Ignoramus26468 wrote:

Have you considered using a system of pulleys?

The pulley on the generator head side could be attached to a separate
shaft, which would be connected to the head's shaft with a U-joint.


Pulleys? For a 25 KW alternator? That could be pretty big! The alternator
may not like that much side force on the shaft, either.



Another idea I'm thinking about is having a plate machined that would
bolt to the flywheel and have a 1.5 inch shaft coming off of it that I
could couple to the generator head with a heavy duty rubber insert
type coupler. (I'm concerned that this setup would be hard for me to
balance, and the stresses on the shaft welded to the plate be to high)


Many alternators and generators designed for IC engine drive have a "quill"
inside a hollow shaft. This is essentially a torsion spring that allows
the engine
to vary in speed due to the power strokes without massive torque pulses
between
the engine and alternator. If this alternator is so equipped, the quill
also serves
as a coupling, and will take quite a bit of misalignment. They often have a
rubber damper (looks like a tiny clutch) to absorb any resonance in the
quill.

This would work if you can run the motor continuously at the desired
RPM, is it 3,600 or 1,800 for those ST heads?


Yeah, if its a 3600 RPM alternator. you REALLY don't want to have the
car engine wailing away at 3600 RPM all the time.



Jon