Note that the distance from the inner surface is critical.  In this

highest

flux area it would not be uncommon to see 200+ degrees temperature drop
across the distance from the combustion chamber to the water jecket.

Thus

a deeper drill might read 500F while a shallow drill would only read 300

in

the same location where the difference between shallow and deep is only

.5"

Jeff Spitzer

Everything I have seen so far Jeff the gradient is not that high in the
aluminum. Most of the gradient is between the combustion chamber and the
steel trochoid wall and then between the aluminum and the coolant. Both

Taylor

and a couple of other sources have these references.

Drill down until you get steel and stop.

Paul Lamar

Tracy Crook wrote:

Careful!  That steel is only .040" thick!

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

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