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Enactment and enforcement of stringent smoke emission regulations has created need for a method to determine if the exhaust opacity of in-service vehicles exceeds legal limits as they are driven on the road. This can be accomplished by running a 3 min chassis dynamometer test cycle, which is based upon the Environmental Protection Agency diesel engine certification procedure. Simultaneous recordings of speed and exhaust opacity permit modal analysis for identification of specific malfunctioning components and consequent improved cost effectiveness of maintenance expenditures.

This is a discussion of the need for dynamometers to measure engine performance, and the basic principles for determining torque, horsepower, and the application of both engine and chassis dynamometers in the service industries. Specific results show the need for dynamometer testing in quality service, the profit that can be enjoyed, and the ultimate customer satisfaction.