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Paul A. Franz, P.E.
Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA
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 Posted: Sat Aug 15, 2009 3:31 pm Post subject: best power, best economy |
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On Sat, August 15, 2009 3:10 pm, Tom Jones wrote:
| Quote: | For best power the instructions are to lean until maximum EGT is reached then richen
until EGT increases 25 degrees.
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How can you increase the EGT by 25 when you'e already set it to peak?
I believe best power is 100°F down from peak on the rich side and best economy is
approx 25°F down from peak on the rich side. Leaning from peak EGT is usually
accompanied with engine manufacturer's operating restrictions or is prohibited.
High power settings on lean side of peak EGT run the risk of overheating exhaust
valves and seats and burn damage. For that reason I would not be very comfortable
leaning from peak EGT.
--
Paul A. Franz
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
"When occasions present themselves, in which the interests of the
people are at variance with their inclinations, it is the duty of
the persons whom they have appointed to be the guardians of those
interests, to withstand the temporary delusion, in order to give
them time and opportunity for more cool and sedate reflection."
-- Alexander Hamilton, Federalist No. 71
"In addition to an abhorrence of democracy, and the recognition
that government posed the gravest threat to liberty, our founders
harbored a deep distrust and suspicion of Congress. This suspicion
and distrust is exemplified by the phraseology used throughout the
Constitution, particularly our Bill of Rights, containing phrases
such as Congress shall not: abridge, infringe, deny, disparage or
violate. Today's Americans think Congress has the constitutional
authority to do anything upon which they can get a majority vote.
We think whether a particular measure is a good idea or bad idea
should determine passage as opposed to whether that measure lies
within the enumerated powers granted Congress by the Constitution.
Unfortunately, for the future of our nation, Congress has
successfully exploited American constitutional ignorance or
contempt."
-- George Mason University economics professor Walter E. Williams
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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office |
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Sat Aug 15, 2009 4:27 pm Post subject: Re: best power, best economy |
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| Quote: |
Quote:
For best power the instructions are to lean until maximum EGT is reached then richen
until EGT increases 25 degrees.
How can you increase the EGT by 25 when you'e already set it to peak? |
Oops, thanks paul, I should have wrote: for best power lean to max EGT then richen until EGT decreases 25 degrees. I'll edit my post on that.
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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA |
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