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Products & ServiceMarine engines

Weichai 8M21 series marine diesel engine (735-1000kW)



Parameters Table

Type Four-stroke, water cooled, V type, dual stage turbocharged and intercooled Number of cylinders 8
Bore & stroke 127×165 (mm) Displacement  16.72 L
Oil consumption rate ≤0.5 g/kW.h Noise  ≤100 dB(A)
Minimum fuel consumption rate 200 g/kW.h Idle speed 700±50 r/min
 (facing the flywheel)
Counter-clockwise Net weight 1900 kg
Dimensions (L×W×H) 1300×1200×1285 (mm)

Model Portfolio Table

Series Model Aspiration Rated power
Fuel system Emission Power rating
8M21* 8M21Y1000-23E200  Dual TA 735/1000 2300 HPCR IMO Ⅱ P3
8M21Y1100-23E200 Dual TA 809/1100 2300 HPCR IMO Ⅱ / EPA III P3
8M21Y1250-23E200 Dual TA 919/1250 2300 HPCR IMO Ⅱ / EPA III P4
8M21Y1360-23E200 Dual TA 1000/1360 2300 HPCR IMO Ⅱ / EPA III P5

Remark: The delivery date of products marked with * shall be subject to the reply of the manufacturer. Product parameters and model portfolio are for reference only. Please contact relevant personnel for official information on delivery time and fishing boat model portfolio. 

Product description

Safe and reliable

  • The high-strength design of structural parts such as engine block, piston and bearing bush ensures the reliability of diesel engine under high explosion pressure
  • Using the global excellent supplier system of Weichai, the quality of parts is reliable
  • Both cooling and lubrication systems have emergency interfaces
  • Perfect self-diagnosis system, perfect failure protection mode, and safe control strategy
  • Replace the filter without stopping

Strong power

  • Accurate control by electronic control units, high injection pressure, small fluctuation of rotating speed, and strong power
  • High torque range is wide, quick response, and fast speed increase
  • Constant power in high speed range

Economical and fuel-efficient

  • The fuel injection law is optimized, the fuel injection pressure, fuel injection quantity and fuel injection time are accurately controlled, the fuel is fully atomized, and the minimum fuel consumption rate is 200g/kW•h
  • Customized design for lower fuel consumption

Comfortable and environmentally friendly

  • It can realize multiple injections such as pre-injection and post-injection, and the noise and vibration are reduced by 20% compared with the mechanical pump system
  • Emission complies to IMO Tier II and EPA III

Strong practicability

  • LCD Internet instruments, vibration isolators, and hand-pressed oil well pumps can be equipped to meet the requirements of different customers
  • Modular design, compact structure, convenient engine room layout
  • Convenient maintenance, beautiful compact appearance
  • Different control strategies are adjusted according to different performance requirements
  • Receive/output various control signals, which meet the requirements of automation control
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R & D

20000 +
Global R & D personnel
R & D institutions in five countries, ten regions


  • 5,000,000 units
  • 22-10000Ps
  • 200 million kilowatts
  • Application for all markets