The 4JA engine is one of Isuzu's most reliable and well-known diesel engines, renowned for its simple, mechanical construction and its ability to use a Direct Injection system without heavy reliance on electronic components.
1. Type and Configuration: 4-stroke, 4-cylinder in-line diesel engine with OHV (Overhead Valve) configuration, known for its ease of maintenance.
2. Capacity (Displacement): 2,499 cc (2.5 liters).
3. Bore × Stroke: 93 mm × 92 mm.
4. Combustion System: Direct Injection with a mechanical injection pump (In-line Plunger or VE Distributor), making it highly tolerant of varying fuel quality.
5. Air Induction: Available in two main variants: 4JA: Naturally Aspirated (Non-Turbo). 4JA-L or 4JA-T: Equipped with a Turbocharger (low-pressure).
6. Power and Torque Output: Typical values (may vary depending on tuning and the presence/absence of a turbo):
Maximum Power: Approximately 73 PS to 90 PS (at around 3,500 to 4,200 rpm).
Maximum Torque: Approximately 160 Nm to 191 Nm (at around 1,800 to 2,400 rpm).
Primary Applications:
Isuzu light-duty trucks such as the Isuzu Elf NHR/NKR (older versions).
Passenger and light commercial vehicles: Isuzu Panther (Indonesia and Southeast Asia), Isuzu KB250, Isuzu D-Max (early models), and Isuzu Trooper (certain models).
Dimensions and Weight (Estimated):
- Length × Width × Height: Approximately 805 mm × 625 mm × 729 mm.
- Dry Weight: Relatively light, approximately 218 kg to 239 kg.
