Thanks for the info.
How much of an efficiency loss would I experience?
And what about start stop? How would one go about that? Reroute starter motor to the BAS? Or have a fancier mechanism of injector cutoff an re-enable once the car is moving? (unfortunately the car is a 2003 MB ML350 with a 3.7L engine and an automatic transmission, it has 4WD).
For a motorbike conversion a shaft drive BMW would be awesome. I have an R1200GS and an R26 among others. But the shaft drive of the R26 would make it almost a drop in replacement for the motor (did not have a look at the rpms yet).