Moroso competition Oil Filter, Chevy Short Style.
After many years of designing and testing racing oil systems and related components, Moroso have determined what’s most important to oil filtration. Many filter manufacturers stress the importance of filtering the smallest particles out of the engine’s oil, with references to "micron ratings" of 10 or less for a filter’s efficiency. With the help of research performed by filtration technology experts, Moroso engineers have determined that particles smaller than 20 microns in diameter are not large enough to produce engine wear. Furthermore, filters with extremely low micron ratings have been found to create an excessive pressure drop across the filter. They can be so restrictive that the filter by-pass valve can open, with the by-pass valve open, NO FILTRATION will occur!
To maximise filter performance, Moroso Racing 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 as required under competition conditions.
Cross References
Fram PH30
Fram TG30
Purolator L20049
Motorcraft FL10
WIX 51069
AC PF25
GM 6438261
K&N HP-2002
Hastings LF225
STP S-025