"Paul Mennen" wrote in message
...
If an exhaust valve stuck partially open it would raise
your EGT and lower your CHT

That seems like a more likely explanation than the blocked
fuel injector. The reason I think so is that on the previous
annual the other to cylinders on that side (#3 and #5) were
removed to have their exhaust valves replaced and guides
repaired. (At only 300 hours! I guess Continental still hasn't
figured out how to make cylinders like the did in the 70's
and 80's). So if the same wear is happening on #1 it might
cause it to stick on occasion.

~Paul


But for that to happen here, the exhaust value must be stuck for quite a few
cycles. Assuming 2500 RPM for the duration of your 3 minute event and
dividing by 2 for the four-cycle engine means that your exhaust value chose
to stick 3750 consecutive times out of the 22,500,000 cycles it has executed
up to that point (300 hrs converted to valve cycles). I still like the
partially clogged injector that continued to bleed fuel into the cylinder
after the exhaust cycle started.


--
Jim Carter