Forwarded: New guy - just testing

[Webb]

RABBITT_Andrew at mail.orbeng.com.au wrote:
> 
> because of short-circuiting during scavenging, the 2-stroke exhaust
> will have a way to high O2 level for an EGO to work.  You'll reach
> rich-misfire long before the sensor even thinks about switching rich.
> 
>

Yea, you're right. There is unburned mixture in the exhaust, sucked
there by the expansion chamber then rammed back into the cylinder just
before port closure by the reflected wave - if the tuned exhaust is
working correctly at this RPM. That'd probably confuse the hell out of
an O2 sensor alright!

I wonder if there is another way to close the loop? Testing EGT, or
sensing rich-misfire (using a modified knock sensor)then backing off...
sounds like a lot of work!