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This SAE Recommended Practice applies to domestic four-cycle air- and water-cooled engines having a maximum of 20 hp (14.9 kW) or less in power output and/or 50 in3 (0.82 L) or less in displacement, with horizontal or vertical crankshafts.

This SAE Recommended Practice specifies a uniform procedure for the evaluation of gaseous exhaust emissions from small utility engines typically less than 20 kW. Details of engine test setup and exhaust gas analysis techniques are specified with the intent of providing a uniform and reproducible method of measurement. The intent has been to allow as much flexibility as possible in the physical construction of the experimental apparatus. Therefore, only those portions of the apparatus whose operation is critical to the accurate measurement of emissions levels are prescribed in detail. An engine test procedure including a test sequence is outlined such that it would cover the various applications in which small engines are used. The intent is to provide an understanding of the levels of exhaust emissions and does not imply that in a given application, an engine would operate in all the modes outlined in the test procedure.

This SAE Recommended Practice was developed to provide a method of recommending the availability of various dimensional output shaft and crankcase flange combinations.

This SAE Standard is applicable to small spark ignition and compression ignition engines, having a maximum of 1.0 L swept volume displacement, powering off-road applications such as lawn and garden, construction, general utility equipment, and off-highway recreational vehicles. It is not intended to cover engines powering on-road vehicles, motorcycles, or boats.

The scope of this SAE Recommended Practice is to provide a uniform practice for the testing of small engine powered alternating current generator sets. This document is limited to reciprocating piston engines of less than 14.9 kW (20 BHP).

The scope of this SAE Recommended Practice is to provide a uniform practice for the testing of small engine powered alternating current generator sets. This document is limited to reciprocating piston engines of less than 14.9 kW (20 BHP).