----- Original Message -----
From: <13brv3@mchsi.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, May 19, 2003 10:22 AM
Subject: [FlyRotary] Re: coolant / thermostat


For those of you not also participating on the "other" list; attached is
the flow data measured during my 20B dyno run with (full open) and
without the thermostat.  Considerably higher flow without.  Higher flow
= better cooling.

Al
----------------

Thanks for passing that along Al.  BTW, nice looking numbers on the 20B.
Thanks also to Bill for passing along your experiences.  I'll be interested
to hear if the temps go back down without the thermostat.

 SNIP

Besides temp control, the other useful feature of the thermostat is to build
additional pressure in the block to raise the boiling point.  In our case,
we're running much higher pressure caps than the street engine, so we make
up for some of that.

Rusty

Rusty, you are probably already aware of this, but if you do fly without a
MAZDA RX-7 thermostat you will loose approx 20% of your cooling
effectiveness if you DON'T block the 1/2" hole (that is according to Racing
Beat's Technical data).  The Mazda RX-7 thermostat is unusal in that it has
a little "stopper" that extends and plugs the 1/2" hole when the
engine/coolant heats up and the main thermostat valve opens.  Most
thermostats, of course, do not have this feature.  So if using anything
other than the stock RX-7 thermostat (or not thermostat), you need to plug
the hole!

Ed

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