Hi all,=0AI flown my europa with a 912 80hp during 1200h/11years.It's a mar
k one but with =0AXS engine mounting and cowlings.Majority of flights took
place here in the =0AFrench Alps as well in -summer as in winter. I never
had icing-issue although I =0Ahad no carb preheater-.The only caution
I had ,when descending-,was to keep =0A4500/4800 rpm .-Never in idle po
sition.=0AIn the beggining of that year I change-my-912-for a new 912
S 100hp. That new =0Aengine has now about 125h. Yesterday I had for the fir
st time a rough running =0Aduring few seconds.Outer Air Temp was negative a
t every level and the issue =0Aoccurs at the end of a descent 4500/4800rpm
---From 8000ft to 1500ft. There was =0Aabout- 8=B0C- of difference at grou
nd level betwen OAT and dew point.=0ASeveral time I read on Rotax and Europ
a web site discussions about icing issues =0Aand I-kept in mind that 912S
should be more sensitive to icing than 912.=0A=0AAs-I know:=0A* -Ca
rbs are the same ,except needle diam (2.72 versus 2.70 on S)-and ,may be,
=0Amain fuel jet-and diffuser (in accordance with needle)-.Does those
difference =0Acould explain more-sensitivity to icing?=0A* Compression
ratio and bore-are increased on S--but stroke is the same-. In my
=0Aopinion these difference have not thing to do with icing issue.=0A-So
here is my question-:-Could some body explain why a 912S should be more
=0Aexposed to icing than a 912?=0A=0AJean-Philippe Neel=0AF-PSLH Kit N=B02
73=0AGrenoble France-----=0A=0A=0A
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