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<< Lancair Builders' Mail List >>
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It is coming around again. The ROP vs. LOP.
For those who would brand me a uninformed,
inexperienced, heavy-handed operator of my engine, let
me give you an outline of ancient experience, and and
recent experience.
I have many, many, thousands of hours operating the
Pratt & Whitney 4360 as a flight engineer on the C-124
over the North Atlantic in the winter below 10,000 ft
and in Africa over the Sahara in the summer. Also, on
3350's on DC-6 and 7's around the US. Yes, we operated
these airplanes LOP. But we put a gallon of the oil an
hour (or more) into the upper cylinder through valve
guides and piston rings.
I see the major problem in the Continental is a upper
cylinder lubricant shortfall when running LOP. Early
ones especially. Have you considered why we still
operate with low lead fuel? Lead lubricates valve guides.
I think if you are a burning a quart every two or three
hours, equally distributed amongst all cylinders, you
can run at LOP, and have enough lubricant for upper
cylinder piston rings and valve guides. The valve
guides are seldom mentioned, but they are a problem.
I maintain that if you are running lean of peak, you
need upper cylinder lubricant added in the form of
Marvel Mystery Oil added to the fuel. Additionally, my
engine will not run smooth LOP above 29" @ 2400RPM. By
the way I have GAMI injectors. And Iridium plugs. (No
help)
Last fall I was forced into a engine overhaul, thanks to
a cracked crankcase. I had approximately 800 on my Top
Care cylinders. I had been experimenting with LOP and
my valve guides were worn to the point of needing
replacement and overhaul. I replaced the cylinders,
and swore I would take my own advice. So Far so Good.
So I have two factors. Smoothness and Lubricant. I can
add the Marvel, But how do I get it smooth? I would love
to burn 18 GPH and have cooler temps. BUT the price is
too high. New Cyls at 800 hrs.
One factor that should be taken into account in John
Deakin's article "Those Fire Breathing Dragon's", he is
not using our engine (TSIO-550). Some of the GAMI
charts were with a normally aspirated engine!! An
article about Turbo'ed engines- and using NON-turbo
engine charts. Go Figure.
Charlie K.
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