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Ed, What is you normal EGT readings at cruise rich and what is peak lean? Thanks...Roger ----- Original Message ----- From: "Ed Burkhead" <[EMAIL PROTECTED]> To: "Coupe-Tech" <[email protected]> Sent: Wednesday, February 11, 2004 1:55 PM Subject: RE: [COUPERS-TECH] C85, Stromberg, Lean Idle problem > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > > Chuck wrote: > > I am under the impression (perhaps in error) that the Stromberg > > carb must be 'wired' in the full rich position by "AD". > > Chuck > > Naw, that's B.S. that floats up around the airport from time to time, > spouted by the ignorant. No such thing came up on the AD searches by > any of the SEVERAL GOOD mechanics I used over the years. > > Stomberg's lean just fine. As I mentioned, the response seemed much > slower to me than the leaning in other carbs. Make small, slow > adjustments and watch your high accuracy EGT and you'll see that you can > easily control it to any 10° spot you want. I could easily set it to > 50° rich of peak for cruise and 100° rich of peak for max high-altitude > power. > > > High, thin-air cruising isn't for everyone. I suppose, for anyone out > West, it's a regular part of flying. > > With leaning, you can more easily go high for long-distance cruises and > make your Coupe a MUCH better traveling machine. I could, for example, > plan to fly high, slow down to 75 indicated (93 true), leaned, at 3.5 > gph. That would give me fuel burn of one hour to climb at 5.5 gph, and > 31/2 hours at 93 mph. That's 4.5 hours averaging around 90 mph for 405 > miles with a 6 gal. reserve. It IS NECESSARY to avoid drinking liquids > before takeoff, through the flight till starting the letdown to > comfortably manage this range. > > When you figure that a fuel stop takes about an hour to fly the pattern, > land, taxi, de-water, fill the tanks, pay, take-off and get on course, > any fuel stop you can avoid is a BIG increase in your average cruise > speed. Sometimes, depending on prevailing winds, weather and trip > length, it's worth doing. > > By the way, the air up high is almost ALWAYS as smooth as glass. > > Ed Burkhead > http://edburkhead.com/ > [EMAIL PROTECTED] (remove the QQQ) > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > Sent: Wednesday, February 11, 2004 11:25 AM > To: Ed Burkhead > Cc: roger anderson; Coupe-Tech > Subject: RE: [COUPERS-TECH] C85, Stromberg, Lean Idle problem > > I am under the impression (perhaps in error) that the Stromberg carb > must be > 'wired' in the full rich position by "AD". Can you correct me on this? > My > home airport is Sunriver, OR @ 4158 AGL! > > Chuck Rosenfeld > N3773H > > > Quoting Ed Burkhead <[EMAIL PROTECTED]>: > > > ----[Please read http://ercoupers.com/disclaimer.htm before following > any > > advice in this forum.]---- > > > > > > > > Roger, > > > > I had a similar rough engine in flight after I descended from 10,500' > > one day to 2,000.' Pulling the carb heat made it run smoother and > full > > power was also smoother than lower power. It seemed like the engine > was > > running excessively lean. I was worried about detonation damage. > > However, I was only 5 miles from the airport by this time so I > continued > > to the airport with carb heat on. > > > > My favorite mechanic was at the destination airport so he pulled the > > carb. He found the internal tube from the venture to the mixture > > control system had become plugged with fibers from the recently > cleaned > > air filter. (I never used the fiber-based air filters again!) > > > > We cleaned the carb tubes, cleaned the mixture control assembly, > > stropped the moving plate against the non-moving plate, re-cleaned it > > all, assembled the carb, removed the wired-full-rich safety wire and > > tested operation of the push-pull control. > > > > >From then on, I was able to lean my engine and get great long-range > and > > low fuel burn on cross-country trips when I wanted to. It probably > > helped my high-altitude operation when I flew out west a few years > > later. Be aware that the Stromburg carb leans just fine but you have > to > > move the control slowly and watch the sensitive EGT. *I* think that > the > > Stromburg mixture changes somewhat slowly, NOT instantly, but it does > > work accurately and reliably. > > > > I did find that I could not personally hear the engine roughness with > > adequate reliability on the C-85 in my Coupe. I got a high accuracy > K&S > > EGT and was happy forevermore. > > > > If you haven't done so, you might want to have those internal tubes > > checked in the carb. It took about 2 to 21/2 hours of labor for all > this > > on my plane. > > > > Ed Burkhead > > http://edburkhead.com/ > > [EMAIL PROTECTED] (remove the QQQ) > > > > -----Original Message----- > > From: roger anderson [mailto:[EMAIL PROTECTED] > > Sent: Monday, February 09, 2004 9:10 PM > > To: [email protected]; [EMAIL PROTECTED] > > Subject: [COUPERS-TECH] C85, Stromberg, Lean Idle problem > > > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following > > any advice in this forum.]---- > > > > > > A C85 and a Stromberg. At idle and lower rpms, very rough, won't take > > throttle, coughs, backfires. However, pull out carb heat and runs > good. > > Mag check at 1700 rpm will frequently be rough, large drop, misfiring. > > Pull out carb heat, smooth. Runs good at higher rpms. Have pulled > carb > > off, checked mixture housing, cleaned plates under, wired full rich > now. > > Float level correct. Cleaned and blew out everything. Checked all > > hoses, clamps, etc for vacuum leak. Everything tight. Idle mixture > > screw out to almost 3 turns now. By the carb heat correcting the > issue, > > it sure indicates a lean mixture idle circuit problem. Any thoughts > or > > other suggestions? Thanks ...Roger > > > > > ======================================================================== > > ====== > > To leave this forum go to: http://ercoupers.com/lists.htm > > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > > > > > > > > ======================================================================== > ====== > > To leave this forum go to: http://ercoupers.com/lists.htm > > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > > > > > > > ========================================================================== == == > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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