---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Tue 12/14/10: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:19 AM - 2010 List of Contributors (Matt Dralle) 2. 12:34 PM - typical peak EGT ? (thomas sargent) 3. 01:00 PM - Re: typical peak EGT ? (Ralph E. Capen) 4. 04:41 PM - Re: typical peak EGT ? (Larry Bowen) ________________________________ Message 1 _____________________________________ Time: 12:19:45 AM PST US From: Matt Dralle Subject: RV-List: 2010 List of Contributors Dear Listers, The 2010 Matronics Email List and Forum Fund Raiser officially ended a couple of weeks ago and its time that I publish this year's List of Contributors. Its the people on this list that directly make the Email Lists and Forums possible. Their generous contributions keep the servers and Internet connection up and running. You can still show your support this year and pick up a great gift at the same time. The Contribution Web Site is fast, easy, and secure: http://www.matronics.com/contribution Or, by dropping a personal check in the mail to: Matt Dralle / Matronics 581 Jeannie Way Livermore CA 94550 I also want to thank Bob, Jon, and Andy for their generous support through the supply of great gifts this year!! These guys have some great products and I encourage you to visit their respective web sites: Bob Nucklolls - AeroElectric - www.aeroelectric.com Jon Croke - HomebuiltHELP - www.homebuilthelp.com Andy Gold - The Builder's Bookstore - www.buildersbooks.com And finally, I'm proud to present The 2010 Fund Raiser List of Contributors: http://www.matronics.com/loc/2010.html Thanks again to everyone that made a Contribution this year!! Matt Dralle Matronics Email List and Forum Administrator ________________________________ Message 2 _____________________________________ Time: 12:34:14 PM PST US Subject: RV-List: typical peak EGT ? From: thomas sargent I have an Lyc. IO-360-B2B from Aerosport on my 6A. It has about 23 hours on it now and after talking to Bart, he says it can be considered broken in. So I started experimenting with leaning it. I had been keeping the exhaust gas temps below 1300 F. (I have a VM1000 so I have EGT and CHT on each cylinder.) I should mention I've never done this before - this is the only plane I've flown with all these temp. probes. At 6500 ft and 2400 rpm I started leaning it out a quarter of a turn at a time and then wait 30 seconds or so watching the exhaust gas temp and cyl. head temp. The exhaust gas temp responds quickly. By the time I was at about EGT 1430 F and CHT 395 F with the fuel flow down to around 7.5gph, the engine started missing. The more I leaned the more it missed, so it must have been in the too-lean range at that point. I never saw the temperature peak. Admittedly, was kind of hard to tell with the vm1000 displaying a different probe every second. I guess I should pick one EGT probe and watch that, but I was expecting a more pronounced peak. (I wasn't using the vm1000 "leaning mode" display.) >From what I read in the Lycoming manual, I was expecting to see peak temperatures well over 1500 F. I have the Vetterman exhaust and I placed the e.g.t. probes right where Larry V. said to put them. Larry does a lot of experimenting and I'm pretty sure that he has found the optimal place to measure e.g.t. What are typical peak EGT temperatures for this engine? -- Tom Sargent, RV-6A ________________________________ Message 3 _____________________________________ Time: 01:00:06 PM PST US From: "Ralph E. Capen" Subject: Re: RV-List: typical peak EGT ? I have some graphs of when I did the injector balancing exercise in my 6A. Aerosport IO360B1F6 with LASAR, 9.2:1 pistons, AFP injection, vetterman exhaust, SJ cowl/plenum. I put mine where Larry said also. I think my numbers would be pretty close to what you should get. I don't remember off the top of my head what they were though......The altitude/RPM you were at is where I did mine too - although I had my MP @ 24" too. Just under 8 gph is where mine started peaking. The goal is to get them all to peak at the same fuel flow rate - you probably won't be able to get the to peak at the same temp. After a couple of runs I was able to narrow down my injector sizing and finally get it right. I'll dig out my graphs and send them to you directly. -----Original Message----- >From: thomas sargent >Sent: Dec 14, 2010 3:28 PM >To: rv-list >Subject: RV-List: typical peak EGT ? > >I have an Lyc. IO-360-B2B from Aerosport on my 6A. It has about 23 hours on >it now and after talking to Bart, he says it can be considered broken in. >So I started experimenting with leaning it. I had been keeping the exhaust >gas temps below 1300 F. (I have a VM1000 so I have EGT and CHT on each >cylinder.) I should mention I've never done this before - this is the only >plane I've flown with all these temp. probes. > >At 6500 ft and 2400 rpm I started leaning it out a quarter of a turn at a >time and then wait 30 seconds or so watching the exhaust gas temp and cyl. >head temp. The exhaust gas temp responds quickly. By the time I was at >about EGT 1430 F and CHT 395 F with the fuel flow down to around 7.5gph, the >engine started missing. The more I leaned the more it missed, so it must >have been in the too-lean range at that point. I never saw the temperature >peak. Admittedly, was kind of hard to tell with the vm1000 displaying a >different probe every second. I guess I should pick one EGT probe and watch >that, but I was expecting a more pronounced peak. (I wasn't using the >vm1000 "leaning mode" display.) > >>From what I read in the Lycoming manual, I was expecting to see peak >temperatures well over 1500 F. I have the Vetterman exhaust and I placed >the e.g.t. probes right where Larry V. said to put them. Larry does a lot >of experimenting and I'm pretty sure that he has found the optimal place to >measure e.g.t. > >What are typical peak EGT temperatures for this engine? > > >-- >Tom Sargent, RV-6A ________________________________ Message 4 _____________________________________ Time: 04:41:14 PM PST US Subject: Re: RV-List: typical peak EGT ? From: Larry Bowen I just read about this the other night: http://www.sportaviationonline.org/sportaviation/201010?folio=85 Absolute EGT values are next to worthless. Relative values are whats important. -- Larry Bowen Larry@BowenAero.com http://BowenAero.com On Tue, Dec 14, 2010 at 3:56 PM, Ralph E. Capen wrote: > > I have some graphs of when I did the injector balancing exercise in my 6A. > > Aerosport IO360B1F6 with LASAR, 9.2:1 pistons, AFP injection, vetterman > exhaust, SJ cowl/plenum. I put mine where Larry said also. > > I think my numbers would be pretty close to what you should get. I don't > remember off the top of my head what they were though......The altitude/RPM > you were at is where I did mine too - although I had my MP @ 24" too. Just > under 8 gph is where mine started peaking. The goal is to get them all to > peak at the same fuel flow rate - you probably won't be able to get the to > peak at the same temp. After a couple of runs I was able to narrow down my > injector sizing and finally get it right. > > I'll dig out my graphs and send them to you directly. > > > -----Original Message----- > >From: thomas sargent > >Sent: Dec 14, 2010 3:28 PM > >To: rv-list > >Subject: RV-List: typical peak EGT ? > > > >I have an Lyc. IO-360-B2B from Aerosport on my 6A. It has about 23 hours > on > >it now and after talking to Bart, he says it can be considered broken in. > >So I started experimenting with leaning it. I had been keeping the exhaust > >gas temps below 1300 F. (I have a VM1000 so I have EGT and CHT on each > >cylinder.) I should mention I've never done this before - this is the > only > >plane I've flown with all these temp. probes. > > > >At 6500 ft and 2400 rpm I started leaning it out a quarter of a turn at a > >time and then wait 30 seconds or so watching the exhaust gas temp and cyl. > >head temp. The exhaust gas temp responds quickly. By the time I was at > >about EGT 1430 F and CHT 395 F with the fuel flow down to around 7.5gph, > the > >engine started missing. The more I leaned the more it missed, so it must > >have been in the too-lean range at that point. I never saw the > temperature > >peak. Admittedly, was kind of hard to tell with the vm1000 displaying a > >different probe every second. I guess I should pick one EGT probe and > watch > >that, but I was expecting a more pronounced peak. (I wasn't using the > >vm1000 "leaning mode" display.) > > > >>From what I read in the Lycoming manual, I was expecting to see peak > >temperatures well over 1500 F. I have the Vetterman exhaust and I placed > >the e.g.t. probes right where Larry V. said to put them. Larry does a lot > >of experimenting and I'm pretty sure that he has found the optimal place > to > >measure e.g.t. > > > >What are typical peak EGT temperatures for this engine? > > > > > >-- > >Tom Sargent, RV-6A > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv-list Browse Digests http://www.matronics.com/digest/rv-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.