Originally Posted by SalvadoriRacing
it's called venturi system........
it's supposed to work as the venturi on carb intake, but I don't think it makes any difference, I also have tried a M. Rossi shaft in a JP and the engine worked even better and less crictical........
I thought that a venturi was used to suck liquids from a tube in the center of the venturi. Does not sound right to me. Do you mean a volacity (spell?) stack.