well, i wish i had the funds to experiment, and i don't envy you your research.
while i believe the 2 centrifugal clutches would allow both engines to operate at the same time, i'm not buying that they'd synchronise themselves, power-wise...i think all that would happen is the slower/weaker one would only be making noise while the faster/stronger had the load. and, if i'm correct, once you've the attained engagement-rpm of the weaker one, then it becomes a drag on the stronger one.
again, i think anything could be synched with anything, including the human engine. but humans are able to instinctively adjust, or synchronise, which is one of my favorite parts of this motorsport. i assist the engine,
or the engine assists me, and it's my choice.
so, you're saying you're willing to do the science (play with 2 throttles) every time you want dual, or triple, drive...again only opinion, but it sounds like pre-engineered trouble to me. and you haven't even begun to figure out how to make sure that your mismatched system will synch-up as pertains to gearing to tire-on-road, powerband/range, temperature, etc... heck, adjusting myself to the throttle-response of 2 different engines is enough to convince me i wouldn't bother if i had the choice ahead of time. like dog-sledding with a husky & a shepard, both good dogs but with entirely different sled-pullin attributes. now that i read that last line: even synchronizing the 2 dogs would be an easier task...they can learn to work together, while the engines never can.
EDIT: what the heck am i doing up so late? everyone, it's been a GREAT weekend here on the board, thanks to you all.
kenspice...to be continued