To provide an engine collecting pipe and its manufacture in which manufacturing man-hour is little, productivity is superior, and durability is also superior.
An engine collecting pipe 1 is provided with plural introduction pipes 2 which lead exhaust gas from respective cylinders of an engine, and an exhaust pipe 3 which is provided in a form of collecting the exit sides of the plural introduction pipes 2 into one pipe and collecting exhausts the exhaust gas from the respective introduction pipes 2. The introduction pipes 2 and the exhaust pipe 3 are integrally formed by precision casting of carbon steel, stainless steel, titanium or titanium alloy, or the like. As a precision casting method, a method using both lost wax process and reduced pressure suction casting method can be adopted.
KAGAMI KIKUO
SUGITANI KATSUYUKI
