Hi Chris,
When you balanced the Carbs, what RPM was the engine running at?
Cheers
James
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________________________________
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matr
onics.com> on behalf of n7188u <chmgarb@gmail.com>
Sent: Monday, February 13, 2023 7:04:15 PM
Subject: Europa-List: Re: New engine runs a little rough when weather is co
ld.
Hi everyone,
I promised an update so here it is.
In a nutshell, I decided to follow my eyes, which were looking at very whit
e rear cylinder plugs. So I decided to move the needle from position #3 to
position #4 and enrichen the mid-range mixture.
The jury is still out since I only did two flights since the change but the
difference is notable in terms of engine smoothness. But too early for fin
al conclusions. I did pull the plug and it looks a more reasonable light ta
n now which I think is an improvement. I will report back on the mid-range
adjustment once I do a few flights in different conditions.
But what really caught my attention is that for the last three years, even
with changing to a new engine, I had to put up with crappy idling 912Ss (at
least by my picky standard). I always thought that that was the way these
engines idle, particularly the high compression 912S.
Well, I finally decided to play with the idle mixture. I had moved the idle
screw a flat or so in the past to see if anything happened but not much di
d. But this time around I decided to move the screw in or out one flat at a
time until something happened. Well, what a pleasant surprise when the eng
ine started to get smoother as I screwed the needle in but not until you ar
e at less than one turn from fully closed. And I mean HUGE improvement. All
the roughness went away and now it idles smoothly.
Again, I still have to fly more with these settings but what a difference s
o far.
I told a Rotax 912S owner friend of mine all this and he recommended I watc
h this video. I think it exemplifies my newly acquired conviction that the
carbs in the 912S have to be tuned beyond just the simple balancing.
https://www.youtube.com/watch?v=GxEORpdJp0w
Best,
Chris
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http://forums.matronics.com/viewtopic.php?p=510157#510157
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