This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist.

This SAE Recommended Practice has been adopted by SAE to specify: a. A basis for net engine retarder power rating; b. Reference inlet air test conditions; c. A method for correcting observed engine retarder power to reference conditions; d. A method for determining net engine retarder power with a dynamometer.

This test code document is applicable to engine exhaust retarders on four-stroke compression ignition (CI), with and without charge air cooling. This document does not apply to aircraft, marine, spark ignition (SI), two-stroke compression ignition (CI) or mechanical super-charged ignition engines, compression release retarders, or combination exhaust and compression release retarders.