The high temps are indicating
insufficient cooling capacity ( I guess that’s obvious); which means
insufficient air flow or too little heat exchange area. If others are
getting adequate cooling at the same power with the same cores, then it is air
flow. As I recall, you are no longer running the coolers in series, but
there still may be a pressure recovery issue with your scoop, or just too
small an opening; more like the first.
After a few runs it seems that
the air should be purged. Do you have a means of checking (confirming
your temps to be sure there isn’t some boiling going on?
Al
Subject: [FlyRotary] Still high
temperature
I
would appreciate input to a problem that I have. I just overhauled
the
engine, and reworked the cooling system. I'm now
using the A/C evaporator
cores for radiators. The problem I'm having is,
that when I take it up, I'm
seeing coolant and oil temperature of about 210
degrees. That is climbing
to pattern, leveling off, and throttling back to low
power. The oil stays
pretty much where it is, and the coolant come down
just a couple of degrees.
When throttle back to land, the coolant and oil both
come down to about 180
at touchdown. I taxi back to the hanger and shut
down with oil and coolant
about 190-195, but after shut down, I get all sorts of
gurgling noises from
the header tank, which is fed by the tap on the side
of the thermostat
housing. The gurgling noises go on for 5-6
minutes, which would seem like
the engine is overheated, but while hot, it doesn't
seem overly hot. The
other end of the header tank feeds coolant to the
turbo, so maybe the hot
water is coming from it ? Maybe my header tank should
be fed differently ?
Also at this time, after a short flight, there is only
a couple of cups of
additional coolant in the overflow
tank.
I
assume that the higher than desired coolant temperature, and the
gurgling
noise are related. I pulled the water pump off
today to double check it,
and all seems OK. The pump only has about 10
hours on it. When I run it on
the ground, and feel the radiators after shutdown,
they are uniformly hot.
I
put a furnace blower pointed at the scoop, and I'm getting very
even
airflow through the radiators. The oil cooler,
on the other hand, has about
75% of the air going through the middle of the cooler,
so I'm going to have
to add some deflectors in the plenum to push more air
to the outside. That
seems to be a less significant issue at the
present.
Any thoughts ?
Steve Brooks
Cozy MKIV
Turbo rotary
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