I used to use them, too on racing motorcycle engines that were torn down and
rebuilt
frequently, but for long-term use they have been shown to pass an unacceptable
amount of
the finer, engine-grinding size of crud that a racing engine can tolerate for
its short
span between rebuilds but a street engine is best off without.
This issue has come up on the list a number of times in the last few years, and
I remember
one list member citing a study that was conducted by a company he had worked
for on their
fleet of trucks. Oil analysis showed that the oiled foam filters passed an
unacceptable
amount of particulate matter and they went back to conventional filters.
gary
Chris Robertson wrote:
> What do you mean well known? K&N's are the choice of many racers as well as
> turbo/supercharger manufacturers. What is the reasoning, or evidence?
> Would really like to know as I use them!
>
> Thanks,
> Chris
>
> >K&Ns are well-known to pass as much crud as air... better to have a nice
> >airbox around
> >both carb mouths with room for the stacks and a good, high-quality filter
> >around the whole
> >deal.
> >
> >Gary McCormick
> _________________________________________________________________
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