X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from omr-m05.mx.aol.com ([64.12.143.79] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6391459 for flyrotary@lancaironline.net; Thu, 25 Jul 2013 22:54:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.143.79; envelope-from=Lehanover@aol.com Received: from mtaomg-ma01.r1000.mx.aol.com (mtaomg-ma01.r1000.mx.aol.com [172.29.41.8]) by omr-m05.mx.aol.com (Outbound Mail Relay) with ESMTP id 3662470000094 for ; Thu, 25 Jul 2013 22:53:37 -0400 (EDT) Received: from core-mob004c.r1000.mail.aol.com (core-mob004.r1000.mail.aol.com [172.29.194.205]) by mtaomg-ma01.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id EF32CE000081 for ; Thu, 25 Jul 2013 22:53:36 -0400 (EDT) From: Lehanover@aol.com Full-name: Lehanover Message-ID: <9f238.61f15403.3f233eb0@aol.com> Date: Thu, 25 Jul 2013 22:53:36 -0400 (EDT) Subject: Re: [FlyRotary] Re: coolers mounted directly to rotary To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_9f238.61f15403.3f233eb0_boundary" X-Mailer: AOL 9.0 VR sub 5203 X-Originating-IP: [184.57.119.231] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1374807217; bh=8NqUOnLDY+D5xc9TSkihyb3cBdA6RkQtwqSOe//1Rm4=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=n6tKEkhTrfn++F7peC0KXCGRWiJe2HdHvooCfUyXyQE2xZeSioB4lL4mlnTN8Js3F VlX33l48DXp/zhYF1r89w8jZUHoNVihAGSvhkprsUh/d1rdlTe2sUCqivLnxudekPb WemnVb3xdTPzlpUyezJq4i93viV1YKpk3YmHZD1E= x-aol-sid: 3039ac1d290851f1e4b04066 --part1_9f238.61f15403.3f233eb0_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Aluminum has a very short fatigue life. Oil lines under pressure can become very rigid, and try to move about with some force. They apply unhappy forces onto the fittings of oil coolers and coolant radiators. Such devices must always be mounted softly. Movement in any direction must be allowed. Mounts are lined with foam strips. Air supplies end with foam seals. You should be able to grab a cooler and move it some in any direction with the engine at take off power. Note that coolers also become quite heavy when filled with liquid. Such coolers respond to lower frequency vibrations as their weight increases. Also they respond to the 4th harmonic of any primary frequency. Although it is tempting to use aluminum from a box store (6061-0) use it only for patterns. I once used a piece for a timing pointer on the dyno and it fell off after about 10 minutes. Two pieces still bolted to the engine. Pointer on the floor. Use 2024-T3 for the real thing. Remember that pressurized hoses try to go to dead straight when under pressure. Use big sweeping bends or formed 90 hose ends with straight runs of hose where possible. Where you see a cooler mounted rigidly over a hole in a panel, you should also see the hoses clamped close by to the same panel. So hoses and cooler move together. Consult any hose book on mounting rules. For work above 8,000 RPM I use RedLine racing synthetic 2 cycle oil. 128:1 or one ounce per gallon. No oil related failures since 1980. Been there, broke that. Lynn E. Hanover --part1_9f238.61f15403.3f233eb0_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Aluminum has a very short fatigue life. Oil lines under pressure can b= ecome=20 very rigid, and try to move about with some force. They apply unhappy force= s=20 onto the fittings of oil coolers and coolant radiators. Such devices must a= lways=20 be mounted softly.

Movement in any direction must be allowed. Mounts are lined with foam= =20 strips. Air supplies end with foam

seals. You should be able to grab a cooler and move it some in any=20 direction with the engine at take off power. Note that coolers also become = quite=20 heavy when filled with liquid. Such coolers respond to lower frequency=20 vibrations as their weight increases. Also they respond to the 4th harmonic= of=20 any primary frequency.

Although it is tempting to use aluminum from a box store (6061-0) use = it=20 only for patterns. I once used a piece for a timing pointer on the dyno and= it=20 fell off after about 10 minutes. Two pieces still bolted to the engine. Poi= nter=20 on the floor. Use 2024-T3 for the real thing. Remember that pressurized hos= es=20 try to go

to dead straight when under pressure. Use big sweeping bends or formed= 90=20 hose ends with straight runs of hose where possible. Where you see a cooler= =20 mounted rigidly over a hole in a panel, you should also see the hoses clamp= ed=20 close by to the same panel. So hoses and cooler move together.

Consult any hose book on mounting rules.

For work above 8,000 RPM I use RedLine racing synthetic 2 cycle oil. 1= 28:1=20 or one ounce per gallon. No oil related failures since 1980.

Been there, broke that.

Lynn E. Hanover

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