SKU: CB055-6001
Vehicle Fitment & Product Details
- Type: Engines & Engine Parts
- Vendor: CarBahn
- Make: BMW
- Model(s): M2 CS, M2 Competition, M3, M3 CS, M3 Competition, M4, M4 CS, M4 Competition, and M4 GTS
- Vehicle Year(s): 2015, 2016, 2017, 2018, 2019, and 2020
- Chassis: F80, F82, F83, and F87
- Body Style(s): Convertible, Sedan, and Coupe
- Part Number: CB055-6001
- Fits Engines: S55
The CarBahn Stage 1 S55 engine is designed for high-performance applications, particularly for BMW F80 M3, F82/F83 M4, and F87 M2C models, and is rated for handling substantial power outputs, including larger turbo setups. This engine is an excellent upgrade for those seeking a significant boost in performance while maintaining the reliability required for daily driving and track use.
Engine components include forged Carrillo connecting rods, forged CP pistons, and a CarBahn pinned crankshaft, which ensures the cam sprocket is securely fixed to the crankshaft to prevent timing issues. The engine also features a full circle main bearing for enhanced durability, high-performance valve springs, and the labor and machine work needed to install these upgraded parts into the block.
The S55 engine is typically not designed to handle large increases in boost beyond OEM specifications. This limitation stems from the design of the crankshaft, where the timing chain sprocket can spin on the end of the crank, causing the camshafts to fall out of time. In extreme cases, this could lead to catastrophic damage, such as valve-to-piston contact. Additionally, the S55 engine uses only half of a standard crankshaft thrust bearing, which can lead to reliability concerns under higher performance conditions. To address these issues, CarBahn pins the timing chain sprocket to the crankshaft and machines the block to accommodate a full-circle thrust main bearing, ensuring optimal performance and durability.
The CarBahn S55 engine is specifically optimized for high boost settings, featuring a reduced compression ratio by 0.5 points compared to the OEM engine. This modification helps to improve performance by allowing for more fuel-air mixture in the combustion chamber and preventing the ignition timing from retarding too much under increased boost pressure. This lowered compression also offers the added benefit of reducing catalyst inlet temperatures, improving driveability on pump gas, and ensuring emissions-legal operation on the street.
With a strong legacy in performance engineering, Steve Dinan and his team have been building high-performance BMW engines for over 46 years, with extensive racing experience, including 12 racing championships and two 24 Hours of Daytona victories. CarBahn’s engineering expertise ensures that the S55 high-performance engine is not only capable of withstanding extreme power levels but is also a far more durable and cost-effective alternative to the OEM factory engine.
All CarBahn engines come with a two-year warranty. Please ensure that the core is complete (from oil pan to valve cover) and meets the engine core acceptance parameters to avoid additional repair charges.
Engine Core Acceptance Criteria:
- Must be a complete factory engine.
- No holes or cracks in the block or heads.
- Bore damage must be repairable by honing.
- No damage to thrust or journal surfaces, and bolt holes must be repairable.
- Components such as valves, crankshafts, camshafts, guides, ValveTronic, and Vanos mechanisms must be in working condition.
The CarBahn S55 engine is built to push your vehicle to the next level of performance while ensuring long-lasting reliability. This high-performance engine package is designed for serious enthusiasts looking to upgrade their BMW’s power output, offering a robust solution for high-boost applications with race-winning heritage.