From EAA's Sport Aviation august 2011: They use a Curtiss-Wright R-3350-95W engine with the R-3350-26WD (from the Douglas Skyraider) blower along with a few other parts. The 28 cylinder engines cost $150,000 each. They are expecting about 2000 between overhauls instead of the few hundred hours between failures that the previous engines gave. The new engines are carbureted, run cooler, and produce about 1,000 more hp than the previous engines.