Patent ID: 6071159
Filing Date: 2000-06-06
Classification: F01N,F02B,F02F

Abstract:
An internal combustion engine having a cylinder block that defines at least one horizontally extending cylinder bore, a cylinder head affixed to said cylinder block and having a surface that closes said cylinder bore to form a combustion chamber with said cylinder bore and with a piston that reciprocates in said cylinder bore, at least one exhaust passage formed in said cylinder head, said cylinder head exhaust passage extending from said cylinder head surface that closes said cylinder bore and curving in a re-entrant fashion so as to form an exhaust gas opening in a surface of said cylinder head that extends parallel to said surface that closes said cylinder bore, the cylinder block has a portion that is in engagement with the cylinder head surface through which the exhaust passage opens, the cylinder block portion is formed with an exhaust manifold that includes a vertically downwardly extending passage and a runner section that extends from an opening that registers with the cylinder head exhaust gas opening and which terminates in the vertically extending portion, said cylinder block runner section having a first, upper surface that is inclined downwardly toward said vertically extending section from its opening in said cylinder block and which is in line with the upper edge of said cylinder head exhaust passage opening, the lower opening portion of said cylinder block runner passage extending downwardly below said cylinder head exhaust passage opening and extending also to said vertically extending passage in said cylinder block so that said runner section has a tapered configuration that defines an inlet opening that has a greater vertical height than said cylinder head exhaust outlet opening.