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Jonathan said,
Colyn,
The higher compression ratio engine would actually be expected to
have
higher CHTs, but lower EGTs and TITs. The reason for the
difference is just
as you say however. The greater expansion
factor takes waste heat out of
the exhaust and converts it to work, so
CHT is higher, EGT lower and brake
specific fuel consumption is
lower. The way to mitigate the higher CHTs is
to run the engine
LOP, and LOP operation will also yield the lowest bsfc.
I
believe the -N model number refers to the Continental engines with
tuned
induction.
Jonathan
Actually, it is somewhat counterintuitive but
CHT's come out lower too.
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