Return-Path: <13brv3@bellsouth.net> Received: from [205.152.58.102] (HELO imf56bis.bellsouth.net) by logan.com (CommuniGate Pro SMTP 4.1b7) with ESMTP id 2403487 for flyrotary@lancaironline.net; Thu, 05 Jun 2003 08:44:44 -0400 Received: from rad ([68.212.14.46]) by imf56bis.bellsouth.net (InterMail vM.5.01.04.25 201-253-122-122-125-20020815) with ESMTP id <20030605124658.DYJM20181.imf56bis.bellsouth.net@rad> for ; Thu, 5 Jun 2003 08:46:58 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: air filters? Date: Thu, 5 Jun 2003 07:44:44 -0500 Message-ID: <000001c32b60$3da600d0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C32B36.54CFF8D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C32B36.54CFF8D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I'm using a K&N air filter. I considered going without, but = since I expect to operate out of allot of dirt strips and I really don't think = it would be too healthy for the turbo compressor, I decided to incorporate = one. =20 Hi Todd, =20 I'm curious, what size is your filter? I have a K&N cylindrical style filter, that's 6" long, and 3.5" diameter, and is made to fit over a = 2.5" diameter flange. They claim it will flow 900 cfm, and I can only hope = that they mean at a reasonable pressure differential. Spruce sells preformed aluminum flanges in several sizes, so I plan to rivet a couple of those = back to back on the side of a simple air box. Since the right cheek is = empty, I'll probably go ahead and install the filter over there. I'll use the = same size tubing for the inlet and outlet of the filter box, so I can bypass = it for tests. Actually, while thinking about the issue of gyro loads on = the turbo bearings, I wish I had some sort of filter or screen between the = turbo and intake. A broken compressor blade would ruin your day. =20 =20 Another factor to consider is the turbo boost. Unrestricting the intake = has the same effect as unrestricting the exhaust, and doing both will get = you in real trouble with a 3rd gen RX-7. If boost creep is a serious problem, maybe I can borrow Mark's oil soaked filter :-) =20 =20 Cheers, Rusty (eternally two months from flying) ------=_NextPart_000_0001_01C32B36.54CFF8D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable RE: [FlyRotary] air filters?

        I'm using a K&N air filter. I considered going without, but = since I expect to operate out of allot of dirt strips and I really don't think = it would be too healthy for the turbo compressor, I decided to incorporate one. =

 

Hi Todd,

 

I’m curious, what size is = your filter?  I have a K&N cylindrical style filter, that’s = 6” long, and 3.5” diameter, and is made to fit over a 2.5” = diameter flange.  They claim it will flow 900 cfm, and I can only hope that = they mean at a reasonable pressure differential.  Spruce sells preformed aluminum flanges in several sizes, so I plan to rivet a couple of those = back to back on the side of a simple air box.  Since the right cheek is = empty, I’ll probably go ahead and install the filter over there.  I’ll = use the same size tubing for the inlet and outlet of the filter box, so I can = bypass it for tests.  Actually, while thinking about the issue of gyro loads = on the turbo bearings, I wish I had some sort of filter or screen between the = turbo and intake.  A broken compressor blade would ruin your day.  =

 

Another factor to consider is the = turbo boost.  Unrestricting the intake has the same effect as = unrestricting the exhaust, and doing both will get you in real trouble with a = 3rd gen RX-7.   If boost creep is a serious problem, maybe I can = borrow Mark’s oil soaked filter :-) 

 

Cheers,

Rusty (eternally two months from = flying)

------=_NextPart_000_0001_01C32B36.54CFF8D0--