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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA
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 Posted: Tue Jul 22, 2008 8:38 am Post subject: Superior vs. Lycoming; XP-400 vs. IO-390 |
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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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MONTY(at)bpaengines.com
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| Posted: Tue Jul 22, 2008 8:48 am Post subject: Superior vs. Lycoming; XP-400 vs. IO-390 |
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BPE has dyno tested the XP-400 engine.
Monty Barrett
BPE, Inc.
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA
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| Posted: Tue Jul 22, 2008 9:03 am Post subject: Superior vs. Lycoming; XP-400 vs. IO-390 |
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Hi Monty,
Well, that's cool. Please share the results!
Matt
At 09:49 AM 7/22/2008 Tuesday, you wrote:
[quote]
BPE has dyno tested the XP-400 engine.
Monty Barrett
BPE, Inc.
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MONTY(at)bpaengines.com
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| Posted: Tue Jul 22, 2008 11:56 am Post subject: Superior vs. Lycoming; XP-400 vs. IO-390 |
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Matt,The data is proprietary and is not mine to share. The engine is
still here for further testing and development. All I can tell you
about it is that the HP is close, but not close enough. We ran a WOT-
RPM - BHP curve, a prop load curve, and a mixture sweep with 2 different
injection systems.
The bore and stroke is 5 1/4 X 4 5/8 respectively. The compression
ratio is
8.5:1. The engineer who was working on that with SAP is no longer
there.
MB
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gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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| Posted: Tue Jul 22, 2008 12:34 pm Post subject: Superior vs. Lycoming; XP-400 vs. IO-390 |
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The SAP site specs now show 220hp but at 8.7/1. Would that close the "not close enough" gap?
Greg
Sent via BlackBerry from T-Mobile
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