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Superior vs. Lycoming; XP-400 vs. IO-390

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Matt Dralle
Site Admin

Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA

Posted: Tue Jul 22, 2008 8:38 am Post subject: Superior vs. Lycoming; XP-400 vs. IO-390

Dear Listers,



What is the common opinion of Superior XP engines vs. the typical Lycoming engine?



In looking over the Superior web site, they have a new 220hp XP-400 engine designed around the basic IO-360 Angle Valve chassis that looks pretty nice.  At $30,000 new, its $3-4k cheaper than the Lycoming IO-390 solutions and, if you believe the Superior mantra, a better designed engine in general.



What is the real-world quality and reliability of Superior-built engines?



Has anyone flown behind one of these new XP-400s?



Has anyone Dyno'd the XP-400 to prove the 220hp claim?



  XP-400 Information: http://www.xp-360.com/index.asp?content=14



  Avweb Article: http://www.avweb.com/news/motorhead/189629-1.html?type=pf



Thanks for your insight!



Matt Dralle

RV-8 # 82880

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