912is back to a 912

by Malcolm Huddart in 912iS Technical Questions 7 years ago

Can a 912is be converted back to a 912 with proper carburretors & magneto's ?
Our 912is is becoming unreliable and difficult to maintain, it has now got to the
point where the downtime is affecting our operation.

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Re: 912is back to a 912

by Richard Boslaugh » 7 years ago

Richard Boslaugh

9 122 84

What issues do you have with you 912iS. I have a 912iS with 200 hours and would be interested
in what problems could arise

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Re: 912is back to a 912

by Glenn Martin » 7 years ago

Glenn Martin

3 281 795

More info please.
It would be "possible" but I suspect the change back would be for more work than finding a qualified 912IS mechanic or someone whom wants to learn the new technology. I am sure the problems can be solved with the right people working on it. Where are you ? what resources do you have around you ? what are you trying to do that is different.

I "live" at a little field about as far from ROTAX as possible (south Island New Zealand) it has taken time for the support infrastructure to get their head around the new tech, if you are having trouble find a modern race car guy they know ECU's and fuel injection management very well it is their daily bread, perhaps they can help you ?

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Re: 912is back to a 912

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.96k

The simple answer is NO.
Converting back to carburetors is impractical and illogical.

The engine will tell you what is wrong with itself.

Do you have the BUDS software and "Dongle"?
They really are required and not optional.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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Re: 912is back to a 912

by Malcolm Huddart » 7 years ago

Malcolm Huddart

5 39 107

It appears that 912iS goes through gearboxes whereas all the 912 don't suffer from this as much. We have had 3 gearboxes in 600 hrs. The symptoms are vibration which cracks Exhaust systems. There are approx. 17 Eurofox Glider Tugs on the UK Register only 5 of them including ours is a 912iS. Ours has the highest number of hours, there are Eleven 912 which don't seem to suffer the same gearbox problems.

There maybe some Operating techniques or Maintenance procedures that might help but Rotax are not giving us any help in this matter.

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Re: 912is back to a 912

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.96k

What engine are you referring to?
912 only designates an engine series. The 912 comes in the 912A, F, S, UL, ULS, and iS variations.
A 912UL is way different from a 912 ULS.

Gearbox issues usually point to excessive 'Moment of Enertia' in the Propeller. (Too Heavy of a Prop)
Excessive Moments of Enertia are hard on the gears and can damage the clutch quickly.
What Propellers are you using? Have they been Balanced?

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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912is back to a 912

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