Return-Path: Received: from smtpauth09.mail.atl.earthlink.net ([209.86.89.69] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 884572 for flyrotary@lancaironline.net; Wed, 20 Apr 2005 10:21:28 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.86.89.69; envelope-from=Dastaten@earthlink.net Received: from [24.238.206.157] (helo=earthlink.net) by smtpauth09.mail.atl.earthlink.net with asmtp (Exim 4.34) id 1DOG4K-00057L-Di for flyrotary@lancaironline.net; Wed, 20 Apr 2005 10:20:44 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=simple; s=test1; d=earthlink.net; h=Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:To:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=geK514omHflQ71LqcuF8G5gfv/gZ221fAEPfGbEvSeRVRR3vx47wxbtwbABTE01g; Message-ID: <42666555.3030706@earthlink.net> Date: Wed, 20 Apr 2005 09:21:09 -0500 From: David Staten User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: stock 3rd gen oil filter- bypass valve? References: In-Reply-To: Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit X-ELNK-Trace: 9a30bff84e6cb88f95c85d38d22416599ef193a6bfc3dd4838b7970b63cd5cd670db096d3aefe4cc8093ec8fa1ef8ec6350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 24.238.206.157
Al Gietzen wrote:

Message

The question was - Does the stock 3rd gen filter have a bypass? I'm guessing it does.

Cheers,

Rusty

I’m not sure why it would – it is not a full flow filter. The filter block is ported so some oil goes through the filter to the engine, and some bypasses to the pressure control valve – back to the pan.

Al

I disagree.. but I don't know the answer for sure. What I do know is that if the filter plugs up under the situation you are describing, oil flow to the engine (through the filter) would be nil.. Because the ONLY path for oil into the engine from the stock rear-iron pedestal is THROUGH the filter assembly (out the pedestal to the filter, then back into the pedestal to the interior of the engine). I've proven this conclusively with my multiple cores... But you would still get an adequate oil pressure reading because the oil pressure transducer gets it's feed off the path to the pressure regulator, which originates "before" the filter in the plumbing scheme.

That is an unacceptable possibility that would destroy the engine for want of a "cheap" oil filter. Having a filter with an internal bypass provides that protection to the engine.. dirty lubrication is usually a mite or two better than no lubrication at all. I should have cut open one of my used filters on the set of 3 engines when I disassembled them.. but never thought about it then.. and I've since cleaned out the "factory" er.. garage.

Dave