BS ISO 9249:2007

1   Scope This International Standard specifies a method for testing the net power of internal combustion engines intended for the propulsion of earth-moving machinery as defined in ISO 6165. It is intended to provide a standardized means of reporting net power values to the end user of the earth-moving machines. It is applicable to

       a)  RIC spark- or compression-ignition engines but excluding free piston engines, 
   
   
     
       b)  rotary piston engines. 
   
 

These engines may be naturally aspirated or pressure-charged using either a mechanical pressure-charger or a turbocharger.

   NOTE  This International Standard is a companion standard to [ISO 14396](/search?q=ISO%C2%A014396). The principle differences between the two is the fitting of certain cooling equipment and pressure-charging equipment auxiliaries (fans) for the test. It is possible to deduct the power requirements of equipment and auxiliaries from the engine ratings of [ISO 14396](/search?q=ISO%C2%A014396) by test or calculation methods. See Annex A for the preferred calculation method for obtaining the  net power  ratings according to this International Standard. Both the test and the calculation method comply with this International Standard.