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I found
an article for Cirrus SR-22 owners suggesting that the take off
fuel flows on the IO-550N are set too low at the factory.
As I recall the Continental
fuel injection document calls for about 26 GPH full rich full throttle, 2700
RPM.
The Cirrus article
recommended a minimum of 28 GPH to help lower peak cylinder temperatures and
pressures. Climb full rich, and then do the "big pull" with the mixture
knob all the way into LOP territory. The table below shows how far to
pull as a function of power setting.
Lean of peak for the IO-550 N (8.5 compression ratio) horsepower is
15 times fuel flow in gallons per hour. This was the basis of the LOP flow
rates in the table above. I figure that with 10:1 compression which
produces about 4-5% more horsepower, the number is about 15.6 horsepower per
gallon per hour.
In my correspondence with a
GAMI rep, the suggestion was a take off fuel flow of 32 GPH when using 10:1
pistons.
What are you IO-550
operators getting for take off fuel flow?? What recommendations have you
heard or seen?
Fred
Moreno
Lancair IV, IO-550,
awaiting a new Hartzell prop
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