X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1918591 for flyrotary@lancaironline.net; Tue, 13 Mar 2007 10:28:34 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=dale.r@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao104.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070313142741.WJOM1226.fed1rmmtao104.cox.net@fed1rmimpo02.cox.net> for ; Tue, 13 Mar 2007 10:27:41 -0400 Received: from [192.168.1.100] ([72.223.48.245]) by fed1rmimpo02.cox.net with bizsmtp id aETh1W00m5HQYSo0000000; Tue, 13 Mar 2007 10:27:42 -0400 Message-ID: <45F6B4D1.3000000@cox.net> Date: Tue, 13 Mar 2007 07:27:29 -0700 From: Dale Rogers Reply-To: dale.r@cox.net User-Agent: Thunderbird 1.5.0.10 (Windows/20070221) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Engine noise and changes in timeing and mixture. References: In-Reply-To: Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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