yes, i’ve seen the video of the supercharger on the moped, and thats the one i’m talking about. it sounds good, but notice it just appears to be a simple cylinder that is connected to the carb itsself. there doesn’t appear to be any type of charge tube, or venturi chamber that due to the shaping increases the speed of the intake air past the point than it would normally get if it were just sucking in air on its own. think of a venturi like this
expulsion—-< <—-<—-air -+—propulsion
any gas or liquid going from a greater area amount, funneled through to a smaller amount will speed up the expulsion of said gas or liquid to an exponential amount. this rush of air is the only way to FORCE more air than what is used inside of a combustion chamber.
definition: The fluid velocity must increase through the constriction to satisfy the equation of continuity, while its pressure must decrease due to conservation of energy: the gain in kinetic energy is supplied by a drop in pressure or a pressure gradient force. The effect is named after Giovanni Battista Venturi
now, the cylinder style used in that video won’t work as effective as it looks or sounds, because it is a simple cylinder, with a turbine connected at the end. it takes engine work to turn that belt, and the power gain from the turbine doesn’t appear to out weight the power loss from the engine output.
engines work by creating compression on the down stroke of the piston. turbines aid in make more effictive use of piston stroke, allowing pressure to be created on both the up and down stroke of the piston, but this also requires work, but in a larger displacement engine, there is a LARGER cc gradiant of run off that allows the turbine to spin at a speed fast enough to see a gain of power over work ratio. this small turbine doesn’t appear to accomplish this task
i will repost this in a new topic on supercharger defined