Like what parts move to make the engine dip. Like in [this](https://www.instagram.com/reel/CONyYFZp4VM/?igshid=krf7sw1o8q3a) video?
In: Engineering
It’s compression/extension of the suspension.
There’s some motion of the motor within the mounts, like /u/drewathome mentions, but the bulk motion when it gets up to full power is compression of the rear suspension (and matching extension of the front suspension).
This is happening because of the torque against the dyno. The engine is twisting the dyno shaft, that reaction torque comes back through the wheels into the transmission, then into the frame. So the entire car is getting torqued counterclockwise (from the angle we’re looking in the video). That compresses the rear and extends the front suspension.
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