[VaSteve]

Originally Posted by Rusty Heap

after watching that many many times back to back, you can see a vertical linear bearing or pneumatic cylinder in the back ground that controls a water flow valve, engine isn't under any load till half way through the dyno run.

Most likely, this is a hydrostatic dyno where you put more and more load on it via the engine turning a water pump and you can vary the load this way (did some dyno work back in College with a beater 2 barrel carb'd Chevy 350 on a waterdyno) it took 8-10 horsepower just to idle the engine, keeping the piston mass/crank/oil pump/valve train resistance all spinning.

Note 1/2 way through the video, the vertical actuator in back drops, openning the water valve, engine reacts by torque rotation to the left, raising up on the right, and then the birthing process starts.
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Thanks for explaining that. You hear it start working at :24 with that whine...I wondered why it did that.