On Nov 27, 3:54*am, Ralf Mueller wrote:
just read about the new BMW S 1000 RR bike. The complete engine assembly
is less than 60 KG. Engine puts out 193HP (112 Nm, 12,000rpm). Wouldn't
that one (slightly detuned) make a nice SLA powerplant ;-))

I'd make a great SLA powerplant - as would other 4-cyl motorcycle
engines.

To answer other posts in this thread:

How long would a 12,000 RPM engine last?
Longer than a Lycoming. These engines are bulletproof.

They get their amazing power-to-weight ratio by being a high revving
engine. Trying to get the same power from a slow revving engine would
cut engine life since the bearings would have to handle far higher
torque.

Yes, you would need approximately 5:1 gear reduction but that's well
within the range of a single stage planetary gear set. Would it last
at thst RPM? Why not? Motorcycles have gears.

Like all engine conversions, it's all in the details. Do the
engineering right and it'll work fine.