Here are the detailed OEM specifications for the 2018-2022 BMW M8 (F92/F93), M5 (F90) 4.4L V8 S63M Engine with Transmission, Guaranteed 28K Miles:

BMW M8 (F92/F93), M5 (F90) 4.4L V8 S63M Engine and Transmission (2018-2022)

Engine Specifications:

1. Engine Model:
   • S63B44T4 (commonly referred to as S63M)
   • The S63 engine is a twin-turbocharged 4.4-liter V8, designed for high-performance models like the BMW M5 (F90) and M8 (F92/F93).
2. Displacement:
   • 4.4 liters (4,395 cc)
3. Configuration:
   • V8 engine with a 90-degree V-angle, providing a compact design that lowers the vehicle’s center of gravity and improves handling dynamics.
4. Turbocharging:
   • Equipped with two twin-scroll turbochargers, located within the “hot-vee” (inside the engine’s V), which reduces turbo lag and improves throttle response.
   • Boost pressure for the M5 and M8 is generally around 1.5 bar (21.75 psi).
5. Horsepower:
   • 600 hp (447 kW) at 6,000 rpm in standard M5 and M8 models.
   • 617 hp (460 kW) at 6,000 rpm in M5 Competition and M8 Competition variants.
6. Torque:
   • 553 lb-ft (750 Nm) of torque available from 1,800 to 5,600 rpm, ensuring strong acceleration throughout the rev range.
7. Redline:
   • Maximum engine speed is 7,200 rpm.
8. Fuel System:
   • Direct Fuel Injection with High-Precision Injection technology to optimize fuel delivery for efficiency and power.
   • Equipped with dual high-pressure fuel pumps for consistent fuel supply at high performance.
9. Cooling System:
   • Advanced cooling system includes dual water-cooled intercoolers, additional radiators, and engine oil cooling to maintain optimal operating temperatures under high-stress conditions.
   • Electric water pump aids in cooling down the turbos after the engine is turned off, helping prevent turbo wear.
10. Valvetrain:

• DOHC (Dual Overhead Camshafts) with variable valve timing (BMW’s VANOS system).
• Valvetronic variable valve lift system optimizes air intake, improving throttle response and fuel efficiency.

11. Exhaust:

• Equipped with a sport-tuned exhaust system, featuring electronically controlled flaps for varied sound profiles, which can be adjusted via the M driving modes.

12. Engine Management:

• BMW’s Digital Motor Electronics (DME) system manages engine performance with precision, allowing customizable driving modes (Comfort, Sport, Sport+).

13. Compression Ratio:

• 10.0:1, providing a balance between power and efficiency.

14. Lubrication:

• Dry-sump lubrication system, ensuring consistent oil flow even under extreme cornering forces, making the engine suitable for track use.

Transmission Specifications:

1. Transmission Model:
   • 8-speed ZF 8HP automatic transmission with Steptronic manual shift capability via paddle shifters on the steering wheel.
2. All-Wheel Drive (xDrive):
   • BMW’s M xDrive system with rear-biased torque distribution, allowing for selectable drive modes (4WD, 4WD Sport, and 2WD) for greater driver control and flexibility.
   • The system can direct all power to the rear wheels in 2WD mode for a more traditional rear-wheel-drive experience.
3. Transmission Features:
   • Torque converter lock-up clutch for improved response.
   • Launch Control: Optimized for rapid acceleration from a standstill.
   • Drivetrain Control Modes: Customizable settings for throttle response, gear shift speed, and shift points, controllable via the M driving mode settings.
4. Gear Ratios:
   • Designed for a balance of performance and fuel efficiency with close ratios for the lower gears, ensuring quick acceleration, and taller gears for high-speed cruising.
5. Shifting Modes:
   • Fully Automatic Mode: For comfortable daily driving.
   • Manual Mode: Using the paddle shifters or gear lever to manually select gears.

Performance:

• 0-60 mph:
  • M5 (Standard): 3.2 seconds
  • M5 Competition: 3.1 seconds
  • M8 Coupe: 3.1 seconds
  • M8 Competition: 3.0 seconds
• Top Speed:
  • Electronically limited to 155 mph (250 km/h) in standard models.
  • Increased to 189 mph (305 km/h) with the M Driver’s Package.

Mileage:

• 28,000 miles: Guaranteed low mileage, ensuring relatively minimal wear and tear, making it ideal for use in either replacement or performance upgrades.

Additional Features:

1. Engine Weight:
   • Approximately 617 lbs (280 kg), making the engine relatively light for its output, enhancing overall vehicle dynamics.
2. Emissions and Fuel Efficiency:
   • Compliant with Euro 6 and U.S. EPA standards.
   • Combined fuel economy is approximately 20-22 mpg depending on the specific model and driving conditions.
3. Transmission Cooling:
   • Equipped with a transmission oil cooler, which maintains optimal temperature during high-stress driving situations.

Summary of Benefits:

• High Performance: The S63M engine is known for its balance of power and everyday usability, with explosive acceleration and smooth power delivery.
• Guaranteed 28K Miles: Low-mileage engine and transmission, ensuring longevity and reliability for future use.
• Track and Street Capabilities: The M8 and M5 equipped with this powertrain are capable on both the track and the street, with features like xDrive and adjustable driving modes.