Negative pressure supercharging

First I’ve seen of it. Reminds me of the engine i once saw where the cylinder was sealed at the inside of the engine Bore and 2 stroke reed valves like in a chainsaw were installed Under the block on each cylinder. It captured the pressure coming off the piston on the backside down stroke.
It took this pressure air and directed it into the carb. Kinda like a dual stroke. Piston looked like two pistons put together and a connecting rod drilled into the second piston. Stroke was short, very heavy engine. Made oodles of HP but low on torque. Late 80’s design. Emissions stuff back in late 70’s and early 80’s was crazy designed.