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pilotdds(at)aol.com
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 Posted: Mon Mar 05, 2007 12:16 pm Post subject: Flowscan in tunnel-pirep |
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I have noticed a fuel flow fluctuation when leaning above 5000 feet. When using only the aircraft engine driven fuel pump the flow fluctates between 14.2 and 16 gph.I suspect boiling fuel and or cavitation in the tunnel mounted flowscan.Egts remain fairly steady.This is at 70 percent power and 1350 on the hottest egt.The fuel injection is airflow performance.I intend to relocate the flowscan to the engine between the controller and the spyder.My tunnel is well insullated and has blast air to keep cool.Has anybody else had similar problems?Great flying bird I hate to take it down for maintanance but I would hate to have the engine stop.
728DD 117 hours
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GenGrumpy(at)aol.com
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| Posted: Mon Mar 05, 2007 5:57 pm Post subject: Flowscan in tunnel-pirep |
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In a message dated 3/5/2007 2:18:51 PM Central Standard Time, pilotdds(at)aol.com writes:
| Quote: | I have noticed a fuel flow fluctuation when leaning above 5000 feet. When using only the aircraft engine driven fuel pump the flow fluctates between 14.2 and 16 gph.I suspect boiling fuel and or cavitation in the tunnel mounted flowscan.Egts remain fairly steady.This is at 70 percent power and 1350 on the hottest egt.The fuel injection is airflow performance.I intend to relocate the flowscan to the engine between the controller and the spyder.My tunnel is well insullated and has blast air to keep cool.Has anybody else had similar problems?Great flying bird I hate to take it down for maintanance but I would hate to have the engine stop.
728DD 117 hours |
For what it's worth, my fuel flows have all been steady at all altitudes thus far. I have not done anything to cool my tunnel other than eliminate one of the heater muffs and install a valve to control ram air into the one remaining heater muff.
Grumpy
40404 and 50 hours.
do not archive
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Mon Mar 05, 2007 6:58 pm Post subject: Flowscan in tunnel-pirep |
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I've seen, on a hot summer day and a hot 2nd takeoff, a drop in
fuel pressure while climbing....when you're at high fuel flows
and high angle of attack (lots of heat), but nothing like you're
describing when leaning above 5000'...only in full-power climb
hot mode. On not steaming hot days, it's just the usual 28-29gph
flow rate with plenty of pressure and when you start leaning it
out it's always got great pressure. You could be correct
that it's a heat or cavitation issue of some sort, but I don't
think the default location for the fuel flow sensor has any real
problems with it. That's not to discourage you from trying
something new...but I just don't think it's been a common
problem that's been identified.
Tim Olson - RV-10 N104CD - Flying
do not archive
pilotdds(at)aol.com wrote:
[quote] I have noticed a fuel flow fluctuation when leaning above 5000 feet.
When using only the aircraft engine driven fuel pump the flow fluctates
between 14.2 and 16 gph.I suspect boiling fuel and or cavitation in the
tunnel mounted flowscan.Egts remain fairly steady.This is at 70 percent
power and 1350 on the hottest egt.The fuel injection is airflow
performance.I intend to relocate the flowscan to the engine between the
controller and the spyder.My tunnel is well insullated and has blast air
to keep cool.Has anybody else had similar problems?Great flying bird I
hate to take it down for maintanance but I would hate to have the engine
stop.
728DD 117 hours
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