I recently purchased an aircraft running a Rotax 912 UL. The last owner replaced the stock Rotax regulator/rectifier with a Key West model after it died (http://www.aircraftspruce.com/catalog/eppages/keywestregulator.php). The Key West regulator died about 100 hours later. I installed a new one, but immediatley noticed that it runs really hot, even though the current draw was only 5 amps. I spoke with the engineers at Key West today and they informed me that their unit was designed for the Rotax 2-strokes. They said that it will not work on the 912 because the generator was designed differently. Can someone explain the differences between the generator on the 2-stroke and 4-stroke models? I believe it specifically has to do with shorting the lighting coils vs not shorting them.
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Re: Key West Regulator/Rectifier with 912 UL
by RotaxOwner Admin » 8 years ago
Suggest you review this service letter: https://legacy.rotaxowner.com/si_tb_info/serviceletter/sl-912i-005.pdf
"The use of non-approved parts in ROTAX engines is not recommended and is strongly discouraged..."
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Re: Key West Regulator/Rectifier with 912 UL
by Kyle S » 8 years ago
I understand but that does not explain the differences between the 582 and 912 generators.
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Re: Key West Regulator/Rectifier with 912 UL
by RotaxOwner Admin » 8 years ago
If you want to really understand the systems, you can take some iRMT courses. :)
http://rotaxflyingclub.com/courses/training
Or you can download the 912 IPC and the 912 Heavy Maintenance manual,
http://www.rotax-owner.com/en/support-topmenu/engine-manuals
and compare what you find there to this 582 wiring diagram:
582_electrical.png (You do not have access to download this file.)
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Re: Key West Regulator/Rectifier with 912 UL
by Bill Hertzel » 8 years ago
The 582 has a 170 Watt Generator, and the 912 has a 250 Watt generator.
That pretty much makes all the difference needed to smoke a regulator.
Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.
Thank you said by: Kyle S
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Re: Key West Regulator/Rectifier with 912 UL
by Roger Lee » 8 years ago
Hi Kyle,
What plane is this in.
Put the stock Rotax VR back in. """Just make sure it's in an area that gets some cooler air flow."""" Don't put it in a hot area. Make sure it's grounded.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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