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ronlee(at)pcisys.net
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 Posted: Thu Oct 26, 2006 6:39 am Post subject: FADEC controlled engine problem |
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Background: New RV-7A, XP-360 engine, Aerosance FADEC system.
On the second flight the engine was surging at times. The pilot
reported a significant CHT drop on the #4 cylinder. On the first
flight that same cylinder had very high CHT but that data point
may be misleading.
Aerosance suggested moving the fuel injector to the number 2
cylinder to see if the problem moves. Certainly a valid way to
isolate a problem but since the problem was not duplicated on
a ground run it may not be best to try in again in flight.
Ignoring for now that the FADEC controller may be a problem
I am assuming three possible problems.
1) Inadequate fuel flow
2) Intermittent clog in the injector
3) Solenoid problem ( Apparently the solenoid on each injector
somehow controls the fuel injected in to the cylinder).
Fuel flow could be verified by disconnecting the fuel lines at the
injector and running the boost pump to verify fuel flow and eliminating
a clog in the line as a possible problem.
As far as the injector, I am assuming that there is a way to check
for blockage.
The owner should be checking documentation for additional info as well
as calling the manufacturer but if anyone has helpful advice it would
be appreciated.
Ron Lee
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skylor4(at)yahoo.com
Guest
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| Posted: Thu Oct 26, 2006 10:50 am Post subject: FADEC controlled engine problem |
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What did the EGT's do during the surging?
--- Ron Lee <ronlee(at)pcisys.net> wrote:
| Quote: |
<ronlee(at)pcisys.net>
Background: New RV-7A, XP-360 engine, Aerosance
FADEC system.
On the second flight the engine was surging at
times. The pilot
reported a significant CHT drop on the #4 cylinder.
On the first
flight that same cylinder had very high CHT but that
data point
may be misleading.
Aerosance suggested moving the fuel injector to the
number 2
cylinder to see if the problem moves. Certainly a
valid way to
isolate a problem but since the problem was not
duplicated on
a ground run it may not be best to try in again in
flight.
Ignoring for now that the FADEC controller may be a
problem
I am assuming three possible problems.
1) Inadequate fuel flow
2) Intermittent clog in the injector
3) Solenoid problem ( Apparently the solenoid on
each injector
somehow controls the fuel injected in to the
cylinder).
Fuel flow could be verified by disconnecting the
fuel lines at the
injector and running the boost pump to verify fuel
flow and eliminating
a clog in the line as a possible problem.
As far as the injector, I am assuming that there is
a way to check
for blockage.
The owner should be checking documentation for
additional info as well
as calling the manufacturer but if anyone has
helpful advice it would
be appreciated.
Ron Lee
browse
Subscriptions page,
FAQ,
Web Forums!
Admin.
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ronlee(at)pcisys.net
Guest
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| Posted: Thu Oct 26, 2006 1:44 pm Post subject: FADEC controlled engine problem |
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At 12:49 PM 10/26/2006, you wrote:
| Quote: |
What did the EGT's do during the surging?
|
I don't have that info. With the blizzard today I may not have
it until Friday...if it is known.
Ron Lee
Do not archive
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sjhdcl(at)kingston.net
Guest
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| Posted: Fri Oct 27, 2006 4:23 am Post subject: FADEC controlled engine problem |
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What type of prop and gov (assuming CS) is he running? I had a surging
problem with my governor.
Steve
RV7A
| Quote: | Time: 07:39:34 AM PST US
From: Ron Lee <ronlee(at)pcisys.net>
Subject: FADEC controlled engine problem
Background: New RV-7A, XP-360 engine, Aerosance FADEC system.
On the second flight the engine was surging at times. The pilot
reported a significant CHT drop on the #4 cylinder. On the first
flight that same cylinder had very high CHT but that data point
may be misleading.
Aerosance suggested moving the fuel injector to the number 2
cylinder to see if the problem moves. Certainly a valid way to
isolate a problem but since the problem was not duplicated on
a ground run it may not be best to try in again in flight.
Ignoring for now that the FADEC controller may be a problem
I am assuming three possible problems.
1) Inadequate fuel flow
2) Intermittent clog in the injector
3) Solenoid problem ( Apparently the solenoid on each injector
somehow controls the fuel injected in to the cylinder).
Fuel flow could be verified by disconnecting the fuel lines at the
injector and running the boost pump to verify fuel flow and eliminating
a clog in the line as a possible problem.
As far as the injector, I am assuming that there is a way to check
for blockage.
The owner should be checking documentation for additional info as well
as calling the manufacturer but if anyone has helpful advice it would
be appreciated.
Ron Lee
|
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ronlee(at)pcisys.net
Guest
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| Posted: Fri Oct 27, 2006 11:18 am Post subject: FADEC controlled engine problem |
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At 06:20 AM 10/27/2006, you wrote:
| Quote: |
What type of prop and gov (assuming CS) is he running? I had a surging
problem with my governor.
Steve
RV7A
|
Aerocomposites CS prop and MT P-860-4 prop governor.
Ron Lee
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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