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Professor Braly, where WOULD you be comfortable setting baseline timing on such an engine?
John Huft
Marvin Kaye wrote:
Posted for "George Braly" <gwbraly@gami.com>:
Craig,
Having done a full blown FAA type certificate block engine run one of these
engines - - - with internal combustion pressure sensors monitoring the
combustion pressures, I would not be comfortable with the timing set at 25d
BTDC for a 10:1 CR experimental version of the 8.7:1 Lycoming engine.
Regards, George
"""
I'm willing to bet at a 5 deg retard you are giving up power and fuel
economy. Unless you are detonation sensitive, I would expect no more than a 2
deg retard on a 27 deg baseline for a 10 to 1 CR motor. I would be happy with
the 3 deg shift.
"""
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