o2 and EGT questions

[Steve=Ravet%Prj=Eng%PCPD=Hou at bangate.compaq.com]

Harmon Sommer <harmons at sequent.com> Wrote:
| 
| 
| 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?

I can answer this one...  Unlike most questions posed here... :-)

It looks like this:


                     /-----------------
                    /
                    |
                    |
                   /
------------------/

       rich       stoich       lean

It has a very steep slope at stoich, which is why they (typically) only read 
rich/lean, not how rich or how lean.


| 
| 
| 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
|