o2 and EGT questions

[Harmon Sommer]

At the risk of driving _EFI'ers up the wall, I have a few more questions:


1. Do O2 sensors have a 'cusp' output where Vo decreases  as mixture
goes from lean to stoich, and then increases as mixture becomes rich? Or does it
have a generally positive (or negative) slope, with a characteristic
voltage at stoich?



              ^   \        /                  
              |    \      /                  
              Vo    \    /     Cusp 
                     \  /                    
		      \/              
				       
                <-Lean ----Rich->

                           /
                 ^        /
                 |       /
                 Vo   - -    Slope
                     /
                    / 
                   /


2. Who are vendors/where can info on O2 sensors be found?

3. What thermocouple materials are used for EGT probes? (Copper/Constantan
just don't sound right)

Thanks, Harmon