Jeff , et all, I just lastr weekend did this. I had installed a bung last spring when I built all stainless steel headers into each side and wired a probe from each side. I only wired in the switch this past weekend and have only one hour of flight time on the rig. The results are good so far but only confirm what I already knew from haveing 6 exhaust temps The readinigs are consistant and stable. The system is simple but I have to differ with Mr Langford in that I think that I could fly without it and have learned the exhaust temp trends well enough to fly with safety and economy to the point of lean of peak settings. My experience with the O2 sensor is on for 110 hours , 1 for 20 hours, 1 for 80 hours, 1 for 140 hours so far. Joe Horton, Coopersburg, Pa.
---------- Forwarded Message ---------- From: "Jeff Scott" <jscott.pi...@juno.com> To: kr...@mylist.net Subject: Re: KR> Re: Mixture Meter List-Post: krnet@list.krnet.org Date: Thu, 3 Sep 2009 17:56:56 GMT Thinking in terms of an installation on my O-200, I have 4 separate tuned length exhaust pipes. Knowing that the intake doesn't feed all cylinders evenly and that the mixtures vary significantly based on throttle setting, would a mixture meter require 4 separate probes, or 4 separate mixture meters? Are the guys running a mixture meter on their Corvairs with dual exhaust only measuring one side? I can see the mixture meters becoming very popular once 100LL goes away in favor of whatever unleaded aircraft fuel takes it's place. Pilots always lover having better accuracy. On a side note, sometimes running the perfect stoichiometric mixture in an air cooled engine isn't necessarily desirable. Aircraft carbs are designed to run a bit rich at full throttle and idle settings in order to use the excess fuel to help cool the cylinder heads. The assumption on the engine manufactures part is that full throttle is typically used during climb operations at lower speeds when the engine may not have sufficient cooling air, and idle operations are typically on the ground where the engine gets very little cooling air. Of course a mixture meter could be used to set or know exactly how much rich to run the mixture for that additional cooling under those circumstances. Jeff Scott Los Alamos, NM ---------- Original Message ---------- Larry, The mixture meter is a solid-state panel-mounted unit and should work for several thousand hours. The probe screws into a bung in the exhaust pipe. The bung is welded into the exhaust pipe; use stainless or 4130 bung depending on your pipe. Automotive applications for this same part number get about 1,000 hours before wearout using unleaded fuel. The lead in 100LL will gradually foul the sensor in about 100 hours rendering it inoperative. There is no practical way to clean the fouled sensor. At about $20 each, it's not a big deal to replace it. Better yet, run unleaded fuel and get a 1,000 hours operation. Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA smw...@md.metrocast.net _______________________________________ 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 ____________________________________________________________ Business School Earn Your Degree in Business. Apply to Top Business Schools Now. http://thirdpartyoffers.juno.com/TGL2141/c?cp=NTEQz3pxcm3xDhQ6mvyLhQAAJ1A9mk8a0luj1TJO2sh3zRLgAAQAAAAFAAAAAPLSTT4AAAAAAAAAAAAAAAAABzNiAAAAAA== _______________________________________ 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
