Jerry Hey wrote:

 I heard a new phrase (to me) in connection to the 13-B.  It is
THERMAL RUNAWAY.
 What it suggests is that there is an operating rpm and hp above which
 cooling the 13-B becomes increasingly  much more difficult. Given the
 space available for radiators in my Tailwind, this  sets the limit on
 how much power I can hope to generate. Question:  Is 170 hp at 5500
 rpm continuous a realistic goal? I have Tracy's ignition and fuel
 injection.    Jerry

Not at all Jerry. 170 HP is well within reason and easy to achieve.
I think the term "thermal runaway" is misapplied to any internal combustion
engine. Are you putting the rad in the aft fuselage?

Paul Lamar

Undecided. It would be nice to put the oil cooler up front under the
redrive, route the exhaust down under the engine and put the rads in
the fuselage.  jerry

 
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