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#1
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Air filter test
Steve
Ive been deeply involved in filtration engineering for almost 30 years ..... this test is HOGWASH and marketing HYPE. It purports unsupported claims vis a vis NO mention of the nature of the test contaminent (usually AC FINE test dust ... an industry standard). NO mention is made of the face velocity nor control of the velocity of air flow, etc. etc. The fact of the matter is that ALL these 'manufacturers' DO NOT make the filter media (resinated technical paper) ... and there are only 3 technical paper mills supplying the WHOLE of this segement of the automotive filter market .... so the question therefore is if essentially 3 paper mills are make all the paper, then how come the differences. K&N is known poor technology, but the difference of the others .... HYPE and marketing. In article , Steven Shelikoff wrote: http://home.usadatanet.net/%7Ejbploc...011/SPICER.htm |
#2
posted to rec.boats,rec.boats.cruising
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Air filter test
Rich Hampel wrote: Steve Ive been deeply involved in filtration engineering for almost 30 years .... this test is HOGWASH and marketing HYPE. It purports unsupported claims vis a vis NO mention of the nature of the test contaminent (usually AC FINE test dust ... an industry standard). NO mention is made of the face velocity nor control of the velocity of air flow, etc. etc. The fact of the matter is that ALL these 'manufacturers' DO NOT make the filter media (resinated technical paper) ... and there are only 3 technical paper mills supplying the WHOLE of this segement of the automotive filter market .... so the question therefore is if essentially 3 paper mills are make all the paper, then how come the differences. K&N is known poor technology, but the difference of the others .... HYPE and marketing. Thanks for lending your expertise. It's good to hear from someone who's actually in the field. |
#3
posted to rec.boats,rec.boats.cruising
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Air filter test
The 'trickery' in such marketing hype is pricipally due the the larger
surface area of the 'target' filter. There's a moral he buy the LARGEST filter that will fit as the velocity THROUGH the filter media will be at its slowest and the particles will have sufficient 'dwell time' to adsorb and be captured by the filter media. Air filtration doesnt have 'pores' the size of the particles you want to capture ... in actuality (and more importantly for the smaller particles) its the energy of the particles (brownian motion amplitude) allowing capture of very small particulate with relative large 'pores'. Its the 'dwell time' inside the filter media that does the 'filtration'. So if you used a container of compressed pubic hair it would filter quite well if you keep the velocity of the gas very slow .... but I dont know where you'd find that much pubic hair. Gas/air filters are rated on 'most penetrating particle' vs. velocity .... when you see that statement omitted you now that someoe is trying 'to sell you a bridge'. Especially when the data refers back to an ISO standard which typicallly has more to do with political exclusion of 'foreign' manufacturers from the EU marketplace than simply 'whats the best to use'. The most damaging particle acknowledged by the automotive industry is about 20 micrometers ... a very large particle and a particle that settles very quickly by simple gravity. Just remember to 'size' your air filter at: AS LARGE A SURFACE AREA THAT YOU CAN AFFORD. Simple! In article .com, basskisser wrote: Rich Hampel wrote: Steve Ive been deeply involved in filtration engineering for almost 30 years .... this test is HOGWASH and marketing HYPE. It purports unsupported claims vis a vis NO mention of the nature of the test contaminent (usually AC FINE test dust ... an industry standard). NO mention is made of the face velocity nor control of the velocity of air flow, etc. etc. The fact of the matter is that ALL these 'manufacturers' DO NOT make the filter media (resinated technical paper) ... and there are only 3 technical paper mills supplying the WHOLE of this segement of the automotive filter market .... so the question therefore is if essentially 3 paper mills are make all the paper, then how come the differences. K&N is known poor technology, but the difference of the others .... HYPE and marketing. Thanks for lending your expertise. It's good to hear from someone who's actually in the field. |
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