912ULS or 912iS
in 912iS Technical Questions
8 years ago
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by Jim Flock » 8 years ago
Ask yourself this question....
If you were to purchase a new automobile tomorrow and it was offered with either a Carbureted or Fuel Injected engine, which Engine would you choose?
That's how I made my decision...
300 hours - no issues.
Aviation Real Estate Specialist & iRMT
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by Roger Lee » 8 years ago
Maybe no carb sync, but the iS needs the error logs downloaded each annual with a $1K dongle and a laptop computer and it takes as long or longer as the carb sync. I don't need a dongle and a computer to diagnose the UL engines.
How many of you might know a carb vs the workings of a fuel injection system and it's computers. There are some other trade offs.
Gearboxes?????? Hose change on a UL is straightforward, but now you have to deal with the 2 fuel pumps in their container on the iS and more things to remove to get to other hoses on the iS..
I think both are fine, but go in with more than I can save a little fuel with your thought process.
Give up one thing and inherit another.
It's like Chevy's and Ford's. You may only like one and not the other, but they both get you there.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
Thank you said by: FEDERICO COMPEAN
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by FEDERICO COMPEAN » 8 years ago
Thanks for your response. I do plan to take it to a mechanic every 100hrs (or 12 months) for maintenance, so I guess I wouldn't have to deal with the carbs or the inner fuel injection either way. But there isn't a mechanic in 200miles around me, so I want to keep that to a minimum.
I like the fact that you do save fuel. I hear is you go at least 25% further on the same gas.
I guess my question was more troubleshooting related. I heard that people have had trouble with this engine, 8 software updates in 12 months, some having to take out the engine (twice), etc.... but all I see here is happy 912iS people, so it's still a consideration.
Thanks for the input, and keep it coming if possible.
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by Glenn Martin » 8 years ago
I Agree Roger,
a bit Chevy vs Ford, and it does depend upon what your personal experience is. FYI I understand Injection systems better than I understand carbs !. The point is that we are all different.
They are both 100 hp approx Rotax engines and very reliable, either would be fine.
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by Glenn Martin » 8 years ago
All new Products seem to have teething problems, inspite of the efforts by manufacturers to make them perfect before they hit the market. You are correct there have been quite a few updates to the IS engines, as there were to each new engine including the ULS when it was first launched.
However these tend to taper off, I have not needed any software updates on my engine since new (2.5 years 400+ hr). I was lucky that the "gearbox mod" was before I bought it....but did need to do the Stator upgrade, paid for by Rotax of course.
I expect that if you buy a new IS from now there will be very few requirements for changes.
I do not have a dongle nor do I need one, the people whom service my aircraft have that gear, which of course they spread the cost over all of the engines they service.
Again as Roger says they are both good, comes down to personal preference really.
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