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<< Lancair Builders' Mail List >>
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Here is what the data shows. At .75 X 350 Hp and operating the engine 50
to 125F rich of peak, the peak internal cylinder pressures will be 10 to 15%
higher than the same engine operated at the same 0.75x350Hp with the engine
leaned and operating 60 to 90F LOP. AND, operating ROP, the CHTs will be
about 30-40F hotter than when LOP at the same horsepower. I have a 100
dollar bill for anybody that can show me any data that is materially
inconsistent with what I just wrote.<<
I'm afraid I can't get your $100 as I think you are essentially right. But,
you say the peak PRESSURES are 10% lower at LOP operation and at the same
power setting. Are you taking into account that the manifold pressure will
be higher running LOP? I would think that the peak pressure will be close
at the same power setting except for the fact that the timing is fixed and
the flame speed is slower LOP. I don't think that would be enough to lower
the pressure by 10%. As I recall, 50 LOP will be down at least 5% in power,
so the MAP will have to be more than 1" higher to get the same power.
Gary Casey
LML website: http://members.olsusa.com/mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please remember that purchases from the Builders' Bookstore
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Please send your photos and drawings to marvkaye@olsusa.com.
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