Abstract: A system for testing an engine, the engine including, a drive shaft, and a fluid circulation subsystem, the fluid circulation subsystem having at least one heat exchanger, and a fresh water pump (engine auxiliary water pump). The portable engine test tool can couple to the engine flywheel housing or output shaft of the transmission and can use the fresh water pump of an engine to provide water to an attached or integrated dynamometer and provide braking force to such. In some embodiments the portable engine testing system can use a fresh water supply reservoir.

Abstract: A motorized chassis dynamometer machine. In one embodiment, the dynamometer machine includes a fixed frame assembly. At least one roller assembly is mounted on the fixed frame assembly. At least one independent motor assembly is connected to each roller assembly. The independent motor assembly is used for driving the roller assembly. At least one independent loading dynamometer assembly capable of measuring the vehicle input power at each roller assembly is coupled to each roller assembly. In a preferred embodiment, the dynamometer assembly is only operable for loading each independent roller assembly, while the motor assembly is operable for driving each independent roller assembly. The machine has at least one motor controller capable of controlling each independent motor assembly and at least one dynamometer controller capable of controlling each independent dynamometer assembly.