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The oxygen sensor is basically a mixture sensor. If you hook up a voltmeter to it:
Above 0.7 volts: Rich
Below 0.7 volts: Lean
(the 0.7 is approximate).
In theory, if you had an oxygen sensor in each exhaust header, you could do without the EGT sensors.
EGT: Exhaust Gas Temperature.
Oxygen sensors get contanimated by the lead in leaded gas and start responding slower and slower.
Thus many of us have one oxygen sensor located somewhere after the two exhaust headers are joined into the exhaust pipe (showing average mixture of the two rotors), and two EGT sensors: one in each exhaust header.
In theory if you have two identical EGT temperatures, the mixtures would be identical too.
EGT goes from low and rich mixture, peaks at best mixture and then drops as you lean the mixture past peak.
RPMs would peak at best mixture.
Engine uneveness will show when you've leaned way past peak (and probably also when way too rich).
So you could do without any oxygen and EGT sensors, but you wouldn't know if one rotor was running way leaner/richer than the other.
Obviously, placement of the two EGT sensors relative to the exhaust ports is critical to getting accurate (realtive) readings. How far doesn't really matter, from a couple of inches to maybe 6 or 12 ". You just want them to be at the same distance from the ports (unless you start to compare EGT temps to other peoples reported EGTs).
EGT temps drop rapidly the further you measure them from the exhaust port.
Finn
Marvin Kaye wrote:
Posted for "sqpilot@earthlink" <sqpilot@earthlink.net>:
RE: [FlyRotary] Re: Where to install EGT sensor?Err....I should probably have mentioned this, but I didn't because I don't understand the silly thing. I DO have an oxygen sensor in my manifold, and the ECU instructions said to hook the black wire to it. What will the oxygen sensor do for me (or not do), and is this something that can take the place of an EGT sensor? Inquiring minds want to know. Thanks for walking me through this....I am embarrased to admit I don't know very much about these items. Thanks for your all those who replied already. Paul Conner
Homepage: http://www.flyrotary.com/
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