I fly behind an O-200 with a four position EGT and four position CHT. In general, I find cylinder number 3 is the hottest EGT reading and number 2 is the coolest...but number 3 IS NOT the leanest...this normally is number 4, the one that hits its peak first. It is a common misconception that the hottest jug is the leanest...not true; the leanest is the one that hits its peak EGT first as you lean the mixture, even if that peak temperature is lower than for another cylinder in the stack.
For my CHT, number 1 and number 4 are about the same (I see 350 degrees CHT on both with 325 degrees on numbers 2 and 3...with a little variance due to OAT changes). My jugs are Millenniums set at 28 degrees timing and the baffling is very tight. EGT/CHT varies from engine to engine so you really must use such info only as an indicator...testing your own system is really the only way to do it right. The cost of a 4 position EGT is really not all that much more than a single probe model...Westberg makes a good, reasonable unit that goes from a single to a four way with the addition of three extra probes and a rotary switch. John Olav Johnsen Ercoupe 415-E N94783 s/n 4894 Albuquerque, New Mexico -----Original Message----- From: Ed Burkhead <[EMAIL PROTECTED]> To: Coupe-list <[email protected]> Date: Thursday, December 30, 1999 5:14 AM Subject: Re: [COUPERS] CHT/EGT Dick responded to the question (I think) of which cylinder is hottest. Can others give this response, too, please? When we put my single probe egt in the plane, they wanted to know which cylinder is the hottest and does it change with power, speed and outside air temperature. Could those of you with four probe instruments give us what you can on this subject? Dick Chevalier wrote: > > Right front for EGT. 1400. Right rear CHT. 375-400. > Dick in NM -- Ed Burkhead Peoria, Ill. Ercoupe N3802H, 415-D __________________________________________________________________________ __ ____ To unsubscribe from this list please send mail to [EMAIL PROTECTED] _____________________________________________________________ Get your favorite topic delivered daily. http://www.topica.com/t/11 __________________________________________________________________________ ______ To unsubscribe from this list please send mail to [EMAIL PROTECTED] _____________________________________________________________ Get your favorite topic delivered daily. http://www.topica.com/t/11
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