This SAE Standard has been adopted to provide a basis for dynamometer determination of gross engine power and torque under reference conditions. It is intended for use primarily by engine manufacturers who supply engines for installation by others in applications where the engine manufacturer may not control the induction and exhaust system design or the speed at which the engine is run.
Field of Application
This test code document is applicable to both four-stroke and two-stroke spark ignition (SI) and compression ignition (CI) engines, naturally aspirated and pressure charged, with and without charge air cooling. This document does not apply to aircraft or marine engines.
The corresponding test code for net as installed power and torque rating is SAE J1349.
The document for mapping engine performance is SAE J1312.
Relationship to ISO 2534
ISO 2534 (1972) differs from SAE J1995® in several areas, among which the most important are:
a. This document is not limited to road vehicles.
b. This document requires inlet fuel temperature be controlled to 40 °C on CI engines with fixed displacement injection systems.
c. This document includes a reference fuel specification for both SI and CI engines.
d. This document includes a different procedure for testing engines with a laboratory charge air cooler (ISO method optional).
e. This document includes a different procedure for correcting power to reference atmospheric conditions on turbocharged CI engines.
Complete correlation has not been established with ISO 3046. It is expected that this power test code will eventually align with ISO 2534.