From: Gary Casey <casey.gary@yahoo.com>
Date: December 20, 2009 7:34:34 PM EST
Subject: Re: io-550 vs. tsio-550 differences?

Gary,

Some comments.
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The TN IO-550N engine that Tornado Alley delivers to Cirrus will produce horsepower at 0.38 to 0.39 BHp/lb-fuel/hr across an altitude and power range that spans anywhere from sea level to 29000 feet and do so at 200 Hp or at 310 Hp, or anywhere in between. [The real world numbers for the Thielert diesel was about 0.36 to 0.37 BHP/lb-fuel/hr.] There is no other general aviation engine installed in any fleet of aircraft that works anywhere near that well across that broad range of operating  requirements and environment.
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Regards,  George