X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from imo-d21.mx.aol.com ([205.188.144.207] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1919203 for flyrotary@lancaironline.net; Tue, 13 Mar 2007 15:14:33 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.207; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-d21.mx.aol.com (mail_out_v38_r7.6.) id q.d03.b0a77fb (60453) for ; Tue, 13 Mar 2007 15:06:39 -0400 (EDT) Received: from webmail-dd21 (webmail-dd21.webmail.aol.com [205.188.104.21]) by ciaaol-r02.mx.aol.com (v114_r3.4) with ESMTP id MAILCIAAOLR022-ec2545f6f63e1fa; Tue, 13 Mar 2007 15:06:38 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: Engine noise and changes in timeing and mixture. Date: Tue, 13 Mar 2007 15:06:38 -0400 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8C933B9DCDBABEE_CD4_4C26_webmail-dd21.sysops.aol.com" X-Mailer: AOL WebMail 24126 Received: from 65.161.241.3 by webmail-dd21.sysops.aol.com (205.188.104.21) with HTTP (WebMailUI); Tue, 13 Mar 2007 15:06:38 -0400 Message-Id: <8C933B9DCDE0E4D-CD4-294D@webmail-dd21.sysops.aol.com> X-AOL-IP: 205.188.104.21 X-Spam-Flag: NO ----------MB_8C933B9DCDBABEE_CD4_4C26_webmail-dd21.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii" Dale, On both rotaries and 2-cycles burning into the exhaust usually is quieter (not at peak pressure at port opening) rether than louder. You often get some wild flames out the exhaust on a rotary with a rich mixture. Bill -----Original Message----- From: dale.r@cox.net To: flyrotary@lancaironline.net Sent: Tue, 13 Mar 2007 6:27 AM Subject: [FlyRotary] Re: Engine noise and changes in timeing and mixture. WRJJRS@aol.com wrote: In a message dated 3/12/2007 9:49:47 PM Pacific Standard Time, WRJJRS@aol.com writes: r Tracy, When I was actively tuning race cars we had a truism that I often used, "everything changes everything". This was a drastic oversimplification, but none the less was true. If you have an engine running very well, a seemingly minor change WILL change exhaust note or timber. On the dyno you would find some adjustments did little, others a great deal. The fact is as you get the mixture closer to right I am afraid you will hear the exhaust not come back up in volume. Bill Jepson OOPS! I meant you WILL hear the exhaust come back up in volume! Bill Bill, The sentence actually makes perfect sense if you add a single "e": "... you will hear the exhaust note come back up in volume." On the other hand, I'm surprised that this is the case. I would have thought that the excess noise might be due to a rich mixture still burning in the exhaust pipe - but I guess that's really more of a timing issue. Dale R. COZY MkIV #1254 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ________________________________________________________________________ AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com. ----------MB_8C933B9DCDBABEE_CD4_4C26_webmail-dd21.sysops.aol.com Content-Transfer-Encoding: 7bit Content-Type: text/html; charset="us-ascii"
Dale,
On both rotaries and 2-cycles burning into the exhaust usually is quieter (not at peak pressure at port opening) rether than louder. You often get some wild flames out the exhaust on a rotary with a rich mixture.
Bill
 
 
-----Original Message-----
From: dale.r@cox.net
To: flyrotary@lancaironline.net
Sent: Tue, 13 Mar 2007 6:27 AM
Subject: [FlyRotary] Re: Engine noise and changes in timeing and mixture.

WRJJRS@aol.com wrote:
In a message dated 3/12/2007 9:49:47 PM Pacific Standard Time, WRJJRS@aol.com writes:
r Tracy,
 When I was actively tuning race cars we had a truism that I often used, "everything changes everything". This was a drastic oversimplification, but none the less was true. If you have an engine running very well, a seemingly minor change WILL change exhaust note or timber. On the dyno you would find some adjustments did little, others a great deal. The fact is as you get the mixture closer to right I am afraid you will hear the exhaust not come back up in volume.
Bill Jepson
OOPS! I meant you WILL hear the exhaust come back up in volume!
Bill
 

Bill,

   The sentence actually makes perfect sense if you add a single "e":
"... you will hear the exhaust note come back up in volume."

On the other hand, I'm surprised that this is the case.  I would have
thought that the excess noise might be due to a rich mixture still
burning in the exhaust pipe - but I guess that's really more of a
timing issue.

Dale R.
COZY MkIV #1254

AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com.
----------MB_8C933B9DCDBABEE_CD4_4C26_webmail-dd21.sysops.aol.com--