ead article. Sound pretty effective to me. Bubble all the air thru oil.(quoted from post at 09:57:03 01/04/10) See my comments on this website.
http://vintagetractorengineer.com/2009/01/oil-bath-air-cleaners-for-tractors/comment-page-1/#comment-570
love that Ken! If I stop breathing, my lungs won't get messed up by all the polluted air! Cool!(quoted from post at 13:17:54 01/04/10) Without the filter mesh they aren't very good. Dust can get carried
through in a bubble.
Also for your info, as modern paper filters get dirty, they get
better. The plugging of the paper makes the holes smaller so they
filter even smaller particles.
Of course once it is completely plugged the engine won't run, but
its very clean air right before that!
our 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.(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.
(quoted from post at 19:34:20 01/04/10) In the days of oil bath filters your car or truck engine was do for a rebuild at 100000. miles and needed to be bored out too. Now I buy cars with 100000. and don t expect them to use oil. BTW diesel motors oil is black by the first 10 hours, my CAT is black when you check the oil during an oil change.
Ron, you can beat this horse from now on, but all the discussion is academic, theorizing & speculation without supporting facts (i.e., test results similar to those in the link that someone posted for Duramax filter comparisons). Yeah, it fills the time on a cold winter day, but that is about it. Kinda like the ethanol argument on another thread where Jon claims that he gets better mileage with ethanol than with pure gasoline........the physics doesn't support it & the argument can go on forever, BUT then real world testing by not only the EPA, but nearly every automobile magazine published, rears it's ugly head & low & behold, they all show lower gas mileage with ethanol! Surprise, surprise as Gomer used to say. Gee, I guess that's why they use higher flow capacity injectors or lengthen the injector squirt time of ethanol capable vehicles.(quoted from post at 11:16:11 01/07/10) Keith, You make some good points. Regarding the bubbles, I am aware that in most designs the air does not bubble thru the oil reservoir but another web site claims that is does. My point was that even if that were the case, a large portion of the fine dust stays within the bubble not getting close to the oil. A particle of fine dust moves thru the air about as fast as 140 weight gear oil pours in cold temperatures. (This forum seems to not take long replies so will try to reply in several chunks. Here goes)
understand the physics of your laminar flow position & another excellent example of it is the water flow in a river.......not much movement near the back & progressicely faster until reaching a maximum at mid river.(quoted from post at 11:39:47 01/08/10) Yup, cabin fever needs some activity to make it more tollerable. I like VALID test data too but coffee shop claims usually have an unknown fudge factor applied. The laws of Physics are factual and will not tolerate violations. However, the Physics laws are often not understood and therefore will not be accepted as factual. That is natural. Thanks to all for their feedback.
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