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Some Oil thoughts 200 1984

posted by  Don Foster on  Fri Apr 5 11:31 CST 2002
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

"...and Fram PH-43 filters on my 240 N/A cars since 1980..."

Someone here once called these the "orange kiss of death."

"The PH-43 filter was a recommendation from Nils Nilsson, my certified Volvo mechanic. It is the next size up from what Volvo uses, and it's a whole lot easier to get a grip on..."

Be careful. Aside from shoddy craftsmanship in a Fram, a longer filter will have a lower resonant frequency (much as a longer pendulam swings slower). This means that in some circumstances, at high RPM, the filter can experience sympathetic or harmonic vibration and might even fracture.

It's highly unlikely, but it's one reason that some hi-rpm and/or hi-vibration engines (some diesel, for example) use short, squat filters.

In my opinion, you CANNOT go wrong with a Mann filter. If you shop carefully, you'll get them for around $3.50 each.
--
Don Foster (near Cape Cod, MA)






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