Hey, George,
Here are some waveforms regarding the O2 sensor and engine
http://www.boschautoparts.com/OxygenSensors/Pages/PremiumOxygenSensors.aspx
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://www.dmack.net/mazda/index.html
http://www.flyrotary.com/
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.rotaryaviation.com/Rotorhead%20Truth.htm