Hi Jeff,
Up until this year, all turbocharged Cirrus were turbo-normalized
IO550N's with 8.5:1 pistons. Tornado Alley Turbos owns the STC for the
TN-IO550 that was used by Cirrus. Just this year, they started
offering TCM's TSIO-550 as an option.
Ron



On Mon, Sep 13, 2010 at 3:01 PM,  <vtailjeff@aol.com> wrote:
> An turbo charged engine that loses upper deck is NOT a naturally aspirated
> engine. A turbocharged TSIO 550 develops 100% takeoff power at 38.5 inches
> and 2700 RPM. If you lose a hose coupling at sea level the most you might
> get out of this engine is 29 inches-- making a go around rather interesting.
>
> engiengine just becomes a naturally
> aspirated IO550.
>
> Jeff
>