Moroso #22459 Oil
Filter, Racing, 13/16-16 in. Thread, 4.281 in.
High, Chevy Type, Each.
After many years
of designing and testing racing oil systems and related
components, Moroso has collected a great deal of information to
determine what's most important to oil filtration. Their conclusion
was Total Filtration Time! Many filter manufacturers stress the importance
of filtering some of the smallest particles known to man out of your
engine's oil. You've probably seen or heard them talk about "micron
ratings" of 10 or less when talking about a filter's efficiency. One
micron is one-millionth of a meter and a "micron rating" of 10 means that
the filter will remove particles as small as 10 millionths of a meter.
Moroso engineers have determined, with the help of research performed by
filtration technology experts, that particles smaller than 20 microns in
diameter are not large enough to produce engine wear. Furthermore, Moroso
engineers have also found that filters with extremely low micron ratings
create an excessive pressure drop across the filter. They can be so
restrictive that the filter by-pass valve can open. And with the by-pass
valve open, no filtration occurs, and you have no way of knowing. To
maximize filter performance, Moroso oil filters have a rating of 27
microns, which produces a maximum initial restriction of only 2.5 psi when
tested to SAE j806. The result is less pressure drop, more flow, less oil
by-pass and maximum filtration performance that's so important in severe