Hottest cylinder may or may not be the leanest. The hottest (CHT) cylinder is usually the rear right or rear left depending on which way your prop turns. The leanest cylinder depends more on your intake system than anything, but other factors come into play including exhaust scavenging, cylinder health, etc. Take a look at your plugs after a flight with minimum idle running after you land and see if you can tell if any cylinders are looking leaner than the one you have the EGT on. On a certified engine with the original intake and carb they will always be pretty even, well usually anyway.
Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Robert L. Stone Sent: Friday, November 25, 2005 7:21 PM To: KRnet Subject: Re: KR> Engine heat Brian, Thanks much for taking the time to provide me with the answer that you have. I am using a system that conects to one sensor to the cylinder that is supposed to be the one that runs the hotest of the four. Bob Stone ----- Original Message ----- From: "Brian Kraut" <brian.kr...@engalt.com> To: "KRnet" <kr...@mylist.net> Sent: Friday, November 25, 2005 6:10 PM Subject: RE: KR> Engine heat >I have seen published EGT never to exceed temps before, but only on factory > planes that have the probe in the same place. What your maximum is will > depend on where the probe is and a little bit on how the air flow is over > the exhaust. > > When you are leaning the engine you are looking for what the peak EGT is > as > you pull the mixture back. The actual number is not really that > important. > > When you are at your cruise power setting you want to slowly pull the > mixture back a little at a time. Let the EGT settle for 5 to 10 seconds > each time you pull back a little. You will eventually reach a point where > you get a peak temperature and pulling back the mixture any more will > cause > the temp to decrease. Once you have found the peak you want to push the > mixture in where it is 25 - 50 degrees rich of peak for a good economy > cruise. Your best power setting will be about 100 degrees rich of peak. > You will find that your peak temp wil vary some depending on your power > setting, altitude, and outside air temp, but you can still find the peak > at > any setting. > > I have found that with exhaust wrap that it is much easier to find the > peak > on my Midget Mustang than it was without it. > > You will get some differences of opinion on weather you should run rich of > peak, lean of peak, or at peak. If you have a good matched set of fuel > injectors like the Gami ones you can safely run best a little lean of > peak. > When you are using a carburated engine or regular injectors that are not > matched and you only have one EGT you need to err on the rich side because > you might have one or more other cylinders that are leaner than the one > you > have the EGT on and you can damage them. > > Brian Kraut > Engineering Alternatives, Inc. > www.engalt.com > > -----Original Message----- > From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On > Behalf Of Robert L. Stone > Sent: Friday, November 25, 2005 1:14 PM > To: KR Builders Pilots > Subject: KR> Engine heat > > > Netters, > I hope one of you is knowledgeable enough to provide me with > information I need to use my EGT gauge. I need facts rather than > opinions. > I am running a 110 horse Lycoming > engine and just had an EGT gauge installed. The gauge is set to alarm at > 1500 degrees and this seems high to me. Can anyone tell me when climing > to > altitude and thining the mixture what would be the best temperature for > maximum fuel economy and engine health. I would also like to know what > the > never exceed temperature would be. > > Bob Stone > > > _______________________________________ > 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 > > > > _______________________________________ > 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 > _______________________________________ 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
