Ed Anderson wrote:

I have a friend that has a 13B in a GlasStar who is just beginning his
flight test phase and guess-what?  He has cooling problems, I know - hard to
imagine, but its true {:>).  Seriously, his oil and coolant temps are
running too high.  There does not to appear to be any readily apparent flaw
in his cooling set up, however, he is using smaller lines for his coolant
system and I wanted to check and see if anyone else is using this size hose
and what your results were.

His radiators are the GM Evaporator cores plumbed in series with AN-12
fitting and hose.  His oil cooler is the stock mazda oil cooler using AN-10
fittings and hose.  He also uses the stock Mazda 13B thermostat (that plugs
the 1/2" hole in the water pump).  Temperatues climb as high as 240F on the
oil and 220F on the coolant measured at oil inlet and water pump thermostat
housing.

I attempted to use AN-12 lines on a similar set up unsucessfuly , however, I
also attempted to use thin oil cooler exhangers as the radiator so was never
certain whether it was the -12 hose or the oil coolers.  Anyone else using
AN-12 hose?

Except for the use of a thermostat and smaller AN-12 lines, his basic set up
is similar to the one that  I, Tracy Crook,  Jim Mosur and others have used
successfully for cooling system.  So I suspect perhaps his airflow could be
the culprit or the smaller hose or both..

His air opening for his oil cooler appeared to be a mite on the small side
(5"x2") and he is going to open it up to 10" or so.  Any other ideas?
Suggestions?

Thanks

Ed Anderson

First my congratulations to him on getting another rotary in the air.

Can you or he take some digital  pictures?

Sounds a bit like an  inlet duct problem.

Is he using the traditional cowl flap outlet on the bottom of the cowl.

He should try plugging the bypass in the pump and taking out the
thermostat.

Is he using an IVO prop?

Paul Lamar

Jeff Spitzer wrote:

What!!!  -12 is much too small for all lines in series.  I'm amazed Tracy
gets away with his small lines but he's running in parallel.  I'd fix the
hoses first before messing with the airflow.  Maybe both will be needed.

Jeff Spitzer

 
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