CAUTIOUS NOTE
I have flown behind a 912S for years. At least in a tractor installation, with a cowl, this engine does not seem prone to icing. I am NOT recommending anything, but I have tried to ice one of these, and just can't seem to do it. I have flown it with ZERO difference between dew point and temp. Tried various things within gliding distance from the field. I think there is enough heat generated within the cowl, that it warms the air enough to prevent icing. If others have had different results, I would really like to hear them.
John Bender