Hi, Mark Gregor from Advanced Aircraft/Tecnam US here.
I hope you don't mind me responding but the post is referencing a Tecnam after all!
We end up discussing pros and cons of the Rotax engines regularly. All three Rotax engines are offered by Tecnam because we believe they are all good viable choices. It just depends on what you want. The 912ULS is a well proven engine at a low price. The 912is is the latest in technology, full fadec w automatic lean of peak operation below 97% power. Impressive but no more horsepower than the ULS and likely less in many conditions. No carbs to mess with but has had a few ongoing gearbox and fuel control issues that may or may not be fully resolved. Definitely much better than when it was first released though.
The 914 is a mature design but the turbo can be additional maintenance if a few basic care rules are not followed. The last 914s we delivered had carb leaks at high manifold pressure settings. Was easily resolved by a good Tech but goes to show nothing is ever perfect. With that said and nearly 1500 hours divided between all three Rotax engines the 914 is nearly always my first choice to pull out of the hangar. I like the 914 because it is smoother, quieter and substantially more powerful! The first time I flew the P2008 with the 914 i was very surprised how much stronger it was. Really sets you back in the seat compared to the 912. Takeoff roll is substantially reduced. The 914 cruises at 35 inches manifold continuous. At this setting the 914 is making a lot more horsepower that a 912. 40 inches manifold or 115% power as Rotax calls it is limited to 5 minutes. When I hear negativity about the 914 it is nearly always from someone who has never flown behind one.
Disadvantages? A $20,000 more than the ULS and $8,000 more than the 912is!
Mark Gregor
Gregorma@bevcomm.net
507-3279465