The one I have
isn't very big and was perfect for my installation. I now have the parts I
need to build a small digital indication so I'll start to work on that
tomorrow.
I'm interested to know if
the problem you fixed with the original pump was something that you think
was a flaw in that particular pump, or something that you think exists in all
of them.
I need to type up a report for Leon along with
drawings of my analysis. I will share them with the list. I checked the
new pump for that problem as well but it was fine. I installed the new pump
last night and when I arrived at the hangar this afternoon, I found a large
puddle of coolant under the plane. More than a litre had leaked out through
the shaft seal. *&%$!?, but before I removed it, I topped up the system
and ran it up to temp and press... no more leaks. The new seal just had to
seat properly, so all is well. I probably just disrupted the seating when I
disassembled for inspection. I find that the new pump flows a few litres/min
less than the old pump, but still more than sufficient for
cooling.
On the other
hand, there are lots of folks running with no thermostat, and during
descent, they will still be at a reasonable rpm to create a lot of flow with
the stock pump. If they aren't having problems, then I
shouldn't either.
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.
May I suggest that you plug
your thermal switch into the temp sensor location near the oil filter
pad? I figure that would be the first place to show high temps in the
combustion chamber if the water flow
stops.
I was thinking about this as I'm running out of
places to put coolant sensors. It got me wondering where others are taking
their coolant temp measurements. I take my temps at the adapter block
measuring temps in and out. It would seem to me that the temp at the rear
sensor fitting would be a little cooler as the coolant has only gone half way
through the engine. However as you imply, it may have already seen the hottest
parts.