Getting facts straight! (3/3)

[Tom Parker]

Greg Hermann <bearbvd at cmn.net> wrote:

>So--what are we left with that is magical about stoich? The facts that a
>stoich mixture is the point where a three way catalyst works best for
>cleaning up tailpipe emissions and that it is also the point where a
>standard EGO or HEGO exhaust oxygen sensor (as opposed to a UEGO WBO2
>sensor) switches its output. Period.

So do the EGO sensors work at stoich because they were designed to work at
this ratio, or is there something intrinsic about their operation and the
conditions at stoich that causes this?

I guess the OEM's wouldn't be using them if they didn't work at stoich, so it
doesn't really matter if it is easy to make them this way or not. A better
question would be are they cheaper than the wide band sensors because they are
easy to make, or because they are used on so many cars?

--
Tom Parker - parkert at ihug.co.nz
           - http://www.geocities.com/MotorCity/Track/8381/