| Subject | English | Spanish |
| mech.eng. | axial piston engine | motor de cilindro axial |
| industr. | compression-ignition internal combustion piston engine | motor de émbolo de encendido por compresión |
| tech. | engine piston rod | vástago de émbolo del motor |
| mech.eng. | engine with opposite pistons | motor de émbolos opuestos |
| mech.eng. | free piston engine | motor de pistón libre |
| econ., transp., mech.eng. | free-piston engines | motor de pistones libres |
| coal. | haulage engine with piston motor | cabrestante de pistón |
| mech.eng. | internal combustion piston engine | motor de explosión de émbolos |
| transp., mech.eng. | internal combustion piston engine | motor de combustión interna de pistones |
| transp., avia. | multiple piston-engined aeroplane | avión multimotor de pistón |
| mech.eng. | opposed piston engine | motor de cilindros horizontales opuestos |
| mech.eng. | opposed piston engine | motor de embonos opuestos |
| transp. | piston engine | motor de émbolo |
| gen. | pistons for engines | pistones de motores |
| transp. | pump housings or bodies of steel other than stainless steel for aircraft piston engines | cuerpos de bomba de acero no inoxidable para motores de émbolo para aviación |
| transp., mech.eng. | reciprocating piston engine | motor alternativo |
| transp., mech.eng. | reciprocating piston engine | motor de émbolo alternativo |
| transp., industr. | rotary internal combustion piston engine | motor de émbolo rotativo |
| transp., industr. | rotary internal combustion piston engine | motor de émbolo rotativo de encendido por chispa |
| mech.eng. | rotary piston engine | motor de pistón rotativo |
| transp., industr. | rotary piston engine | motor rotativo a pistón |
| transp., industr. | rotary piston engine | motor de émbolo rotatorio |
| transp., mech.eng. | rotary piston engine | motor de pistones rotativos |
| transp., industr. | rotating piston engine | motor de émbolo rotatorio |
| transp., industr. | rotating piston engine | motor rotativo a pistón |
| transp., avia. | single piston engine | motor de un solo pistón |
| transp., avia. | single piston engine | motor de pistón único |
| transp., avia. | single piston-engined aeroplane | avión monomotor de pistón |
| transp., industr. | spark-ignition internal combustion piston engine | motor de émbolo de encendido por chispa |
| transp., industr. | spark-ignition reciprocating internal combustion piston engine | motor de émbolo alternativo de encendido por chispa |
| transp., industr. | spark-ignition reciprocating piston engine | motor de émbolo alternativo de encendido por chispa |
| transp., industr. | spark-ignition rotary internal combustion piston engine | motor de émbolo rotativo de encendido por chispa |