Patent ID: 8960137
Filing Date: 2015-02-24
Classification: F01N,F01P,F02B,F02F,Y02T

Abstract:
1. An engine cooling system, comprising: a cast cylinder head including an integrated exhaust manifold that directs exhaust gases to an exhaust outlet port, the integrated exhaust manifold contained within the cylinder head casting; a coolant passage surrounding the exhaust manifold and contained within the cylinder head casting, the coolant passage further having one or more coolant inlets and one or more coolant outlets; a cluster of separated exhaust passages included in the integrated exhaust manifold for directing exhaust gases to the exhaust outlet port, the cluster including a drill hole disposed within material between the exhaust passages, the drill hole fluidically coupled to the coolant passage and spaced away from the inlets and outlets wherein the cluster of separated exhaust passages comprises three exhaust runners including a first exhaust runner coupled to a first cylinder, a second merged exhaust runner coupled to a second cylinder and a third cylinder, and a third exhaust runner coupled to a fourth cylinder, and where a firing order of the cylinders is the first cylinder, the third cylinder, the fourth cylinder, and the second cylinder in sequence; and a second drill hole disposed within material between the exhaust passages.