M274 vs B48 Engine Comparison
M274 and B48 are both 2.0L inline-four turbocharged engines from Mercedes-Benz and BMW, respectively. They differ in structure, performance, technology, and reliability. Below is a detailed comparison:
1. Basic Specifications
| Specification | Mercedes M274 | BMW B48 |
|---|---|---|
| Displacement | 2.0L | 2.0L |
| Cylinder Arrangement | Inline-four | Inline-four |
| Turbocharging | Single turbo | Single turbo (twin-scroll) |
| Fuel Injection | Direct + Port Injection | Direct Injection |
| Max Power | 135-180 kW (181-241 hp) | 115-225 kW (154-302 hp) |
| Max Torque | 300-370 Nm | 250-450 Nm |
| Compression Ratio | 9.8:1 | 11:1 |
| Block Material | Aluminum | Aluminum |
| First Used In | 2013 (W205 C-Class) | 2014 (F56 Mini, F30 3-Series) |
2. Structure & Technology
| Feature | Mercedes M274 | BMW B48 |
| Turbocharger | Single turbo | Twin-scroll turbo |
| Variable Valve Timing | Dual VVT (Intake & Exhaust) | Valvetronic + Double VANOS |
| Fuel Injection | Direct + Port Injection | Direct Injection only |
| Cooling System | Water-cooled + Oil-cooled | Water-cooled + Oil-cooled |
| Engine Balancing | Balance shaft | Balance shaft |
| Lightweight Design | Aluminum structure | Aluminum structure |
Technology Comparison
BMW B48’s Valvetronic System
B48 uses Valvetronic variable valve lift, allowing throttle-less control for better fuel efficiency and response.
M274 relies on traditional throttle control and does not eliminate throttle entirely.
BMW B48’s Twin-Scroll Turbo
B48 utilizes Twin-Scroll turbocharging, reducing turbo lag and improving low-end torque.
M274 uses a single turbo setup, delivering stronger power at higher revs but slightly weaker low-end performance.
Mercedes M274’s Dual Injection System
M274 combines Port Injection (MPI) and Direct Injection (DI) to reduce carbon buildup.
B48 only uses Direct Injection, leading to potential carbon buildup over time, requiring periodic cleaning.
3. Performance & Transmission
| Model | Mercedes M274 (C-Class, GLC, etc.) | BMW B48 (3-Series, X3, MINI, etc.) |
| Low Power Version | C200 (184 hp, 300 Nm) | 320i (154-181 hp, 250-300 Nm) |
| Mid Power Version | C250 (208 hp, 350 Nm) | 330i (241 hp, 400 Nm) |
| High Power Version | C300 (241 hp, 370 Nm) | 330i High Output (255 hp, 400 Nm) |
| Transmission | 7G-Tronic / 9G-Tronic (later models) | 8-speed ZF (ZF 8HP) |
M274 with Mercedes’ 9G-Tronic offers smooth shifting but may have slight low-speed hesitation.
B48 with ZF 8HP shifts quickly, offers smoother low-speed performance, and is more fuel-efficient.
- Conclusion: Which One is Better?
For reliability and durability → Mercedes M274 is the better choice for long-term use.
For performance and driving experience → BMW B48 offers better high-rev power and sportier performance.
For lower maintenance costs → M274 is easier to maintain, while B48 requires frequent carbon cleaning.
Overall, M274 is great for stability and longevity, while B48 excels in sporty performance but needs more maintenance. Which one do you prefer?