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
>>
Homepage: http://www.flyrotary.com/
>>
Archive: http://lancaironline.net/lists/flyrotary/List.html