초록 ▼

A method of testing an internal combustion engine to detect engine defects. After the engine has been assembled, the engine is cranked, gas under pressure is injected into the intake ports, and the pressures developed at the exhaust ports as the engine is cranked are noted and evaluated. The pressur

A method of testing an internal combustion engine to detect engine defects. After the engine has been assembled, the engine is cranked, gas under pressure is injected into the intake ports, and the pressures developed at the exhaust ports as the engine is cranked are noted and evaluated. The pressurized air injected into the intake ports amplifies the pressure signals developed at the exhaust ports so as to provide more accurate identification of engine defects and detect engine defects that might go undetected utilizing prior art technology.

대표청구항 ▼

A method of testing an internal combustion engine to detect engine defects wherein the engine is assembled to provide an engine housing defining a cylinder, a piston mounted for reciprocal movement in the cylinder and coacting with the engine housing to define a combustion chamber, an intake port op

A method of testing an internal combustion engine to detect engine defects wherein the engine is assembled to provide an engine housing defining a cylinder, a piston mounted for reciprocal movement in the cylinder and coacting with the engine housing to define a combustion chamber, an intake port opening in the combustion chamber, an exhaust port opening at one end in the combustion chamber and extending to a location outside of the engine housing, an intake valve coacting with the intake port; an exhaust valve positioned in the opening of the exhaust port into the combustion chamber, and a crankshaft driven in response to reciprocal movement of the piston; the assembled engine is cranked cold without the use of fuel so that no internal combustion occurs during the test; and port pressures are noted and evaluated to detect defects in the assembled engine; characterized in that: the test is performed by delivering pressurized gas to the intake port and noting the exhaust pressures developed on the exhaust port side of the exhaust valve as the engine is cranked; and the exhaust pressures are noted with the exhaust port blocked at a location outside of the engine housing. A method of testing an internal combustion engine to detect engine defects wherein the engine is assembled to provide an engine housing defining a cylinder, a piston mounted for reciprocal movement in the cylinder and coacting with the engine housing to define a combustion chamber, an intake port opening in the combustion chamber, an exhaust port opening at one end in the combustion chamber and extending to a location outside of the engine housing, an intake valve coacting with the intake port, an exhaust valve positioned in the opening of the exhaust port into the combustion chamber, and a crankshaft driven in response to reciprocal movement of the piston; the assembled engine is cranked; and port pressures are noted and evaluated to detect defects in the assembled engine; characterized in that: the test is performed cold without the use of fuel so that no internal combustion occurs during the test; the test is performed by injecting a gas under pressure into the intake port and noting the exhaust pressures developed on the exhaust port side of the exhaust valve as the engine is cranked; and the flow of gas out of the exhaust port is restricted during the test by providing a valve in association with the exhaust port which is independent of and in addition to the exhaust valve and which may be closed to totally block the exhaust port so as to increase the pressures at the exhaust port.