Return-Path: Received: from [65.33.164.105] (account marv@lancaironline.net) by logan.com (CommuniGate Pro WebUser 4.2) with HTTP id 379277 for lml@lancaironline.net; Thu, 26 Aug 2004 12:35:34 -0400 From: "Marvin Kaye" Subject: Re: [LML] Re: EGT Limits for TSIO 550's To: lml X-Mailer: CommuniGate Pro WebUser Interface v.4.2 Date: Thu, 26 Aug 2004 12:35:34 -0400 Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit Posted for Walter Atkinson : Jack: Thanks. The TIT limit is not related to the engine in any way. It is a factor in whether or not the turbo has Inconel rotors or not. The standard rotors are limited to 1650dF and the Inconel rotors have a 1750dF limit. These limits are set by the turbo manufacturer, not the engine manufacturer but will no doubt be included in the engine manual. I was unaware that that particular engine was being shipped with Inconel rotored turbos. That's good to know. Thanks. There are no EGT limits. Back to the TIT limits. The purpose of a temp limit is not to allow a situation where the max rotor speed and temperature could combine to result in enough rotor creep so that it touches the inside of the case. That would result in failure. Soooo, if the rotor is not turning at max rpm and the temp is under max, there is not problem. The rotor only turns at max above the critical altitude for the wastegate to be fully actuated. You can control the temp with the mixture. I hope that helps clear any confusion about why we have TIT limits and no EGT limits. Walter Atkinson Advanced Pilot Seminars > You might want to look at the Continental engine manual for the TSIO 550 > engine as I believe you might find the manufacturers EGT limits are 1750 dF > and 1800 for 30 seconds.