Every aircraft is designed an engine of choice. For the LancairIV, that engine is the Continental TSIO-550. With the "IV's" performance optimized for the flight levels, this twin turbocharged, twin intercooled engine delivers 75% power all the way up to 25,000 ft. where, depending on conditions, you'll be realising true airspeeds of 330 to 345mph .

For take-off, you'll experience the spectacular acceleration and climb performance of all the 350 horse up front which can quickly and safely get you above 90% of the weather.
This top of the line engine is equipped with a fully automatic turbo-wastegate control system - set your power level once, then sit back and enjoy the ride as manifold pressure remains the same throughout all altitudes.
 

The Reno race version of this aircraft was equipped with a twin-pump water injection system. Four months before the Reno Race, Continental dyno-tested and mapped the water injection into the race-version of the production TSIO-550 engine. Boost pressure has been risen to acieve new power level to fend off any new challengers at the coming Reno Air Race. Mr Eric Parlow, Senior Project Engineer at Teledyne Continental Motors has managed to increase the power output to 600+ at 3400rpm without sacrificing any Exhaust Gas Temperature increase. Safety and reliability of the race-engine is retained. There are several curves shown. The yellow is the stock production TSIO-550-E which this engine is based on. The purple curve is the target power we planned to achieve. The red is the maximum power the engine produced (more is possible but he needs to hold back something for next year!). The green curve is the power he is recommending for the race.