Herman K

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When I got our 928 in 2005 with 80K on the odometer I was using 1 quart of oil per 800-1000 miles.

With time gone by and many more miles travelled (154K miles in January 2012) over time my oil consumption had increased to 1 quart per 300-400 miles.

As the car developed an idling issue (vacuum leak) in March of 2012 I needed to rebuild the intake and at the same time I looked into finding a solution to reducing my oil consumption, as various suppliers where not able to assist/supply me with any solutions at that time I took it upon myself to come up with a solution.

With the “HKR3” (as per PDF files attached) oil separator system installed in early May of this year the current odometer reading is 162K plus and since the last 3000 miles (Dallas-Phoenix-Hot Springs-Dallas) road trip the oil consumption is back in the 1 quart per 800-1000 miles range.

I expect to make one more modification when I’ll get time to install my newly powder coated intake and cam covers I intent to exchange the rear PS elbow from a 6mm – to a 11mm unit.

I’m quite happy with the results so far as we use our car a lot for long distance road trips.

For some video of our last road trip see http://youtu.be/Be7tr4UfxM8

Happy 928 motoring to all of you

Shark_Week

very nice Herman.
i'll be needing to do something about my cars oil consumption too.

andy-gts

I really liked your set up Herman and It was a pleasure meeting you at the OCIC this yr!!

andy

Lizard928

Herman, do you run an air pump? If not consider a vacuum pump. Your consumption will drop again.

Herman K

My aim has been to search all the related facts, by reading as much published information (good or bad) and come up with the least invasive solution to reduce oil ingestion/blow by and at the same time have the least amount of down time possible.

You can see from our odometers readings we enjoy having it available to drive versus it sitting in the garage.

Since I now have established a base line for our car I definitely will look into what it takes to follow your recommendation of an external vacuum pump that may further reduce oil consumption.

I appreciate your input.

the flyin' scotsman

Great work Herman.......I can add further once I get the MAF off and report results today

Herman K

My recommendations are to do some thing sooner than later to avoid piston and oil scraper rings from becoming "gunked-up" in their groves.

Andy, thanks for the kind words we enjoyed following your good looking GTS all the way to KC.


Malcolm, your information how you went from using a lot of oil and than on your long drive to OCIC going to zero oil use with the stock 92-93 breather set-up has been of great value to me to realize what happens over a longer period of time when there is oil ingestion.

I really appreciate that you're sharing experiences and provide further feed back to the community.

Lizard928

Herman,

By running an external vacuum pump on the motor you can generate vacuum in the crankcase. When you do this (max 12in Hg), it will pull the piston rings down which will aid in their sealing which will in turn help to scrape the oil off the walls and keep it in the sump and out of the combustion chamber.

Herman K

Colin,

I know you participated in some of the November 2011 RL threads on this subject.

I don't know if you're in a position to share more information about your vacuum pump set-up, if you do I would welcome that and if you don't I understand that as well.

All comments are appreciate.

Best H

Fastest928

Herman,

Very well done.....!

Cheers,
Marc

Lizard928

Herman,

Sorry I missed that post when it was made.

I'm more than happy to share any information that you want to know.

If running a porkensioner the install is very easy with a little fabrication.

Herman K

Colin

Right now I have 0 Crank case pressure in the 675-2500RPM range (I have not had the gauge on over 2500RPM) with the setup as I have now.

I do run the Porkentensioner / no air pump bracket version do I need the air pump bracket version?

Plus other questions like pump brand, pulley size etc.

PM send

Best H

Leon Speed

Herman,

I thought previously you left the drivers side oil filler neck connected to the throttle body as per original?

Herman K

I still have that hose in place but just have it capped for now to make sure I get 100% of any C-case vapors to travel to the Provent.

With a vacuum/pressure gauge attached to that port I don't get any noticeable reading as the PS (enlarged to11mm)ports opening is located before this port I have found that it handles all the flow in the 675-2500RPM range.

I'm planning to test this will driving in the 3000-6000RPM range soon

SeanR

Herman, I need yours,Joes, or Mikes expertise in making one for my car. Oil out the dip stick tube sucks.