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IO550 vs IO540

 
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Rbnew
Class G


Joined: 12 Feb 2013
Posts: 2

PostPosted: Wed Feb 13, 2013 10:34 am    Post subject: IO550 vs IO540 Reply with quote

Does anyone know, how Continental can get 310 hp out of their IO-550 while Lycoming can only get 260 hp out of IO-540?
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Spike
Chief Rivet Banger


Joined: 14 Oct 2004
Posts: 4008
Location (Optional): Baltimore, MD

PostPosted: Wed Feb 13, 2013 11:01 am    Post subject: Reply with quote

Lycomming can get 300HP out of a 540 and does so regularly. There are a whole fleet of aircraft that use 300HP lycoming 540's. Now, what you are noticing, is that some of the 540 line is derated for aircraft like 182's, TB20's, AC11, and the RB10. This is generally done via an RPM / manifold pressure reduction I believe.

This helps longevity and the maintaining of targeted power at altitude.

John
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captain_john
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Joined: 31 Oct 2004
Posts: 5617
Location (Optional): KPYM

PostPosted: Wed Feb 13, 2013 4:17 pm    Post subject: Reply with quote

Spike is pretty darned close, but let me add some details.

The 300 hp 540 I fly behind in the Cherokee Six is an Angle Valve 540. That is how they eek out the extra 40 ponies

It is kinda like the difference between the parallel valve 360 cranking out 180 hp and the angle valve 360 at 200 hp.

The angle valve engines weigh more but breathe better, hence more power.

Does this help?

Cool CJ
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Rbnew
Class G


Joined: 12 Feb 2013
Posts: 2

PostPosted: Wed Feb 13, 2013 9:29 pm    Post subject: Reply with quote

Yes... I see there are differences. Thanks for the explanation.
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captain_john
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Joined: 31 Oct 2004
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PostPosted: Thu Feb 14, 2013 9:46 pm    Post subject: Reply with quote

Soooo, ya thinking RV-10?

Confused CJ
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