The electric dynamometer test of the Pierce arrow engine

THE electric dynamometer is now generally recognized as the standard equipment for testing automobile engines. Dynamometers are used not only to measure the power of the engine in the final test but also are employed as tools in the production of the engine. Engines when first assembled are “run in” on block test dynamometers until the bearings, etc., are worked in. In this process the dynamometer runs as a motor delivering power to the engine. When the friction load on the engine has been reduced to the proper value as determined by a meter on the dynamometer control panel, the engine is fired and drives the dynamometer as a generator returning current to an absorption resistance or to the plant system, thus providing a load for the engine. The engine is tested for power one with this artificial load.