Bill Wrote:

I'd love to see a good dyno run to nail down the BSFC better for these
motors.

I have a friend who's 13b has run about 10 hours on the dyno and the

BSFC was

calculated.  I will ask him to post the information on this list.

Rino

As Paul pointed out, BSFC varies a lot with mixture ratio.  I would not be
surprised if my max power takeoff mixture setting gave something like .6
BSFC.  It is a lot better (.47 as close as I can estimate) at high altitude
cruise.  Unless the dyno run was made specifically with this measurement in
mind, dyno data is usually not helpful.  Usually, the dyno operator is
tuning for one thing - max power (regardless of fuel burn).  In a drag race
there is no credit given for fuel economy :-)   Let us know if there was an
effort made to tune for best BSFC on that dyno run Rino.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

 
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