Ron Sa said: (quoted from post at 13:38:38 01/04/10) Here is what I wrote on the other website that I mentioned.
It is a myth that oil bath air cleaners are highly effective in removing FINE dust from air—the type of dust that we see hanging in the air and gets sucked into the engine’s inlet. Oil bath air cleaners are about as effective as seining minnows using hog wire fence. How do I explain this without 10 pages of technical formulas and explaniations why fine dust cannot travel rapidly from the center of an air bubble to the spherical surface of an air bubble even under several Gs of inertia force? The air bubble traveling thru oil only contacts the oil at the bubble’s surface. Fine dust away from the surface of the bubble escapes capture in the oil resevoir which amounts to about 90% of the fine dust within the bubble escaping capture. So what does the wire mesh accompolish? Very little. Air traveling past the wire mesh’s surfaces creates a boundary layer which has a similiar affect to having a glove on your hand. When passing thru the wire mesh, only a small percentage of the air’s volume gets used as boundary layer. Most of the dust-filled air passes thru the short length of wire mesh with out contacting any oil on the wire mesh’s surface. If the length of wire mesh was say 20 feet instead of a few inches, a lot of the dust would get trapped. Inside the engine, most of the dust in the air exits thru the exhaust but some of the dust contacts the oil on the cylinder wall. This dust acts like a lapping compound that wears out the sleeve and rings. It eventually shows up as crud inside the engine or as the black color of the oil.
Your boundary layer is good for smooth laminar flow, not for the turbulent flow in, around, thru the mesh material. I will/would be much more convinced with a particle analysis comparing before & after air content. Would be neat to see that for pleated paper, K&N, oil bath w/mesh.....done without funding by a filter manufacturer.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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