Patent ID: 7146807

Claim:
An internal combustion engine system comprising: an engine block cooled by liquid coolant; an exhaust manifold attached to the engine block, the manifold having an exhaust port fitting spaced apart from the engine block; an exhaust pipe, having an end for connecting to said exhaust port fitting, for carrying away engine exhaust gases which flow from the engine block and through said manifold; and, a heat shield having a concave portion, at least partially enveloping the manifold, the interior of said concave portion spaced apart from the manifold by an air gap, for receiving heat from the manifold; cooling passageways, upon or within the heat shield, for carrying away heat received by said concave portion; and, means for mounting the heat shield with respect to the exhaust manifold without any heat-transfer conductive contact with the manifold upstream of said exhaust port fitting.