Today's Message Index:
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1. 03:15 PM - Io540 high power miss or roughness (Jim Stone)
2. 04:01 PM - Re: Io540 high power miss or roughness (Carl Froehlich)
Message 1
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| Subject: | Io540 high power miss or roughness |
Hi Guys,
I had something new happen today in my Rocket. The engine ran rough at high power
settings. I rejected the takeoff. Mag and ElectoAir checked normal on ground
and engine ran smoothly. I pulled the cowl and verified all spark plug leads,
fuel injection lines, air intake tubes, fuel servo and fuel lines were all
normal.
I suspect it is fuel related because after climbing to altitude when I attempted
to lean the engine it ran rough and no cylinder was lean of peak.
I recorded the engine instruments for later reference but saw no issues on EGT
and CHT graphs. I did not notice the takeoff fuel flow number but can retrieve
it from the recording tomorrow if someone could use it.
Any ideas of where to start troubleshooting?
Jim Stone
Louisville Ky
502-235-3599
Message 2
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| Subject: | Io540 high power miss or roughness |
I assume this just started, you did nothing before it started, and you did
all the basic timing checks.
Sounds fuel related to me as well. Just troubleshot a fuel issue on an
IO-360 after talking to Don at AirFlow Performance. He told us to start
with a fuel flow test (disconnect the spider fuel lines as each injector and
put a shot glass at the end of each line to collect the fuel). Ours was an
idle issue with one cylinder going way lean. The flow test (throttle
cracked open, mixture at half, boost pump on) showed one cylinder getting
half the flow of the others. We sent the spider to Don and he found a piece
of junk floating in it.
One other check is to lean at fast idle - make sure all the EGTs go up. If
they don't you are already LOP at fast idle.
As you describe excessively lean condition on all your cylinders I suspect
you are having a more basic issue - such as the spider diaphragm not lifting
against the spring to open the path for fuel to flow (other possibilities as
well). Recommend giving Don a call.
Carl
-----Original Message-----
From: owner-lycomingengines-list-server@matronics.com
[mailto:owner-lycomingengines-list-server@matronics.com] On Behalf Of Jim
Stone
Sent: Monday, October 05, 2015 6:15 PM
Subject: LycomingEngines-List: Io540 high power miss or roughness
--> <jrstone54@att.net>
Hi Guys,
I had something new happen today in my Rocket. The engine ran rough at high
power settings. I rejected the takeoff. Mag and ElectoAir checked normal
on ground and engine ran smoothly. I pulled the cowl and verified all spark
plug leads, fuel injection lines, air intake tubes, fuel servo and fuel
lines were all normal.
I suspect it is fuel related because after climbing to altitude when I
attempted to lean the engine it ran rough and no cylinder was lean of
peak.
I recorded the engine instruments for later reference but saw no issues on
EGT and CHT graphs. I did not notice the takeoff fuel flow number but can
retrieve it from the recording tomorrow if someone could use it.
Any ideas of where to start troubleshooting?
Jim Stone
Louisville Ky
502-235-3599
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