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.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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