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1. 02:02 AM - Re: ghost in the engine 2200A (James, Clive R)
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| Subject: | ghost in the engine 2200A |
Have drained the fuel and filled up with fresh?
Regards, Clive
-----Original Message-----
From: owner-jabiru-list-server@matronics.com [mailto:owner-jabiru-list-server@matronics.com] On Behalf Of tutuzulu
Sent: 19 August 2010 03:12
Subject: Jabiru-List: ghost in the engine 2200A
Hi Listers,
I have an engine problem that has everybody, mechanics, Jabiru personnel, and of
course me, totally bamboozled. Any ideas would be welcome.
Here's a review of the problem so far
Immediately after the annual inspection in March, the engine began running rough
above about 2,650 rpm. It starts with a little roughness, and the longer it
runs above that rpm the rougher it gets, and soon the rpm starts bouncing around
wildly within a range of about 2,500 to 2,750. One of the cylinders will
start cooling down in EGTs and CHTs. Which cylinder it is will change; its nearly
always 2 or 4, sometimes 3, and rarely 1. When the power is reduced below
about 2,650, the cool cylinder warms up and everything runs smoothly.
It seems like after every change (see below), it runs a little bit better for a
little while, but then reverts to the same problem. Its interesting that I can
run it for a while and have the problem be on one cylinder, then shut it down
for 5 minutes and then start it again and have the problem be on another cylinder.
The following have resulted in no change:
L, R, or Both magnetos.
Carb heat On or Off.
Electric fuel pump On or Off.
Replaced rotors, distributor cap, spark plug wires, and sparkplugs.
New carburetor. (The only difference this made was that a couple EGTs ran too
high.)
Inspections that were normal:
Ive removed the carb and looked into the intake manifold but could see no obstructions
or abnormalities.
There was no metal in the oil filter.
All the valve springs appear to have the same resistance when I push on them.
The rocker arms all appear perfectly aligned when in the full up/out position.
I also removed the air intake Scat hose and tried running it with carb intake open
to the engine compartment, with both the old and a new carb. No difference.
I'm grounded and heartbroken.
Anybody got any ideas?
Many thanks,
Bob Miller
--------
Bob Miller
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=309346#309346
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