RV-List Digest Archive

Wed 12/15/10


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 06:27 AM - Re: typical peak EGT ? (Richard Martin)
     2. 06:31 AM - Re: typical peak EGT ? (cheathco)
 
 
 


Message 1


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    Time: 06:27:28 AM PST US
    Subject: Re: typical peak EGT ?
    From: Richard Martin <martinaerodrome@gmail.com>
    I have been opperating both the IO-360 and now the IO390 in my rv8 for the last ten years and found that the operating temps are the same in each engine. I find that the CHT should operate in the 360 range not to exceed 400. The EGT should operate in the 1400 to 1440. range. Another method is to lean until the engine peaks and then enrich until temps reduce 100 degrees. This is general proceedure, you will have to tweak it to reach optimum performance with your airplane/engine combination. Note, you will note small variation from winter (0 degrees in Wisconsin) to summer temps 60 to 90 degrees. Dick Martin RV8 N233m the fast one On Tue, Dec 14, 2010 at 2:28 PM, thomas sargent <sarg314@gmail.com> wrote: > 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 brokeDickn > 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 2


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    Time: 06:31:38 AM PST US
    From: "cheathco" <cheathco@cox.net>
    Subject: Re: typical peak EGT ?
    When the engine starts missing you have leaned too much. Im old school, still lean the way we did it for umteen years. lean till starts t miss, push in 1/4 inch and your done. My last engine went 2340 hrs with that proceedure, still running like a top when I pulled it. Charles H




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