<VV> Oil Filters & gpm (Gallons per minute)

[Harry Yarnell]

I don't think this is right. If you've ever taken an oil filter apart, 
you'll see that the oil passes THRU the medium.
As for the bypass opening up after startup, maybe. With high oil pressure at 
startup, and no pressure on the outlet of the filter, MAYBE the relief will 
open, but MAYBE for a second or two.

harry yarnell
Poohbah of Perryman
perryman garage and orphanage
hyarnell1 at earthlink.net
----- Original Message ----- 
From: "BBRT" <chsadek at comcast.net>
To: <virtualvairs at corvair.org>
Sent: Sunday, May 11, 2008 10:20 AM
Subject: <VV> Oil Filters & gpm (Gallons per minute)


> Happy Mothers Day!
>
> I have been looking into gpm oil requirements for a Corvair engine.  I 
> came across comments touting Pure Power Oil Filter.  Basically two points 
> I offer up for opinions by our esteemed readers...
>
> First, the claim that most oil filters trap debris by oil flowing across 
> oil filter paper, not thru it.  "Most "throw away" filters flow oil at 7-9 
> gpm and is known in the industry as a "nominal extraction" filter. In a 
> "throw away" filter the oil DOES NOT go THROUGH the paper filter --it is 
> designed to run the oil BY the paper element. Small (NOMINAL) amounts of 
> debris are then "snagged" or settle in the valley of the pleats. In most 
> paper filters the Bypass opens up shortly after engine startup.
>
> Is the above statement true?