Return-Path: <13brv3@bellsouth.net> Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.2b6) with ESMTP id 300384 for flyrotary@lancaironline.net; Fri, 09 Jul 2004 09:11:21 -0400 Received: from rd ([65.6.194.9]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040709131050.IYLU1701.imf20aec.mail.bellsouth.net@rd> for ; Fri, 9 Jul 2004 09:10:50 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Turbo post mortem Date: Fri, 9 Jul 2004 08:11:08 -0500 Message-ID: <001101c465b6$32f951f0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0012_01C4658C.4A2349F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0012_01C4658C.4A2349F0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I have read that the water cooling designed in to some automobile turbos is not really for cooling the turbo during operation. It supposedly is to continue to provide some cooling after the engine shuts down. This is my understanding as well, but more specifically, it helps prevent problems caused by the average driver who has no idea what goes on in the engine compartment. The owners manual for the FD states that you should let the engine idle for at least 30 seconds prior to shutting it down. Even as minimal as this requirement is, how many people do you think do it? When I was talking to Turbonetics, they said that water cooling wasn't needed for aircraft, since they get a guaranteed cool down period during descent, and taxi back to the hanger. They also stated that pilots are far more willing to comply with procedures to keep their engine's happy :-) I believe Todd has done at least some of these modifications to his turbo which may account for his lack of turbo problems. Not to be too critical, but isn't Todd the only one (so far) to damage his engine due to overboost induced detonation? Maybe it's just me, but I'd call that a turbo problem :-) BTW, that was a very good explanation of a/r. Cheers, Rusty (yawn) ------=_NextPart_000_0012_01C4658C.4A2349F0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

I have read that the water cooling designed in to some = automobile turbos is not really for cooling the turbo during = operation.  It=20 supposedly is to continue to provide some cooling after the engine shuts = down. 

This is = my understanding=20 as well, but more specifically, it helps prevent problems caused by the = average=20 driver who has no idea what goes on in the engine compartment.  The = owners=20 manual for the FD states that you should let the engine idle for at = least=20 30 seconds prior to shutting it down.  Even as minimal as this = requirement=20 is, how many people do you think do it?  When I was talking to = Turbonetics,=20 they said that water cooling wasn't needed for aircraft, since they get=20 a guaranteed cool down period during descent, and taxi back to the=20 hanger.  They also stated that pilots are far more willing to = comply with=20 procedures to keep their engine's happy :-)   

I believe Todd has done at least some of these modifications to his = turbo=20 which may account for his lack of turbo problems.

Not to be too critical, but isn't Todd the only = one (so=20 far) to damage his engine due to overboost induced detonation?  = Maybe it's=20 just me, but I'd call that a turbo problem :-) 

BTW, that was a very good = explanation=20 of a/r. 

Cheers,

Rusty=20 (yawn)

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