BMW M42 Engine Overview
The BMW M42 engine is a notable four-cylinder inline engine that was produced by BMW from 1989 to 1996. It is known for its performance and efficiency, making it a popular choice for various BMW models during its production run. The M42 engine is part of BMW’s M series, which signifies a focus on performance-oriented engineering.
Engine Specifications
The M42 engine is recognized for its robust design and advanced technology for its time. Below is a detailed specification chart that outlines the key features of the BMW M42 engine.
| Specification | Details |
|---|---|
| Engine Type | Inline 4-cylinder |
| Displacement | 1.8 liters (1796 cc) |
| Power Output | 136 hp (101 kW) at 6,500 rpm |
| Torque | 128 lb-ft (174 Nm) at 4,800 rpm |
| Compression Ratio | 10.5:1 |
| Fuel System | Multi-point fuel injection |
| Valvetrain | DOHC, 4 valves per cylinder |
| Bore x Stroke | 80 mm x 86 mm |
| Weight | Approximately 120 kg (265 lbs) |
| Applications | BMW E30 318i, E36 318i, Z3 1.8, and others |
Engine Configuration
The BMW M42 engine features a well-engineered configuration that contributes to its performance and reliability. Here are some key aspects of its configuration:
Design Features
- Inline 4-cylinder layout for compactness and balance.
- Double overhead camshaft (DOHC) design for improved airflow and efficiency.
- Four valves per cylinder, enhancing combustion and power output.
- Multi-point fuel injection system for precise fuel delivery.
Performance Characteristics
- High-revving nature, capable of reaching 6,500 rpm.
- Responsive torque delivery, making it suitable for spirited driving.
- Good fuel efficiency for a performance engine.
Engine Oil Specifications
Proper lubrication is crucial for the longevity and performance of the BMW M42 engine. The following specifications outline the recommended engine oil types and service intervals.
Recommended Engine Oil
- Viscosity: 10W-40 or 15W-40 for general use.
- API Rating: API SG or higher.
- Oil Type: Synthetic or conventional oil can be used, but synthetic is preferred for better performance and protection.
Oil Capacity
- Oil Capacity (with filter): Approximately 4.5 liters (4.8 quarts).
Service Intervals
Regular maintenance is essential to keep the BMW M42 engine running smoothly. Below are the recommended service intervals for oil changes and other maintenance tasks.
Oil Change Intervals
- Every 5,000 to 7,500 miles (8,000 to 12,000 km) or every 6 months, whichever comes first.
Other Maintenance Tasks
- Replace oil filter with every oil change.
- Check and replace air filter every 15,000 miles (24,000 km).
- Inspect spark plugs every 30,000 miles (48,000 km) and replace as necessary.
- Check coolant levels and condition every 30,000 miles (48,000 km).
- Inspect belts and hoses for wear every 30,000 miles (48,000 km).
Conclusion
The BMW M42 engine is a remarkable piece of engineering that exemplifies BMW’s commitment to performance and reliability. With its advanced design, efficient fuel system, and well-balanced configuration, the M42 remains a favorite among enthusiasts. Regular maintenance and adherence to oil specifications are crucial for ensuring the engine’s longevity and optimal performance. Whether in a classic E30 or a Z3, the M42 engine continues to deliver an engaging driving experience.
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