> Lynn wrote:
 > <
 > I don't fly a rotary but I run the hell out of one with a 160 degree Robert

 Shaw thermostat. I drill two 1/8" holes in the housing to be sure that air
 bubbles can escape on fill up. On hot days it runs 175 or 180 degrees. On
 cool days it runs below 160 degrees. With the thermostat closed, it can over
 cool through the two holes. Two years ago at the national championship race
 at Mid Ohio, the air temp was 51 degrees at the start of the race.
With 1/3rd
 of the radiator taped over, it didn't get above 150 degrees. The
oil temp was
 also 150.

 I have never seen a failed thermostat, and I have been looking for a long
 time. I have seen many people not get all of the air out of the system, and

 > suffer dearly for it.

Jerry Hey wrote:

Two observations: 

1) the rotary must not be particularly sensitive to

operating temperatures on the cold side.   

2) 51º is mildly cool, not

cold.  A winter's day in Minn. the air aloft might  be 30º below
zero.  --Jerry

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