S85 Engine: Specifications and FAQs
The S85 engine is a high-performance V10 engine developed by BMW for use in its M5 and M6 models. It is known for its remarkable power, precision, and smoothness, making it a favorite among automotive enthusiasts. This engine was introduced in the BMW E60 M5 and the E63/E64 M6, and it remains a symbol of BMW’s engineering prowess.
Specifications of the S85 Engine
- Engine Type:
- Type: Naturally aspirated V10
- Configuration: V10, 90-degree angle between banks
- Material: Aluminum alloy block and DOHC (Double Overhead Camshaft)
- Displacement:
- Total Displacement: 4.9 liters (4,999cc)
- Performance:
- Power Output: 500 horsepower at 7,750 RPM
- Torque: 384 lb-ft (520 Nm) at 6,100 RPM
- Redline: 8,250 RPM (with an electronically limited top speed of around 155 mph/250 km/h)
- Fuel System:
- Fuel Type: Premium unleaded gasoline
- Fuel Delivery: Multi-point fuel injection (MPI)
- Compression Ratio:
- Ratio: 12.0:1
- Induction System:
- Type: Naturally aspirated (no turbocharging or supercharging)
- Intake System: Individual throttle bodies, optimized for performance
- Transmission Compatibility:
- Transmission Type: 6-speed manual or 7-speed SMG (Sequential Manual Gearbox)
- Final Drive Ratio: 3.62:1
- Cooling System:
- Coolant System: Liquid-cooled, optimized for high-performance output
- Dimensions:
- Length: Approximately 750mm
- Width: 720mm
- Height: 650mm
- Weight: Roughly 220 kg (485 lbs)
- Exhaust:
- Exhaust System: Dual exhaust with tuned headers for enhanced sound and performance.
Key Features:
- High-Revving Nature: The S85 is known for its ability to rev to extremely high RPMs, offering a thrilling experience when pushed to its limits.
- Individual Throttle Bodies: Each of the 10 cylinders has its own throttle body, ensuring maximum performance and throttle response.
- Advanced V10 Technology: BMW’s engineers designed the S85 engine to deliver an almost perfect balance between power, efficiency, and reliability, providing a truly exceptional driving experience.
FAQs About the S85 Engine
1. What is the S85 engine used in?
The S85 engine was predominantly used in BMW’s high-performance models, specifically the E60 M5 (produced from 2005-2010) and the E63/E64 M6 (produced from 2006-2010). These cars were part of the BMW M series, designed to offer both daily driving comfort and track-worthy performance.
2. How powerful is the S85 engine?
The S85 engine delivers an impressive 500 horsepower at 7,750 RPM and 384 lb-ft (520 Nm) of torque at 6,100 RPM. This power output enables the M5 and M6 to accelerate from 0-60 mph (0-100 km/h) in under 5 seconds.
3. Is the S85 engine reliable?
While the S85 engine is generally considered a high-performance powerhouse, it has faced some issues over the years. Common problems include the throttle actuator failures, Vanos (variable valve timing) issues, and, in some cases, oil consumption. These problems have been documented by owners but are often addressed with proper maintenance and repairs.
4. How long will an S85 engine last?
With proper maintenance, the S85 engine can last over 150,000 miles. However, due to its high-revving nature, regular oil changes, and attention to mechanical components like the throttle actuators and Vanos system, are critical to prolonging its life.
5. Does the S85 engine require high maintenance?
Yes, the S85 engine requires more attention than a standard engine due to its complexity and performance nature. Regular maintenance such as oil changes, inspection of the Vanos system, and addressing issues like throttle actuator failures will help ensure the engine runs smoothly.
6. Is the S85 engine available in other BMW models?
The S85 engine was exclusive to the BMW M5 and M6 models during its production run. It was not used in other BMW models but remains a cornerstone of BMW’s M series history for its performance and engineering excellence.
7. How does the S85 compare to other BMW M engines?
The S85 is often considered one of the most advanced engines from BMW’s M division. It has a higher-revving capability and a more complex design compared to the previous M engines like the S54 (inline-six in the E46 M3). Compared to modern M engines, the S85’s V10 nature offers a unique, raw driving experience that is difficult to match in modern turbocharged models.
8. What are some aftermarket modifications for the S85 engine?
Many enthusiasts choose to upgrade the S85 engine with performance enhancements, including:
- Cold air intakes for increased airflow
- Upgraded exhaust systems to enhance sound and performance
- Performance chips or ECU tuning for optimized power output
- High-performance camshafts to improve valve timing and power
9. Can the S85 engine be used in racing?
Yes, the S85 engine, with its high-revving characteristics and power, is capable of being used in racing, particularly in events where high RPMs and top-end performance are required. However, racing versions of the engine often require modifications for durability under extreme conditions.
10. What is the fuel economy of the S85 engine?
The S85 engine is designed for performance rather than fuel economy. Typically, the E60 M5 equipped with the S85 engine averages around 14-15 mpg (miles per gallon) in mixed driving conditions. Highway driving can improve the economy slightly, but it remains relatively low due to the engine’s performance-focused nature.
Conclusion
The S85 engine is a remarkable piece of engineering that stands as a testament to BMW’s commitment to performance and innovation. Found in the E60 M5 and E63/E64 M6, it offers an exhilarating driving experience with its 10-cylinder configuration and high-revving potential. While it does require more maintenance than standard engines, its power and thrill make it a favorite among enthusiasts. Whether you’re considering owning a car with an S85 engine or simply an admirer of high-performance engines, the S85 remains an iconic engine in BMW’s history.
