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A Dirty Job Made Easy

John Ammeter, Seattle, WA
Puget Sound RVators

What is your least favourite job?  No, I don’t mean mowing the lawn; what part of aircraft maintenance is the least favourite yet can be the most important job you can do?

We all hate to change the oil in our engines, yet it must be done.  What if I told  you that changing the oil filter would not spill a drop of oil, the filter would screen out particles as small as 3 microns, and you wouldn’t need to buy any more filters?  Not only that but the oil filter will help cool your engine,  and there is a warning light to be installed on your panel that will warn you of possible engine problems or that your filter needs to be cleaned.

You may already have guessed that I am speaking of the ADC-Oberg filter. One of our local RV-6 flyers has been using this filter on his aircraft for some time now.  He is totally satisfied with it and since his engine has over 2100 hours on it he is checking it every 25 hours for any contamination of metal particles.

This filter has been used in high performance and racing circles for over 10 years.  The University of Utah tested it against the best spin-on filters on the market and not only did it filter out particles that the spin-on filters missed but it also filtered out fibres which were part of the filter medium of the spin-on filter.  The filter will clean 100% of the oil 100% of the time until the screen is contaminated; at this time the filter by-pass will open and a panel mounted caution light will come on to alert the pilot that the screen should be cleaned at the next convenient opportunity.

The Puget Sound RVators have contacted the Aviation Development Corporation about a discount for our RV builder/flyers.  The list price of the ADC-Oberg filter is $450.00 and the adapter needed if you now have a spin-on filter is $95.00.  If you mention the Puget Sound RVators when you order the prices are $385.00 and $85.00.  The filter assembly includes mounting brackets and needed hoses.  This offer is not limited to members of the Puget Sound RVators.  Any RV builder/flyer may take advantage of this offer; you must mention the Puget Sound RVators to get the special price, though.  [This offer may not still be available—Webmaster.]

Contact the Aviation Development Corporation, 1305 NW 200th ST, Seattle WA 98177   (206) 546-3011;  Joe Breuer, owner.
I had been disappointed with the spin-on filter that I had originally installed on my RV-6 and decided to convert to the ADC-Oberg filter.  As promised, the conversion was relatively simple and took only about 1-1/2 to 2 hours; much of the time was spent draining the oil and removing the oil that spilled down the rear of the engine when I unscrewed the spin-on filter.  This was the main reason that I was changing to the ADC-Oberg filter; there is very little room between the engine and the firewall and whenever I unscrewed the spin-on filter about two or three tablespoons of oil leaked down the back of the engine.  As you can imagine, that created quite a mess and the smell of burning oil during flight can be extremely unnerving.

One disadvantage of the ADC-Oberg filter is the weight.  It weighs about 2 1/2 lbs with the associated hoses.  If you’re trying to keep your RV as light as possible you might want to use some other filter.  The effect of the extra weight is to move the CG forward which can help those RVs that have a rear CG problem.

One of the advertised benefits of this filter is reduced oil temperature; I experienced an increase in oil temperature.  The oil temperature in my RV-6 rarely reached the green arc before installation of this filter.  After the conversion, the oil temperature stays in the low range of the green arc. However, I also changed from a single viscosity oil (40 weight) to a multi-viscosity semi-synthetic (15-50 weight) oil at the same time I changed to the ADC-Oberg filter.  My guess is that the multi-viscosity oil is more fluid and has a tendency to splash onto the cylinders and is absorbing more heat than the single viscosity oil that was in the engine before the filter conversion.

I’m sure the prices are not the same but if you do order the filter be sure to ask for the discount.  Remember every dollar saved goes for gas when your RV is flying.


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