quote:
Originally posted by kctom:
Grease Is the word
As I said before, when the base plate is pressed onto the filter the center tube is squished pinching the cardboard at each end of the filter forming a seal preventing the "dirty oil" from leak into the filtered oil. You can tell in these pictures that there is pressure exerted, by the end support, onto the cardboard. Can you see the indentation formed? When the engine is operated, the inward pressure on the end support is going to push against the cardboard harder and harder thereby reenforcing the seal. Cardboard has been used for years and years as a gasket material.
Please present some evidence that a good seal is not formed.
This may or may not be the "greatest" evidence, but for me it says, "why buy Fram?"
My application is the PH5 GM (Mercruiser boats). Here is a PH5 with a flashlight shinning in the opposite end of the canister. The cardboard, paper, whatever you want to call it, is not concentric and light shines through.
If this filter were like the same priced STP S5 (Champion) for $3, it would have a solid metal end (there are no bypass valves on these filters) and the leaf spring would be against a solid metal bottom. There wouldn't be a need for the leaf spring to plug a cardboard hole.
Likewise, on the other end, the nitrile ADV is about 1/16" smaller than the cardboard hole. On the same $3 AC filter, the ADV seals against a solid metal neck.
Also, when I compare these two filters for the same $3 -- STP S5 and Fram HP5: the Fram has 91 sq/in of filter medium and the STP has 163.
For me, it is a no brainer -- questionable seals and far less medium -- I'll take the same priced STP.
[ November 15, 2003, 09:12 PM: Message edited by: Grease is the word ]