Another thought, I have also just installed MOD 12, which is an extra
baffle in the exhaust of a 912S (placed in the outlet to stop an
internal plate coming loose and blocking the exhaust). Could this slight
additional restriction of the exhaust possibly be causing the problem?
Richard Iddon. G-RIXS
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Richard
Subject: Europa-List: Rough running 912S again
Following my report of rough running of my 912S last week, I flew with
my inspector today to try to replicate the conditions in which the rough
running occurs.
It seems to happen at the top of a climb, when the aircraft is levelled
off, speed builds to cruise then I back off the throttle. At this point,
the engine 'plucks' for a minute or so then smoothes off. I have a C.S.
prop and if I keep the manifold pressure towards the top end of it's
range, say 25in. the plucking continues until I back off the throttle
and reduce the pressure.
The day was rather cool and humid, the windows kept steaming up even
with the vents open. Is this likely to be carb icing or does anyone with
rather more experience than me have any other idea's?
Richard Iddon. G-RIXS
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