The BMW S55 engine is a high-performance, twin-turbocharged inline-six engine developed by BMW M GmbH. It’s renowned for its impressive power output, responsiveness, and robust design, making it a favorite among enthusiasts. This engine was specifically designed for use in several high-performance BMW models. Let’s delve into the specific vehicles that harnessed the power of the S55 and explore its key features.
Vehicles Equipped with the S55 Engine
The S55 engine was primarily found in the following BMW models. Understanding which cars used this engine helps you identify vehicles known for their exceptional driving dynamics.
- BMW M3 (F80): Produced from 2014 to 2018, the F80 M3 was the first car to feature the S55 engine.
- BMW M4 (F82/F83): Available as a coupe (F82) and convertible (F83), the M4 also used the S55 engine from 2014 to 2020.
- BMW M2 Competition (F87): The M2 Competition, introduced in 2018, replaced the standard M2’s N55 engine with the more powerful S55.
S55 Engine Specifications: A Detailed Look
The S55 boasts impressive specifications that contribute to its high performance. Here’s a table outlining key details:
| Specification | Value |
|---|---|
| Engine Type | Inline-Six, Twin-Turbocharged |
| Displacement | 2,979 cc (3.0 L) |
| Bore x Stroke | 84 mm x 89.6 mm |
| Compression Ratio | 10.2:1 |
| Maximum Power | 425 hp (317 kW) at 5,500-7,300 rpm (Standard) 444 hp (331 kW) at 7,000 rpm (Competition Package) |
| Maximum Torque | 406 lb-ft (550 Nm) at 1,850-5,500 rpm |
| Redline | 7,600 rpm |
S55 Engine Variants and Power Output
While the core S55 engine remained largely consistent across models, slight variations in tuning and components resulted in different power outputs. The Competition Package, for example, offered a noticeable boost.
- Standard S55: Found in the base M3 and M4 models, producing 425 horsepower.
- S55 Competition Package: Available as an option for the M3 and M4, and standard on the M2 Competition, boosting power to 444 horsepower.
- S55 CS Variants: Limited edition models (M3 CS and M4 CS) featured further optimized versions of the S55 engine.
S55 Engine: Advantages and Considerations
The S55 engine provides a unique driving experience, but it’s important to understand both its strengths and potential drawbacks.
Advantages:
- High Power Output: Provides exhilarating acceleration and performance.
- Responsive Turbocharging: Minimizes turbo lag for a more immediate throttle response.
- Robust Design: Built for high-performance applications and track use.
- Tunability: Offers significant potential for aftermarket tuning and performance upgrades.
Considerations:
- Maintenance: Requires regular maintenance, including oil changes and spark plug replacements, to ensure optimal performance and longevity.
- Potential Issues: Some owners have reported issues with the crank hub, especially in heavily modified vehicles.
FAQ: Common Questions about the BMW S55 Engine
Q: What is the difference between the S55 and N55 engines?
A: The S55 is a high-performance engine designed specifically for M cars, featuring upgraded components, twin turbos, and higher power output. The N55 is a more mainstream engine used in a wider range of BMW models.
Q: Is the S55 engine reliable?
A: The S55 is generally considered a reliable engine when properly maintained. However, the crank hub issue is a known potential weakness, particularly in tuned engines.
Q: Can the S55 engine be easily tuned?
A: Yes, the S55 engine is highly tunable, and many aftermarket options are available to increase power and performance. However, tuning can potentially affect reliability.
Q: What are the common problems with the S55 engine?
A: The most commonly reported issue is the crank hub failure, which can occur under high stress or with increased power output. Other potential issues include oil leaks and turbocharger problems.
The BMW S55 engine is a true testament to BMW M’s engineering prowess, delivering exceptional performance and driving pleasure in the M3, M4, and M2 Competition models. Its twin-turbocharged inline-six configuration, high power output, and responsive nature make it a favorite among enthusiasts. While regular maintenance is essential to ensure its longevity, the S55 offers a thrilling driving experience that few other engines can match. For those seeking a high-performance BMW, models equipped with the S55 engine represent a compelling choice. Ultimately, the S55 remains a benchmark for performance engines in its class. The experience behind the wheel is what matters most.
