Dual induction system for internal combustion engine

Claim 1

A multicylinder reciprocating internal combustion engine with a dual induction system, with said engine comprising: at least one exhaust poppet valve and a single intake poppet valve for each cylinder, with the intake valve being located so as to control the flow of charge into the cylinder; a plurality of intake ports for conducting fresh charge to each intake valve, with each of said ports having a vertical dividing wall seperating the port into primary and secondary passages, with the primary passage being oriented so as to cause rotational flow about the outermost portion of the cylinder, and the secondary passage being oriented so as to cause flow directed about a radially inward portion of the cylinder; a secondary throttle valve located within each of said secondary passages, for selectively controlling the flow therethrough; an intake plenum having at least one throttled charge air inlet and a plurality of primary and secondary outlets; a low-speed intake runner extending from each of said primary outlets to one of said primary port passages wherein the multiple cylinders of the engine are arranged in a two-bank, V configuration, with said intake plenum comprising two separate volumes situated between the banks and extending parallel to the engine's longitudinal axis, with the primary outlets of each volume feeding the low-speed runners of the adjacent cylinder bank and with the secondary outlets of each volume feeding the high-speed runners of the opposite cylinder bank.