Not Correct!
From the Rotax aircraft website at www.rotax-aircraft-engines.com
Both the 912 and the 914 are 1211cc and 9:1 ratio. The 912S is
different at 1352cc and 10.5:1
All three use the same crankshaft and connecting rods (they are a
single unit and cannot be separated) p/n 888164. The 912 and 914 used
79.5mm dia piston p/n 996549 and the 912S uses 84mm p/n 88838. there
is also a difference in the piston pins and rings. Some earlier 912
and 914 engines use crank p/n 996583.
cheers
Simon
On 12 Jan 2008, at 16:25, rlborger wrote:
> Curtis & other Europaphiles,
>
> Oops, hit the wrong button on that previous transmission.
>
> The main difference between the 912 and 914 are different
> compression ratios due to the different pistons and (I believe)
> connecting rods. The three engines 912, 912S and 914 all have
> different compression ratios.
>
> Of course, the exhaust systems are quite different due to the
> presence of the turbo.
>
> There are also differences in the lube system to support the special
> lubrication needs of the turbo.
>
> There may be other differences.
>
> Good building and great flying,
> Bob Borger
> Europa Kit #A221 N914XL, XS Mono, Intercooled 914, Airmaster C/S
> http://www.europaowners.org/N914XL
> (90%) tail kit done, wings closed, cockpit module installed, pitch
> system in, landing gear frame in, rudder system in, outrigger mod
> in, Fuselage Top on, lift/drag/flap pins in, wing incidence set, tie
> bar in, flap drive in, Mod 70 done. Baggage bay in. Flaps & Main
> Gear complete. Mod 72 complete. Instrument panel complete, except
> for testing. Rotax 914 installed (for the 3rd time). Airmaster
> Prop installed. Electrical complete, except for testing. Fuel
> system complete except for testing. Working in - 32 Tail, 34 Door
> Latches & 35 Doors, 37 Interior & Finishing. Airmaster arrived 29
> Sep 05. Seat arrived from Oregon Aero. E04 interior kit has
> arrived and is being installed.
> 3705 Lynchburg Dr.
> Corinth, TX 76208
> Home: 940-497-2123
> Cel: 817-992-1117
> On Jan 12, 2008, at 9:49 AM, Curtis Jaussi wrote:
>
>> Does anyone understand the real differences between the Rotax 912ul
>> and the 914? As far as I can determine, they are the same engine
>> except for the turbo. The displacement and the pistons seem to be
>> the same. is the 914 beefed up in some way to take the extra
>> strain from the turbo? Has anyone heard of an after market turbo
>> for the 912?
>
>
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