Stage 2 B58 High Performance Engine (B30B 2WD) | BMW M240i/M340i/M440i/Z4M40i
Vehicle Fitment & Product Details
- Type Engine
- Make BMW
- Model(s) M240i, M240i xDrive, M340i, M440i, and Z4 M40i
- Vehicle Year(s) 2020, 2021, 2022, 2023, and 2024
- Body Style(s) Coupe, Roadster, Sedan, and Convertible
- Part Number CBB58-6205
- Fits Engines B58
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This B58 engine is designed to make for maximum power applications (over 1,000HP) CarBahn has designed a high-performance engine to handle very high outputs by pinning the cam sprocket to the crankshaft. To ensure durability we also machine the block to accommodate a full circle thrust main. In addition, we utilize higher quality racing Carrillo connecting rods, forged CP pistons, cylinder head studs, high performance valve springs, cylinder head porting and lowered compression for increased flow and high boost.
The stock engine compression ratio is relatively high due to the Corporate Average Fuel Economy (CAFE) standards which push for consistently higher fuel economy in cars and trucks. However, this increased compression limits engine performance with higher boost settings by decreasing the size of the fuel-air charge in the combustion chamber, forcing the ignition timing to retard far below MBT (mean best timing, the theoretical optimal ignition timing). Therefore, the Carbahn B58 engine has 0.5 less compression to optimize the engine for the increased boost.
The CarBahn engine is both stronger and less expensive than the BMW OEM factory engine. The B58 CarBahn engine is designed to improve the strength of your engine if you are tuning your car. Connecting rods are replaced with Carrillo forged racing rods. Pistons are CP forged racing pistons. The engine also comes with lowered compression, ported cylinder head and high-performance valve springs for ultra-high boost pressures. The engine is a complete overhaul with blue printing and balancing. This engine is designed for an increase in torque of 100% over stock.
Steve Dinan’s engine shop has been building racing engines for 43 years. Those engines have won many championships including three prototype racing championships including 2 overall wins in the 24hrs of Daytona in 2011-2013. You will not find a higher quality engine. All engines are backed with a two-year warranty.