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NV, this is mainly to answer your post on the argument that filtering isn't so important because the dirt just "burns up" in the combustion process. Well I did my own research by going through a couple of hundred of web pages from a web search, and here are some of the more informative ones: [ http://www.cpinternet.com/~ennyman/syn-dirt.html ]
for a cute article about how most of the dirt in an engine comes from the intake and gets lodged between the piston and cylinder wall [ http://www.pluton.ru/goods/fram/air_filters.html ]
says only 8oz of dirt is needed to ruin an engine [ http://www.bestsyntheticoil.com/amsoil/airfilters-technical.shtml ]
says that dirt particles 5-20microns in size will cause damage [ http://www.sacskyranch.com/dirt.htm ]
[ http://www.wearcheck.ca/FYI/FYI000_203.htm ]
gives a technical explanation of how particulate size becomes important, and how silica (sand) transforms in the combustion process (it doesn't just burn up; when combined with carbon, it becomes a hard abrasive) I did not find anything on the argument that air filtering is not important because dirt "burns up" in the combustion process. Anyone else has anything to contribute to this subject? I think all of us are interested in getting the max hp out of our air filters, and also in minimizing engine wear. So this should be a topic worth discussing. FYI, the Blitz filter is rated at 200micron filtering efficiency.
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