I normally cruise from 8,000 to 10,000 feet. My engine (O-200) will barely run there at full rich. I lean gradually as I go up and gradually as I go down.
Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Rich Seifert Sent: Thursday, January 05, 2006 9:00 PM To: KRnet Subject: Re: KR> High EGTs (Ignore the Numbers) If you adjust your mixture by leaning to a numerical EGT reading, you are just asking for an engine failure. Exhaust Gas Temperature readings are something that few pilots seem to understand. Unless the EGT sensors were installed at the factory where they can be calibrated and where each installation is identical you should ignore the numbers. There are enough variables in our installations that numerical degree readings are useless, unless each installation is calibrated often. There is a a tool for (in the field) calibration of EGT's if you really want to do this; but most mechanics realize that the system would need to be re-calibrated often. Many certified EGT gauges do not even have numbers on them; just an adjustable red line. If you learn the proper leaning proceedure which includes going to full rich when decending for a landing; you don't need to have your EGT system calibrated even once and you never need to care about the numerical EGT value. If you are buying an EGT system; look for a EGT gauge with an adjustable red line and forget about numerical degree values. After you have your engine jetted properly on the ground; forget about adjusting mixture until you reach your crusing altitude; then lean to peak needle reading and set you red line at that position. I was taught to enrichen the mixture by 50 rpm to be on the safe side (as too lean a mixture will burn holes in pistons). I understand some pilots were taught to run 50 rpm on the lean side, but I suspect that training was for a specific set of engine paramitors (MAP, RPM, Altitude). ----- Original Message ----- From: "Stanley Mello" <myplanewo...@hotmail.com> To: <kr...@mylist.net> Sent: Tuesday, January 03, 2006 7:45 PM Subject: KR> High EGTs > As was asked, I do have and inflight adjustable mixture conrtrol and an > Air-Fuel Ratio meter. Everything seemed fine except for the EGT. Also the > reason for the 6.9 to 1 compression ratio is to allow for the 91 Octane auto > fuel here in Calif. The plugs look OK. I was richening the mixture until the > engine would start to run rough and missfire and the lean until the missfire > would stop, thinking that the mixture would be rich enough to cool the EGTs. > Any comments on intake systems? > > _________________________________________________________________ > Express yourself instantly with MSN Messenger! Download today - it's FREE! > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ > > > > _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
