"Say what you will, a well tuned Lycoming will give a BSFC of .375.
That's about as good as it gets for any four-stroke gasoline engine.

There

is just no truth to the "Lycosaur" paradigm."

My reaction is "in your dreams".  But then I'm prejudiced. (Probably

not the

only one on this list).  Anybody ever hear of a BSFC like this on a

Lyc

4-cylinder?

Al Gietzen

No way. Particularly as Lycoming does not allow running lean of peak.
Too hard on their precious $250 each sodium cooled exhaust valves.

More like 0.45. 0.375 BSFC is turbo compound country.
Paul Lamar

Perhaps Lycoming does not recommend it (yet, just wait till the next oil
crisis), but lots are running LOP on the IO360s used where I come from,
esp on the turbo normalized types. Try www.gami.com for more info. You
just need well calibrated fuel injectors......for your intake system.
The temps and pressures drop LOP...
Marc Wiese

Lets get one thing straight. Fuel injection does nothing for the BSFC or the
HP an engine will generate. Particularly with the same intake manifold
the single carb version uses. Only if the manifold is designed for fuel
injection with long equal length separate runners tuned for best BMEP 
(torque) at a certain RPM will you see a HP increase and a slight improvement
in BSFC. There will be no improvement over carbs with separate venturi 
for each runner. No way can you improve the thermodynamic efficiency of an engine
by matching the fuel flow to each cylinder. It does not change the average
mixture for a given HP. The reason gami can make wild ass claims and get away 
with it is because things like BSFC are too hard to measure with out the 
controlled conditions of a dyno.

If you run your Lycoming lean of peak the warrantee is void and you risk
burning the very expensive $250+ each sodium cooled exhaust valves. 

The price of aviation fuel will not change the physics of exhaust
valves.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org