SAE J643

Description / Abstract: The range of test conditions on the dynamometer shall be sufficient to determine the primary operating characteristics corresponding to the full range of vehicle operations.

The characteristics to be determined are:

a. Torque ratio versus speed ratio and output speed

b. Input speed versus speed ratio and output speed

c. Efficiency versus speed ratio and output speed

d. Capacity factor versus speed ratio and output speed

e. Input torque versus input speed

NOTE: For more information about these characteristics and the design of hydrodynamic drives, see "Design Practices— Passenger Car Automatic Transmissions," SAE Advances in Engineering, AE18 or AE29

Purpose

This code provides a means of determining operating characteristics of hydrodynamic drives used in motor vehicle installations. It outlines a series of dynamometer tests and provides a method of presenting data from these tests. The results obtained are complete enough to provide a basis for estimating vehicle performance. Other special tests, such as centrifugal bursting, heat rejection, extreme temperature, cavitation, and charging pressure, may be required to evaluate the unit for particular applications or conditions.