To: Rotary motors in aircraft
Subject: [FlyRotary] Re: coolant / thermostat

  Also I also drill a weeper hole like Tommy James mentioned however I
only drill a 1/8 inch, I found it helps keep air pockets out and I
like keeping a wee bit of water flowing to help keep the radiator
from freezing when descending in cold weather.

  Ken Welter

>>>>Definitely put a weeper hole in the thermostat.  Apparently the
stock Mazda thermostats have a 'jiggle pin' in a hole to allow bleeding
of air.  I have an aftermarket thermostat that has no hole, and it
caused a lot of difficulty getting the coolant in and the air out for
the dyno run.  Finally just took it out, did all our runs, and then got
a different thermostat with a 'jiggle pin' for the runs to measure flow
with the thermostat.

Al