But of course, whooping and hollering on your sybian would make a lot of noise, too.
In my garage I have a small block 350 chevy engine on a dyno test stand with a flywheel and starter. It makes about 500 HP @ 470 ft/lbs of torque. We could put a couple of quiet mufflers from PEP boys on the headers to keep it quiet.
Then, I can mount a rod on the flywheel about 4" from the center. With the appropriate quide, a Wieder benchpress bench to lay on and firm dildo it could surely send you into another world at about 6500 RPM with an 8" stroke. That is, provided a quart of synthetic motor oil would not get hot enough from the friction to smoke. The problem is, if it got stuck up there and "locked up" it would rub all of the skin off of your ass and back before I could get it stopped.
Maybe we better not try it.