Patent ID: 8733088

Claim:
An exhaust manifold system comprising: a plurality of runners extending perpendicular to a longitudinal manifold axis; an outlet passage distal from the runners and terminating with a manifold flange; and a coolant jacket not adjacent the runners including: a coolant inlet and outlet for coupling to a coolant system; and a collar coupling the coolant inlet and outlet, the collar adjacent and surrounding the outlet passage, adjacent the manifold flange, and decoupled from the runners, the collar including only a first flow path and a second flow path defined by an interior of the collar, the first and second flow paths collectively surrounding a circumference of the outlet passage, the collar including a smooth interior surface, the first flow path including a first collar profile, the second flow path including a second collar profile and the coolant inlet having an inlet profile, a cross-sectional area of the first and second collar profiles less than a cross-sectional area of the inlet profile, where the coolant jacket further includes a diverter rib extending into an interior of the coolant jacket collar, the diverter rib extending toward the coolant outlet where the first and second flow paths meet.