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912ULS or 912iS

  • FEDERICO COMPEAN
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1 week 2 days ago #16938 by FEDERICO COMPEAN
FEDERICO COMPEAN created the topic: 912ULS or 912iS
So I'm about to buy a pipistrel virus SW and was wondering if the 912iS is a better option over the 912ULS in the general community's opinion. I know there have been issues with the 912iS, but is it all done with?

Which motor would you buy as of today?

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1 week 2 days ago #16940 by Roger Lee
Roger Lee replied the topic: 912ULS or 912iS
912ULS simplicity for me.

This conversation may be like Chevy's and Ford's.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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1 week 2 days ago #16941 by FEDERICO COMPEAN
FEDERICO COMPEAN replied the topic: 912ULS or 912iS
you mean confidence because its well known? or simplicity? because I thought you saved a lot of carburator work, hence 912iS being simpler..... but I'm no expert

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1 week 2 days ago #16942 by richard Boslaugh
richard Boslaugh replied the topic: 912ULS or 912iS
I have a 912iS with 230 hrs. I had some issues with gearbox, however all corrective work was in warranty. I would buy another 912iS if I were to build another A/C.

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  • Bill Hertzel
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1 week 2 days ago #16943 by Bill Hertzel
Bill Hertzel replied the topic: 912ULS or 912iS
The difference between the 912is and the ULS is the Induction system. Carbs vs. Fuel Injection.
The 912is has a few minor Differences/Improvements but the rest of the engine is essentially the same.

As 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.

My crystal ball says that within 5 years, Rotax will only offer the 912is and the 915 Turbo engines for new installations.
The ULS will have after market support for 10-15 years and then join the carb'd Auto engines as a part of history.
The following user(s) said Thank You: Rhett Mitchell

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1 week 2 days ago #16944 by Glenn Martin
Glenn Martin replied the topic: 912ULS or 912iS
I have two Aircraft one with a ULS (100 hr) one with an IS 420 hr.
the IS starts easier runs smoother, burns less fuel, No Carb syncing, no carb icing. Both great engines but I wish both were IS.

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1 week 2 days ago #16947 by Jim Flock
Jim Flock replied the topic: 912ULS or 912iS

Bill Hertzel wrote: 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.

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1 week 2 days ago - 1 week 2 days ago #16951 by Roger Lee
Roger Lee replied the topic: 912ULS or 912iS
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)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last Edit: 1 week 2 days ago by Roger Lee.
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1 week 20 hours ago #16973 by FEDERICO COMPEAN
FEDERICO COMPEAN replied the topic: 912ULS or 912iS
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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1 week 20 hours ago #16974 by Glenn Martin
Glenn Martin replied the topic: 912ULS or 912iS
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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1 week 20 hours ago #16975 by Glenn Martin
Glenn Martin replied the topic: 912ULS or 912iS
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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6 days 1 hour ago #16993 by Rhett Mitchell
Rhett Mitchell replied the topic: 912ULS or 912iS
If I could afford it, I would go with the injected engine. It's been out long enough for most bugs to be sorted and Rotax mechanics to become familiar.
I big bonus (as I see it) it the greater range of the aircraft brought about by the better fuel economy....

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