Steve,
If you'll accept a comment from someone who isn't flying (yet), I would like to make a suggestion.  My 3-rotor had the same symptoms (gurgling in the purge tank) upon shutdown.  My problem turned out to be a radiator supply line too close to the exhaust.  It was fine as long as the coolant was circulating.  As soon as I shut it down, the coolant would reach boiling point and it would spit and gurgle for about 5 minutes.  I would be suspicious of the coolant lines to your turbo. 

Mark S. 

 

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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