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Message
Todd & Rusty, my temps don't go below
135F in a long descent but of course this is in Florida. Could be a
different story in colder climate. I would not expect the engine to
run rough even if it got down to 115F though. The new dual map in the
latest EC2 software (as Rusty has) should eliminate this. I am flying the
prototype EM2 and the 4 unused CHT inputs are very handy for measuring temps at
various places. For instance, I wondered what the return water temp was
(after the rads) so I hose clamped a CHT thermocouple to the waterpump
inlet. No pain, no fabrication or holes to drill & tap.
Best place to check for coolant circulation failure
is the knock sensor boss just above the sparkplug (if you have them). A
CHT probe works great here too.
I know, I know, when is the EM2 going to be
ready..... Real Soon Now. When the list of things to tweak I
make during every flight is down to zero, it will be done. Making final
selection of optical display filter this week.
Tracy
Tonight, while descending from 9500'
I kept the controller bypassed allowing the pump to flow at full speed. I
found that it cooled off so that the hot coolant out of the engine was below
the bottom scale of the gauge (<50C) and coolant press was 0psi. Then
when I entered the circuit and applied power, it ran rough until it
warmed up a bit.
Interesting. Hey Ed, Tracy, Bill (?), anyone else
without a thermostat- what sort of temps do you guys see when making a long
low power descent?
Also, where is your pressure sensor Todd? It
must be after the engine, and before the pump. I will probably try to
put a sensor somewhere downstream of the pump, so I can see that it's
producing flow/pressure.
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