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  #1  
Old 11-23-2015, 03:52 PM
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Default Why is Rotax 912 called 912?

I asked over in the Rotax Owner’s Forum and haven’t got an answer. Thought for sure those guys would be in the know. My questions is… why is Rotax 912 called a 912? I don’t think it has anything to do with engine displacement. Something that was bothering me and got my curiosity up.

Edit... I have just emailed Rotax in Austria this same question. I'll advise answer soonest.
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Last edited by Piper J3 : 11-23-2015 at 04:07 PM.
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Old 11-23-2015, 05:24 PM
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I always thought it was 912 cc's?

CJ
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Old 11-23-2015, 05:31 PM
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Nope! The original 80 hp was 1211cc and the 100 hp 912S is 1352cc.
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Old 11-23-2015, 05:40 PM
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And I believe the 914 is the same displacement as the 80HP 912, just boosted to 45" MAP.
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Old 11-23-2015, 05:44 PM
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That is correct!
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  #6  
Old 11-23-2015, 05:49 PM
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And so the mystery continues...
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80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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Old 11-23-2015, 06:40 PM
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Because the 912 is the 4 cylinder version of the 6 cylinder 911, obvious answer from a Porsche guy.
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Old 11-23-2015, 07:48 PM
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because it costs 912 times what it should cost!

bob burns
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Old 11-23-2015, 08:05 PM
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You should have seen th FIRST 911 designs.......!
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Old 11-24-2015, 07:06 AM
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Answer from over in the Rotax Owner's Forum an hour ago...

Christian Wilfling
NOW ONLINE
Fresh Boarder

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Hey Guys,

asking Hans Paierl, "the father of the 912" concerning this question,
he laughed and said: back in 1989 Rotax were building engines with less than 1000cm3
and because our account department could not handle more than three numerics back then,
he decided to choose the niner for Aircraft engines and the 12 for 1200cm3 cubic capacity
of the first 80 HP Rotax 912.

Cheers,
Chris
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EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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