Return-Path: Received: from imo-m26.mx.aol.com ([64.12.137.7] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 881101 for flyrotary@lancaironline.net; Sun, 17 Apr 2005 16:42:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.7; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m26.mx.aol.com (mail_out_v38.7.) id q.1a5.358dc093 (3948) for ; Sun, 17 Apr 2005 16:41:41 -0400 (EDT) From: WRJJRS@aol.com Message-ID: <1a5.358dc093.2f942405@aol.com> Date: Sun, 17 Apr 2005 16:41:41 EDT Subject: Re: [FlyRotary] Re: Apex Seal Groove Wear and Air Filters was Re: [FlyRotary]... To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1113770501" X-Mailer: 9.0 for Windows sub 5038 -------------------------------1113770501 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 4/17/2005 9:27:23 AM Pacific Standard Time, jerryhey@earthlink.net writes: Hi Leon. I am in complete agreement about the need for air filtration. On one hand we have the need for filtered air and on the other we want the performance boost from ram air. If we supply ram air to a plenum and filter it before it enters the engine, is there a significant performance hit? If so could the ram effect be regained by using a larger filter, bigger scoop, and so on. I am building my intake right now and it will have filtered air with the option of switching to ram air at altitude. Do you think this is a good idea? Certainly some dust exists even at 10,000 ft. Jerry Jerry, I'll be interested in Leon's take as well, but I wanted to kick in here. Yes you can ram air a filtered plenum. If you look at any of the newer motorcycles 600cc + you will find that all the sports and performance bikes use ram air, and the largest plemum box they can fit in the frame practically. There is a noticeable power increase that I tested on the track. Run the biggest filter you can fit in for the lowest pressure drop. I like the K&N oiled filter element. Bill Jepson -------------------------------1113770501 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 4/17/2005 9:27:23 AM Pacific Standard Time, jerryhey= @earthlink.net writes:

Hi Leon. I am in complete agreement abou= t the need for air filtration.
On one hand we have the need= for filtered air and on the other we
want the performance boost from ra= m air. If we supply ram air to a
plenum and filter it before it en= ters the engine, is there a
significant performance hit? If so cou= ld the ram effect be regained by
using a larger filter, bigger scoop, an= d so on. I am building my
intake right now and it will have filter= ed air with the option of
switching to ram air at altitude. Do&nbs= p; you think this is a good idea?
Certainly some dust exists even=20= at 10,000 ft. Jerry

Jerry,

I'll be interested in Leon's take as well, but I wanted to kick i= n here. Yes you can ram air a filtered plenum. If you look at any of the new= er motorcycles 600cc + you will find that all the sports and performance bik= es use ram air, and the largest plemum box they can fit in the frame practic= ally. There is a noticeable power increase that I tested on the track.= Run the biggest filter you can fit in for the lowest pressure drop. I like=20= the K&N oiled filter element.

Bill Jepson

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