This thread was going on thus:

"John Rodgers wrote:
...... has always seemed to me that some sort of EGT system f=
or  all four cylinders would be appropriate.

------------ reply -----------------------

Yeah, a probe in all four cylinders would be interesting.  I think EGT
is
more informative than cylinder head temp. "

From my kart racing days, the EGT is about a million times more useful
for engine tuning than the CHT.  The CHT tells you how hot the top of
your engine is...the EGT tells you how the combustion is doing.  This
was much more critical in the 2 cycle racing engines, but I bet you
could learn a lot on the Vanagon engines.  I like the aircraft
application.  Neat.

Bob
East Haddam, CT