X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.4.51.85] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 989851 for flyrotary@lancaironline.net; Thu, 09 Jun 2005 09:39:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.4.51.85; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Thu, 9 Jun 2005 06:39:09 -0700 Message-ID: Received: from 64.4.51.220 by BAY107-DAV13.phx.gbl with DAV; Thu, 09 Jun 2005 13:39:09 +0000 X-Originating-IP: [64.4.51.220] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Very strange problem after installing new turbo Date: Thu, 9 Jun 2005 09:39:07 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0246_01C56CD7.14BD83E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 Seal-Send-Time: Thu, 9 Jun 2005 09:39:07 -0400 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 X-OriginalArrivalTime: 09 Jun 2005 13:39:09.0504 (UTC) FILETIME=[9D33E400:01C56CF8] This is a multi-part message in MIME format. ------=_NextPart_000_0246_01C56CD7.14BD83E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dave, That is a strange one. I've had rpm drop from things like blown intake = hoses, but the rpm didn't come back until the hose was fixed. Most of the problems you listed might cause an rpm "wall", but not a = repeatable drop. This might not make much sense, but it sounds like = something giving under pressure to me. What could "give under pressure", = but then return to normal when pressure is removed? Something like a = radiator pressure cap, a pop-off valve....an O ring? The other thing I might suspect would be something in the ignition = tuning that's triggered at the peak rpm. A timing thing? See if retarding the ignition changes things. Just SWAGs. Regards, John Good advice on the timing. Do it NOW Dave. Tracy ------=_NextPart_000_0246_01C56CD7.14BD83E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
 
Dave,
That=20 is a strange one. I've had rpm drop from things like blown intake = hoses, but=20 the rpm didn't come back until the hose was = fixed.
Most=20 of the problems you listed might cause an rpm "wall", but not a=20 repeatable drop. This might not make much sense, but it sounds like = something=20 giving under pressure to me. What could "give under pressure", but = then return=20 to normal when pressure is removed? Something like a radiator pressure = cap, a=20 pop-off valve....an O ring?
 
The=20 other thing I might suspect would be something in the ignition tuning = that's=20 triggered at the peak rpm. A timing thing?
See=20 if retarding the ignition changes things.
 
Just=20 SWAGs.
Regards,
John
 
 
Good advice on the timing.  Do it NOW Dave.
 
Tracy
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