Stage 3 S63 High Performance Engine (TU4) | BMW M5/M8
Vehicle Fitment & Product Details
- Type Engines & Engine Parts
- Make BMW
- Model(s) M5, M5 Competition, M8, and M8 Competition
- Vehicle Year(s) 2018, 2019, 2020, and 2021
- Chassis F90, F91, F92, and F93
- Body Style(s) Coupe, Sedan, Convertible, and Gran Coupe
- Part Number CB463-6003
- Fits Engines S63
Share on
The S63 engine is not designed to have large increase in boost. CarBahn has designed a high-performance engine to handle very high outputs by utilizing higher quality racing components. This engine includes higher quality racing Forged Carrillo connecting rods, CP forged pistons and CarBahn high-performance valve springs, ported heads and reground crankshaft with stronger bearings. This Engine includes a complete rebuild with a valve job, timing chains, chain guides, tensioners, water pump thermostat, new bearings, seals and gaskets.
The stock high compression ratio is high for CAFÉ. (Corporate average fuel economy). However, this increased compression limits engine performance with higher boost setting by decreasing the size of the fuel air charge in the combustion chamber and by forcing the ignition timing to retard far below MBT (mean best timing). The CarBahn engine has .5 less compression to optimize the engine for the increased boost. If this an emissions legal street car the lowered compression has the added benefit of reducing catalyst inlet temperatures and improved drivability on pump gas.
Includes, Forged Rods, Forged Pistons, high performance valve springs for more boost, Ported heads, Reground crankshaft with stronger bearings, Labor and machine work for complete overhaul.
Engine core acceptance parameters
Must be complete core (factory engine, from oil pan to valve cover)
- Block must have no:
- Holes or cracks in casting
- Holes or crack in covers
- Bore damage that cannot be honed out
- Thrust surface damage
- Journal surfaces damage
- Bolt hole damage that can’t be repaired
- Heads must have no:
- Holes or cracks in casting
- Holes or crack in covers
- Thrust surface damage
- Journal surfaces damage
- Bolt hole damage that can’t be repaired
- Additional repair charges could apply for damaged items that are not normally changed during an overhaul and cannot be repaired or serviced
- Valves
- Crankshafts
- Camshafts
- Guides
- ValveTronic mechanism
- Vanos mechanism