Um have you ever heard of this wonderful invention called a bearing?
there really great, you see they can be used to mount a rotating component into a fixed component and they eliminate transmission of rotational forces from on to the other
Do they? 100%?
When you rev your engine it rocks on its mounts yes?, this is because the torque reaction makes the block rotate in the opposite direction to that of the crank yes?
But in order for it to twist the block like you are suggesting one end of the crank would need to be accelerating faster hence creating more torque or even rotating in the opposite direction than the other end.
Its the same as if you held a small cardboard box in both hands.
If you twist your hands in different directions it will subject the box to torsional stress, but if you twist your hands in the same direction the box still twists (just like an engine block) but both ends are twisting at the same rate, hence the block its self is not being subjected to torsional stress!
Now solid mount that cardboard box eg engine mounts, are you still telling me the box will rotate freeley?
f your theory was correct then how come your diff casing doesn’t split every time you dump the clutch? I mean you’ve got the prop and drive shafts spinning around inside it, surely that’s guna twist the hell out of it! lol.
And it doies twist the hell out of it, but generally diff casings are very strong and usually the internal gears go first, if not then the shafts or prop UJ go.
If you have a diff with indistructable gears and indistructable shafts that have guaranteed 100% traction attached to anotherwise indistructable drive train the yes the diff casing will break, why do you think they do a thick wall diff casing for the front diff on the escort cosworth, thats because it's renowned for breakin due to high TORQUE and often rips itself of the mountins as well du to ROTATIONAL FORCES inside the casing.
if you need more info i will give you the email address of some lecturers on my course who im sure would be more than happy to explain this to you! lol.
Feel free to ask all your lecturers about this and point them in the direction of this link, NOTHING mechanical is 100% efficent
PJay