Mailing List flyrotary@lancaironline.net Message #20559
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: stock 3rd gen oil filter- bypass valve?
Date: Wed, 20 Apr 2005 12:02:09 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
Yeah; I agree completely; but what would “trip” that internal filter bypass; the oil pressure remains about the same even if the filter is very dirty; unless increasing the flow to the pressure regulator significantly increases pressure. 
 
There's a spring loaded valve inside most filters, that allows the oil to bypass the filter element when necessary.  It's actuated by differential pressure across the element, and is unaffected by overall oil pressure.  I think I saw a note on the Fram site that said the pressure was typically 16 psi that it took to open the valve.  Don't quote me on that number though.      
 
 I guess Rusty is going to have to cut one open. 
 
So shall it be done (if necessary).   

 

Or do what I did.  Full flow remote dual filter block with K&n HP-1 filters (with high pressure bypass); and only filtered oil going through the cooler and back to the engine.

 

Sort of like shooting a rat with a cannon, but no doubt it will get the job done :-)

 

Cheers,

Rusty (no room for a cannon, though it would be cool) 

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