Bob,
I am sure the Jabiru is a wonderful engine. Fact is the Rotax doesn't need a
ring
job. I have flown Katanas with 3000 hours on the clock without overhaul, and
this at aflying school, where engine and airframe get a real hammering.
Karl
From: "R.C.Harrison" ptag.dev@ukonline.co.uk
Subject: Re: Europa-List: Rough running 912S again
Date: Sun, 28 Mar 2004 21:19:10 +0100
-- Europa-List message posted by: "R.C.Harrison" ptag.dev@ukonline.co.uk
Hi! Richard.
I'm not a Rotax "buff" but IMHO it sounds to me like a weak mixture case,
where you are lightening the load and get a rough run due to mixture. Whilst
in the climb you may have the carbs delivering more fuel that the engine can
develop power for , so when you throttle back the mixture leans off too far
giving a rough run.
Just a suggestion, perhaps some carb tuning specialist would care to put his
remarks to this theory.?
Regards
Bob Harrison G-PTAGEuropa MKI/Jabiru 3300 (back in the air with a 200
re-ring job done...... bet you can't do a ROTAX 4 Cylinder as cheap !)
----- Original Message -----
From: "Richard" riddon@btinternet.com
Subject: Europa-List: Rough running 912S again
-- Europa-List message posted by: "Richard" riddon@btinternet.com
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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