Like what parts move to make the engine dip. Like in [this](https://www.instagram.com/reel/CONyYFZp4VM/?igshid=krf7sw1o8q3a) video?
In: Engineering
The engine and transmission are on semi-rubber mounts. When the engine is making big power against the resistance of the dyno the engine/tranny will twist in the mounts. This twist is against the driveshaft(s) connected to the wheels running on the dyno
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