BMW S38 Engine Specifications
The BMW S38 engine is a high-performance inline-six engine that has garnered a reputation for its robust engineering and impressive power output. This engine was primarily used in the BMW M5 and M6 models during the late 1980s and early 1990s. Below are the detailed specifications of the S38 engine.
| Specification | Details |
|---|---|
| Engine Type | Inline-6, DOHC |
| Displacement | 3.5 L (3,430 cc) |
| Bore x Stroke | 86 mm x 85 mm |
| Compression Ratio | 10.0:1 |
| Maximum Power | 282 hp (210 kW) at 6,500 rpm |
| Maximum Torque | 251 lb-ft (340 Nm) at 4,750 rpm |
| Fuel System | Multi-point fuel injection |
| Ignition System | Electronic ignition |
| Cooling System | Water-cooled |
| Weight | Approx. 200 kg (440 lbs) |
Engine Configuration
The S38 engine features a classic inline-six configuration, which is known for its smooth operation and balanced performance. The design includes:
- Double Overhead Camshafts (DOHC): This setup allows for precise control of the intake and exhaust valves, improving efficiency and performance.
- Multi-Point Fuel Injection: Enhances fuel atomization and combustion efficiency, contributing to the engine’s power output.
- High Compression Ratio: The 10.0:1 compression ratio allows for better thermal efficiency, resulting in increased power and torque.
- Robust Construction: The engine block and components are designed to withstand high performance and stress, making it suitable for both street and track applications.
Engine Oil Specifications
Proper lubrication is crucial for the longevity and performance of the BMW S38 engine. The following specifications outline the recommended engine oil and its properties.
| Specification | Details |
|---|---|
| Oil Type | Synthetic motor oil |
| Viscosity Rating | SAE 10W-40 |
| Oil Capacity | Approx. 6.5 liters (6.9 quarts) |
| Oil Filter | OEM or equivalent |
Service Intervals
Regular maintenance is essential to keep the S38 engine performing at its best. Below are the recommended service intervals for oil changes and other maintenance tasks.
- Oil Change: Every 5,000 to 7,500 miles (8,000 to 12,000 km) or annually, whichever comes first.
- Oil Filter Replacement: Replace with every oil change.
- Coolant Change: Every 2 years or 30,000 miles (48,000 km).
- Spark Plug Replacement: Every 30,000 miles (48,000 km).
- Timing Belt Inspection: Every 60,000 miles (96,000 km); replace if necessary.
- Fuel Filter Replacement: Every 30,000 miles (48,000 km).
Conclusion
The BMW S38 engine is a remarkable piece of engineering that combines performance, reliability, and a rich motorsport heritage. Understanding its specifications, configuration, oil requirements, and service intervals is essential for any enthusiast or owner looking to maintain this iconic engine. Regular maintenance and the use of high-quality lubricants will ensure that the S38 continues to deliver an exhilarating driving experience for years to come.
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