O2 Sensor

[CSH-HQ]

>An O2 sensor in the collector wouldn't read the average, it would read lean
>until the leanest cylinder became rich.

Unless SEFI, they all should be about the same mixture, or at least the 
injectors are fired in batches, it will read lean until the next cylinder 
fires, and then might be richer, or leaner.  It will gather the info for 
averageing, at low speed, but at high speeds, it does average since there is 
some lag time in it's response.
  If the  O2 sensor was any good at finding individual cylinders (mixtures), 
then why did gm go to crankshaft accleration rates for miss detection?.
Grumpy

  Which is what you need in order to
>make the reducing part of the cat work.  Then add air downstream to oxidize.
>
>Gary Derian <gderian at oh.verio.com>
>
>
>> Unless running one per cylinder, I wouldn't see the need to do that.  Most
>> applications seem to average a min of 9", and several go to like 4'.  I'd
>> personally go farther, and use a heated one.  Mostly do to the fact there
>> ain't no temperature compensation, so why put it where it is most
>> restrictive.  Also, would rather use a good average reading, rather than
>> favoring one or two.
>> Grumpy
>
>