I recently converted from C-75 to 0-200 and had some concerns on proper EGT tempertures because of exhaust stack conditions. My exstacks has an alloy coating on them add ever since the 0-200 was installed and properly leaned(???) in flight I observed metal iciles hanging from the stacks.Not knowing what the temps. were I bought and had installed a JPI Modle 700 engine analizer in the coupe.A little expensive but well worth it.Once getting used to it I would go through the auto lean find procedure and realize that I came up with the same power settings as before but now I can moniter all engine temps.quite accuritly.My EGT's would range from 1400 to 1650 on a warm summer day crusing at 3000" and full power.My cyl. head temp. would range from 325 to 400.These EGT readings seem higher than those that you are reading. I wonder if this is because of the bigger engine or what.Had checked the mounting locations of the probes.Instructions call for 2 to 4 inches below the exh. flange. All probes are 3 inches below flange so I take these readings to be accurate. I also noticed that I have to prelean my engine by about 1 inch out on the mixture cable to get max. full throttle rpm's during ground run up.Full mixture cable travel is about 4 inches.Airport elv. is 1600'.Carb. is a M.S. which has the 1 peice venturi modification done to it.Just had annual done in Dec. and had mechanics go over the engine cowling seals with new cowling seals to make sure that I will get max. cooling and will compare my new readings in the summer.Today temp. was in the mid 30's and the hottest cly. at proper leaning was1500 at 7000 ft. and full power.Had new ASI ,VSI, and ALT. installed during anual an was checking out the cold weather performance. Really great, Initial climb rate at 1500 fpm steading at 1000 fpm till I leveled out at 7000 ft, IAS very close to GPS grouud speed while flying perpendicture to the wind(could determine this by smoke trails from power plant exh. stacks), and best ground speed indicated by my GPS was 160 mph.(Felt like I was flying a minature jet for a short time). Would like any comparative information on 0-200 conversions concerning EGT & CHT readings.JPI claims accurcy within 5 degrees. Going on vacation this week so I will not be able to answer any responces till I come back.
[EMAIL PROTECTED] wrote: > Claude, > > This is approximately the same response and numbers as on my > Alon's C-90. What I have read is that as long as you are > developing less than 60% power, it is virtually impossible > to hurt the engine with improper leaning. Check with the > Continental engine manual, but at 6000 feet I don't believe > you can develop more than 60%, unless it is extremely cold. > Therefore, it is possible to lean to peak EGT if the engine > runs smoothly enough and you are satisfied with the power > output. Theoretically, you will get peak power somewhere > around 50 to 150 degrees rich of peak, but I can't detect > much difference. > > What I do is take off full rich, lean to approximately 1250 > to 1300 as soon as I establish a cruise climb, then for > smooth operation just rich of peak during cruise. Due to > the carburetion and metering setup, the peak is very broad > at normal cruising altitudes, so I lean for smooth operation > then check EGT, CHT, and OIL temperature. At 9000 feet plus, > leaning becomes much more critical, but the EGT still is not > useful as the seat of the pants feel with a look at > temperatures to make sure everything is OK. > > David > N6359V > > [EMAIL PROTECTED] wrote: > > > > Hello all! > > I was wondering what would be considered a safe peak for the EGT with the > > engine still running smoothly. At about 6000 at cruise full rich mine is > > running around 1250 to 1300. I can leat to 1400 and get a 150rpm increase. > > >From 1400-1450 there is no change and higher it will lean and get rough. > So > > I target 1400 and leave it there. Is this too hot? With the 85 at 2150rpm > it > > drinks about 4.7 gph and I'm happy with that. > > --------------------------------- > to unsubscribe send mailto:[EMAIL PROTECTED] > > _____________________________________________________________ > Check out the new and improved Topica site! > http://www.topica.com/t/13 --------------------------------- to unsubscribe send mailto:[EMAIL PROTECTED] ________________________________________________________________________ Start an Email List For Free at Topica. http://www.topica.com/register
<<attachment: winmail.dat>>
