The development of the Dieselmax and Ecomax engine range is typical of JCB's reputation for innovation and quality. Focusing on core customer values and resulted in a 'best in class' engine for mid-range off-highway equipment.
| Maximum rating (gross intermittent) | 63kW (84hp) |
| At speed | 2200 rpm |
| Peak Torque | 320 Nm (236 lb-ft) |
| Peak Torque Speed | 1200 rpm |
| Maximum no load governed speed | 2420 rpm |
| Nominal Idling Speed | 800 rpm |
| Thermodynamic Cycle |
Diesel 4 Stroke |
| Air Intake | NA |
| Arrangement | 4.4L |
| Nominal bore | 103 mm (4.06") |
| Stroke | 132 mm (5.20") |
| Maximum rating (gross intermittent) | 74kW (100hp) |
| At speed | 2200 rpm |
| Peak Torque | 425 Nm (313 lb-ft) |
| Peak Torque Speed | 1300 rpm |
| Maximum no load governed speed | 2420 rpm |
| Nominal Idling Speed | 800 rpm |
| Thermodynamic Cycle |
Diesel 4 Stroke |
| Air Intake | TC |
| Arrangement | 4.4L |
| Nominal bore | 103 mm (4.06") |
| Stroke | 132 mm (5.20") |
Turbocharged Aftercooled 4 cylinder 4.4 litre engine with maximum torque of 525Nm (387 lb-ft)
| Maximum rating (gross intermittent) | 93kW (125hp) |
| At speed | 2200 rpm |
| Peak Torque | 525 Nm (387 lb-ft) |
| Peak Torque Speed | 1300 rpm |
| Maximum no load governed speed | 2420 rpm |
| Nominal Idling Speed | 800 rpm |
| Thermodynamic Cycle |
Diesel 4 Stroke |
| Air Intake | TCA |
| Arrangement | 4.4L |
| Nominal bore | 103 mm (4.06") |
| Stroke | 132 mm (5.20") |
Stage V Turbocharged Aftercooled Electronic 4 cylinder 3.0/4.8 litre engine with maximum torque of 690Nm (509 lb-ft)
Tier 4 Turbocharged Aftercooled Electronic 4 cylinder 3.0 litre engine with maximum torque of 440Nm (325 lb-ft)
Stage IIIA/Tier 3 Turbocharged Aftercooled 4 Cylinder 4.4 litre engines with maximum torque of 657Nm (485 lb-ft)