X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 890063 for flyrotary@lancaironline.net; Wed, 20 Apr 2005 13:02:54 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050420170210.MPRS2470.imf19aec.mail.bellsouth.net@rd> for ; Wed, 20 Apr 2005 13:02:10 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: stock 3rd gen oil filter- bypass valve? Date: Wed, 20 Apr 2005 12:02:09 -0500 Message-ID: <002301c545ca$b0d05200$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0024_01C545A0.C7FA4A00" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0024_01C545A0.C7FA4A00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 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.=20 =20 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. =20 I guess Rusty is going to have to cut one open.=20 =20 So shall it be done (if necessary). =20 =20 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. =20 Sort of like shooting a rat with a cannon, but no doubt it will get the = job done :-) =20 Cheers, Rusty (no room for a cannon, though it would be cool)=20 ------=_NextPart_000_0024_01C545A0.C7FA4A00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Yeah; I = agree=20 completely; but what would “trip” that internal filter = bypass; the oil pressure=20 remains about the same even if the filter is very dirty; unless = increasing the=20 flow to the pressure regulator significantly increases pressure. 
 
There's a spring=20 loaded valve inside most filters, that allows the oil to bypass the = filter=20 element when necessary.  It's actuated by differential = pressure across=20 the element, and is unaffected by overall oil pressure.  I = think I=20 saw a note on the Fram site that said the pressure was=20 typically 16 psi that it took to open the valve. =20 Don't quote me on that number though. =20     
 
 I guess Rusty is going to have = to cut one=20 open. 
 
So shall it be=20 done (if necessary).   

 

Or do what = I=20 did.  Full flow remote dual filter block with K&n HP-1 filters = (with=20 high pressure bypass); and only filtered oil going through the cooler = and back=20 to the engine.

 

Sort of like=20 shooting a rat with a cannon, but no doubt it will get the job = done=20 :-)

 

Cheers,

Rusty (no room=20 for a cannon, though it would be=20 cool) 

------=_NextPart_000_0024_01C545A0.C7FA4A00--