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<< Lancair Builders' Mail List >>
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Hi George,
I thought Carl was being a bit conservative, on the other he hasn't crashed
yet causing insurance rates to go up..... <sorry>. I'm a 360 driver with an
IO360-B1F and have lately been practicing your recommendations for leaning,
including the 'big pull' you told Brent about awhile ago. It really works
well. I pull the mixture back until stumbling or power loss starts then I
richen for smoothness. Just like the simple carbureted airplanes I used to
fly. Doing this causes me to operate at about Peak. The CHTs drop well below
where they would be when I used to operate at 150 ROP. I add/subtract
manifold pressure to get the target fuel flow which relates to %power using
the Lycoming manual graphs for Best Economy which they stipulate as at Peak
EGT.
I used your downloaded data sheets and ran the test 3 times to examine my
cylinder spread. I got a consistent 0.5 gph spread with the cylinders 2 and
3 being the first ones to peak at about 8.2 gph. for the test settings.
Roughness would set in between 25 and 45 degrees lean of first cylinder to
peak depending on the test run. Unfortunately, the EGT resolution on the
Vision Microsystems VMS-1000 unit is only 8 degrees or there abouts (confirmed
with VM guy) so the data's not as smooth as I'd like.
My early temperature problems seem to have been most effectively reduced by 1:
operating at Peak or LOP and by 2: using unfiltered ram air on takeoff so
that the cylinders are not starved for cooling air from the baffle mounted air
intake filter.
Question: The fuel flows on WOT climb from sea level are enormous - as high
as 17 gph - so I'm wondering why I shouldn't lean during climb to reduce these
while keeping the CHTs in a comfortable range. I climb out at about 140 kts
typically. I'm burning 100LL.
Regards,
Ed de Chazal
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
assist with the management of the LML.
Please send your photos and drawings to marvkaye@olsusa.com.
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