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Scott,
Gosh, now I'll have
to look it up. When talking temps I usually assume it's all Farenheit,
unless I'm talking to my daughter who married a Canadian. It did seen low to me
at the time.
in your style--
Terrence O'Neill aka
RedHand
Lancair N211AL IO235/320
@ Greenville, IL (KGRE)
(what's SB89/96 stand
for?
----- Original Message -----
Sent: Friday, February 02, 2007 08:51
PM
Subject: [LML] Re: Boost pump use
I think it was Don at Aoirflow Performance who told me fuel boils at 130F
at
sea level. at 100F at 10,000 ft., and if pulled throuogh a filter to
the pump,
at 80F.
Terrence,
Are you sure those weren't degrees Centigrade?
The area behind my engine, the dead space betwixt the top cowl and
the air exiting the bottom of the engine cylinder head cooling fins, often
reaches 70C (158F), especially during a slower flight regime (airport traffic
pattern) on a hot day (30C+) at 1500 MSL. The fuel does not
demonstrate "boiling" or vaporization at such temperatures. However,
idling at slow taxi on a 30C+ (86F+) for a long time (20+minutes), where the
air temp behind the engine reaches 90C+ (194F+), there is a vaporization
problem that requires the boost pump (also sitting the 90C temp) to help the
engine pump (at God knows what heat soaked temp) raise the fuel pressure high
enough to force it back into enough of a liquid state so that the engine pump
could also push it thru the fuel system as a liquid at the proper
pressure.
140 kts+ climb or flight speed reduces the
cowl temperatures enough so that the fuel, under the proper pressure,
reaches the injectors and thence to the induction system for ultimate use by
each and every cylinder's advanced ignition system to be ignited so that
my air pump actually produces enough torque to be transferred to a rotor
device finally instigating sufficient rearward thrust that further relies on
Newtonian concepts to force the fuel laden wings passing thru non-violent air
to provide sufficient lift to overcome the instantaneous effects of gravity
(another Newtonian concept) so that my machine remains airborne
successfully once again.
Oh well, all I can do is operate in the future by what I have observed in
the past.
Scott
Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL
(KARR)
A man has got to know his
limitations.
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