have spent less money to do all this than it would have taken to replace the pump alone... and I will never have to worry about it failing again! In fact... I bet I free up a few HP from not having to turn it at all!

I will have this project all wrapped up in a week when I can get more time to mess with it. Should be a great mod to share!
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Vacuum Pump Delete & AOS-vpdm-05.jpg Vacuum Pump Delete & AOS-vpdm-04.jpg Vacuum Pump Delete & AOS-vpdm-03.jpg Vacuum Pump Delete & AOS-vac-canister-aos.jpg Vacuum Pump Delete & AOS-vac-canister-mounted.jpg 
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Unread 01-08-2015, 01:32 AM #2
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Just a few more pics
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Vacuum Pump Delete & AOS-aos-05.jpg Vacuum Pump Delete & AOS-aos-02.jpg Vacuum Pump Delete & AOS-aos-04.jpg Vacuum Pump Delete & AOS-vac-pump-mount-2.jpg Vacuum Pump Delete & AOS-vac-pump-mounted.jpg 
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Unread 01-08-2015, 10:00 AM #3
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Thanks for the "How To"

I just use a compressor air/water separator from Harbor Freight. Less then $5.
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Unread 01-08-2015, 10:06 AM #4
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I wonder how that PVC piping will hold up over time. Nice work hope it turns out to be a long term solution for you.
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Unread 01-08-2015, 10:23 AM #5
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Cool

Quote:
Originally Posted by Crashton View Post
I wonder how that PVC piping will hold up over time. Nice work hope it turns out to be a long term solution for you.
For the AOS, it is simply a test to see how well it works. The passenger side fitting from the valve cover was blocked by a threaded plug, thus making it completely ineffective for drawing crankcase pressure into the intake. The second fitting from the valve cover to the turbo inlet was also full of oil, leading me to remove the intercooler to flush out nearly a half pint of oil! After days of gravity draining, I washed it out and reinstalled it.

I am planning to drop the oil pan, tap a fitting so the AOS can drain directly into the engine if I cannot find an acceptable boss or plug already in the engine not being used. This is not my first rodeo but it is my first dance with the MINI Cooper, so we shall see how well she likes it!
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Unread 01-08-2015, 10:41 AM #6
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Quote:
Originally Posted by mrntd View Post
Thanks for the "How To"

I just use a compressor air/water separator from Harbor Freight. Less then $5.
I thought of that idea, but I really did not think it would be as effective as having a larger volume to separate the oil from the air vapor at low pressures. A compressor Air/Oil separator is under pressure and usually not designed for synthetic oils. The other issue is that using the Harbor Freight versions are simply not designed for high volume, low pressure. By having a small orifice, you increase the velocity of airflow thus helping to keep the oil in vapor suspended. By reducing the pressure and velocity across the medium in the separator, you do two things... first you drop pressure which helps liquids condense. This removes water vapor from the inside of the engine that collects as climates change and the engine warms up. This reduces rust contamination and oxidation from moisture. Secondly you increase the collection of the oil in the separator due to the dropping of the pressure.

Having large .75" inlets & outlets to the AOS with multiple layers of stainless steel mesh for the oil to be caught in conjunction with the 90-degree bend at the top really will keep the oil away from my intake and ultimately away from my intercooler.

If it all works the way I like, then I will get a KRU-82 Vodka Bottle and make a REAL NICE AOS system!
Wecome to KRÜ 82 | KRÜ*82 Vodka

thoughts?

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Last edited by IDLife MINI; 01-08-2015 at 10:47 AM.
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Unread 01-08-2015, 12:57 PM #7
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If you are in the area of the country that is seeing -7F temperatures like we did today in Columbus... Be aware there will be quite a bit of crankcase water vapor that gets collected in the mesh.... Sitting outside with a cold engine at startup, you may have issues with ice blockage until the engine heats up enough to melt the plug.... and until then you will probably experience high crankcase pressures which aren't a good thing....
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Unread 01-09-2015, 01:33 AM #8
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Cool

Just an update on the progress. I finished the install of my Vacuum pump delete and AOS install. The car runs GREAT!! I cannot believe how quiet it is without the vacuum pump! The engine feels like it pulls hard, although I am sure it is just because the colder weather is helping to make more power.

Here is a link to the install overview video:

Last edited by IDLife MINI; 01-09-2015 at 07:35 AM.
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Unread 01-09-2015, 07:35 AM #9
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Unread 01-09-2015, 04:42 PM #10
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Sign up for the NASA event next weekend at MSR Houston and give it a good thrashing.
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