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From: "Wendell Voto" <jwvoto@itlnet.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-657843@logan.com>
Subject: Re: [FlyRotary] Re: Oil Filters
Date: Fri, 4 Feb 2005 21:47:13 -0600
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> Wendell Voto wrote:
>
> > I used and still have one of thoes tissue paper filters. It worked
great.
> > Only reason for not using it now is there is no room in modern car
> > engine compartments to mount this by-pass filter.  Did not change oil
> > in car I used it on, just changed filter and added the quart lost when
> > changing paper.
> > My impression of oil filters is that they will only hold the "big
> > stuff" that might block passages but do little to really help keep oil
> > clean, hence change oil to get dirt out. FWIW
> > Wendell
>
>
> The experts from the oil companies that I listened to at SunNFun,
> indicated that a big part of the oils job was to buffer acids.  The
> acids are caused by water reacting with byproducts of the combustion
> events.  Sulfuric compounds mostly.  There's always some acid, but a
> regularly used engine will have less (the water is constantly being
> boiled off).  Tiny particles, too small for the filter to catch, can be
> held in suspension and never cause an appreciable amount of corrosion,
> IF the oil is changed when it's ability to buffer the acids has been
> used up.  The counter-intuitive part was that a weekender engine uses up
> the buffers FASTER than a busy trainer, as the weekenders and hanger
> queens don't run enough to constantly boil the water off.  The
> disturbing part is that the oil can be as clear as sulfuric acid, and be
> doing your engine a world of hurt.
>
> Of course, this comes straight from the mouth of the horse that's trying
> to sell you some oil 8*)
>
The advocates of the tissue paper filter claimed that the moisture was
removed along with acid producing particles thereby reducing acid damage.
All I know is, the car I had it on was still running like almost new when I
got rid of it; back when 125K miles was real high mileage.
I am temped to put it on the rotary engine but don't want the extra weight
but wouldn't be any heavier than the remote filters.
Wendell (I'd still change oil once in a while)