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From: "Steve Brooks" <steve@tsisp.com>
To: "Fly Rotary \(E-mail\)" <flyrotary@lancaironline.net>
Subject: Still high temperature
Date: Sun, 19 Sep 2004 13:54:45 -0400
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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