This is an excerpt from SDS's web site.

Who ever wrote this for SDS is smoking something he should'nt.
250 HP out of any 2.6 L (159 cubic inches) piston engine, even 
for only five minutes at a time, is a hand grenade that could 
explode at any minute.

Assuming that it really has 250 HP:
The car see's 250 HP for less than a second once or twice each time
it is accelerated at full throttle. 99.9% of the time it is generating 
less than 30 HP. No way is it comparable to a heavy duty 200 HP  IO-360
let alone an O-540.

As I stated over and over on here car piston engines
are light duty devices. 

The Mazda rotary is an exception for a car engine. I.E.
three moving parts, a bullet proof eccentric shaft, a cast
iron rotor, a steel lined combustion chamber and no valves 
to break or burn let alone camshafts and camshaft drive gears.

The projected TBO stated here  is dreaming. Riener Hoffman, one of 
the biggest fans of the Subaru dropped a valve and crashed in his 
experimental Subaru powered Cessna 150.

The Subaru makes a good 80-100 HP aircraft engine.

Paul Lamar

"Power vs. Weight vs. Manifold Pressure vs. Life vs. Cost

The EJ25 engine when turbocharged and equipped with a radiator, PSRU and
composite propeller is slightly heavier than the popular Lycoming and
Continental 360 cubic inch engines which are rated at around 200 hp for
takeoff and around 150 hp for maximum cruise. The Subaru can easily
attain
250 hp at 50 inches for takeoff and reliably deliver 175 to 200hp at
35-38 inches for cruise which puts it closer to the 540 cubic inch
aircraft engines
in performance. These power levels can be maintained during climb and
cruise at altitude thanks to turbocharging and liquid cooling.

Projected TBO is in the 1000-1200 hour range at this time. Most people
flying the EJ engines are confident that no interim work will be
required
during this period such as cylinder barrel replacement and valve
grinding operations which are quite common on aircraft engines before
reaching
their stated TBO. In other words, if you change the oil and check the
water, that is about all that is required during those 1000 hours. There
are no
magneto or even valve adjustments to worry about." 
 

 
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