stewart graham
Joined: 27 Feb 2011
Posts: 7
Location: launceston Australia
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 Posted: Sun Apr 21, 2013 2:43 am Post subject: Yak-List Digest: 33 Msgs - 04/19/13 |
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RE: our beloved M14 & Housani engines and their idiosyncrasies
Dear ALL
I have a standard M14 P in my Yak18T to which we have fitted the
intake drains.
We noted the sludging of oil previously mentioned in the list, particularly
in winter & observed the gradual clearing of fuel colour noted by Mark &
others on the list. This washing out of the intakes is now SOP. It also
seems to work better with a pilot(my wife) priming the engine whilst I turn
the blades, I'd guess the spinning supercharger impellor is helping??
We have recently fitted sump oil heaters to all 3 aircraft, M14P(sump & oil
tank), Lyc IO 360 & 0 320. Winter is not yet fully here but the results
have been thus far impressive.
Oil sits at about 30-35 deg C in all engines, cylinder temps between 25-35
deg C in all engines. We have cowl covers on all & overnight temps to date
are -1 de C
The oil drain from the M14 has been a little more obvious but the big
changes are no thick oil at all, rapid clearing of the intake drain to clear
avgas & oil temp to 40 deg C within 5-7 min at ambient of 0 to 7 degC. Prior
experience was that it took about 20 minutes to be ready for taxi. All
engines now warm very quickly, so far in less than 10 minutes all 3 are
ready to launch.
Will report mid winter, where we expect ambient to be below 0 deg C most
nights for 2-3 months.
I have a question re CHTs in the M14 P. We have fitted a digital cht gauge,
expecting the worst but the results so far have been rather lower than
expected. At TO(95% & WOT) & climb(80% & 800mm MP) gills wide open, 105-7
kn, 500f/min cruise climb the top 2 cylinders run about 190 C, the lowest 2
run 160 deg C. At cruise setting to achieve 180 HP at 6000-10000 ft i have
to almost completely shut the gills, run the carby heat all the time
(ambient typically 5 to -5 deg C) but the lowest 2 run hottest, usually 160
with the top 2 only just staying at 130 deg C.I understood the spread was
from lean mix at the top but why the reverse at cruise?
So any explainations re chts??
Cheers
Stewart Graham, Tasmania Australia
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