APPARATUS FOR DIRECTING THE FLOW OF EXHAUST FLUID WITHIN AN INTERNAL COMBUSTION ENGINE

摘要

An exhaust passage 8 is provided for an internal combustion engine equipped with dual exhaust valves 18 and 19 for each cylinder 12 wherein the passage 8 directs the combination of the two streams formed by the exhaust valve ports 16 into a single stream in a manner to conserve the maximum available energy. Fluid flowing through exhaust ports 16 is directed by a guide vane 54 which has been cast in the exhaust passage 8 wherein vane 54 is formed to contain a keyhole shaped slot 57 to provide clearance for downstream valve stem 21 and to eliminate the disrupting effects which would otherwise result from an oversize clearance hole due to the leading edge effect. Keyhole shaped slot 57 permits unconstrained expansion and contraction of the exhaust passage in response to thermal cycling caused by normal engine operation thereby avoiding the effects of thermal fatigue.