Sinotruk Howo 371 Vs 420: Which Engine Performs Better?

Dec 13, 2024 | trucks

Engine Specifications of sinotruk howo

The Sinotruk Howo 371 and Howo 420 engines have different specifications to meet various performance needs. Here’s a comparison of their key details:

Sinotruk Howo 371 Engine

  • Engine Model: WD615.47 EURO-II
  • Number of Cylinders: 6, in-line
  • Fuel Type: Diesel
  • Air Inlet Type: Turbo-charging and intercooling
  • Displacement: 9.726L
  • Bore x Stroke: 126mm x 130mm
  • Compression Ratio: 17:1
  • Maximum Output: 272kW (371hp) at 2200rpm
  • Maximum Torque: 1500N.m at 1100-1600rpm
  • Minimum Fuel Consumption: ≤193g/kW.h
  • Engine Type: Water cooling, four stroke, direct injection
  • Weight: 850kg
  • Oil Capacity: 23 litres
  • Oil Pressure: 420-550 (rate) / 120-250 (idle point)

Sinotruk Howo 420 Engine

  • Engine Model: D12.42-20 EURO-II
  • Number of Cylinders: 6, in-line
  • Fuel Type: Diesel
  • Air Inlet Type: Turbo-charging and intercooling
  • Displacement: 11.596L
  • Bore x Stroke: 126mm x 155mm
  • Compression Ratio: Around 17:1
  • Maximum Output: 309kW (420PS) at 2000rpm
  • Maximum Torque: 1820Nm at 1100-1400rpm
  • Engine Type: Water cooling, four stroke, direct injection
  • Weight: Approximately 850kg
  • Oil Capacity: Around 23 litres
  • Oil Pressure: 420-550 (rate) / 120-250 (idle point)

Key Differences

  • Displacement: The 420 engine has a larger displacement (11.596L) than the 371 engine (9.726L), providing more power and torque.
  • Bore x Stroke: The 420 engine has a longer stroke (155mm) compared to the 371’s 130mm, affecting torque and performance.
  • Maximum Output and Torque: The Howo 420 engine offers higher output (309kW vs 272kW) and torque (1820Nm vs 1500Nm), making it more suitable for heavy-duty tasks.
  • Rotating Speed at Rated Power: The Howo 420 engine achieves its maximum output at a lower RPM (2000rpm vs 2200rpm), providing more efficiency at lower speeds.

These specifications show that the Howo 371 engine is good for medium to heavy-duty jobs, while the Howo 420 engine is better for tasks requiring higher power and torque.

Transmission and Gearbox of sinotruk howo

The sinotruk howo 371 and 420 both feature the HW19710 transmission system, which includes 10 forward gears and 2 reverse gears. This gearbox ensures efficient power transfer for heavy-duty operations, providing smooth shifts during long-haul transportation and while handling large loads.

Gearbox Configuration and Performance

Both Howo models come with the same standard 10-speed HW19710 gearbox, built for durability and high performance. The gear ratio is 5.73, helping the vehicles maintain power and efficiency on various terrains.

  • Howo 371: Some configurations of the 371 model come with a 12-speed gearbox, offering smoother operation and greater reliability. This is especially useful for drivers who need more flexibility in gear selection for different load conditions.
  • Howo 420: The standard gearbox in the 420 model is also the HW19710 with a 10-speed setup. While it doesn’t have the 12-speed option like the 371, the 10-speed gearbox still delivers strong performance for heavy-duty tasks.
  • Both transmissions are built to handle heavy loads and long-distance travel, making both models ideal for demanding logistics. The gearbox choice in each model reflects SINOTRUK’s focus on performance, reliability, and efficiency.

Clutch System of sinotruk howo

The clutch system in the Sinotruk Howo 371 and 420 engines is designed to handle the high torque and performance demands. Both models use a dual-plate diaphragm spring clutch, known for its reliability and ability to manage high engine torque.

Key Features of the Clutch System

  • Clutch Type: Both the Howo 371 and 420 engines use a dual-plate diaphragm spring clutch. This type of clutch is ideal for high torque applications and ensures smooth operation and long-lasting performance, even under tough conditions.
  • Clutch Diameter: Both engines feature a clutch diameter of around 430 mm, which provides a larger friction area for better durability and engagement performance.
  • Clutch Pressure Plate: The diaphragm spring pressure plate ensures smooth engagement and disengagement, reducing the effort needed from the driver and improving the clutch’s lifespan.
  • Torque Handling:
    • The Howo 371 engine (WD615.47) delivers a maximum torque of 1450 Nm at 1300-1600 rpm.
    • The Howo 420 engine (WD615.57) delivers a higher maximum torque of 1650 Nm at 1100-1600 rpm.
      The clutch system in the Howo 420 is built to handle this higher torque and deliver reliable performance.
  • Engagement Mechanism: Both models use a hydraulic or pneumatic system for clutch engagement, which provides smooth and precise control. This system includes a master cylinder, a slave cylinder, and a clutch release bearing to ensure smooth engagement and disengagement.

Maintenance and Cooling

  • Maintenance: The clutch systems in both engines are low-maintenance. Regular checks should include inspecting the clutch fluid, checking the condition of the clutch release bearing, and ensuring proper alignment of the components. The dual-plate diaphragm spring clutch requires less frequent replacement than other types.
  • Clutch Cooling: Some models come with additional cooling features, such as air-cooled or water-cooled systems. These prevent overheating, especially during heavy-duty operations, ensuring that the clutch maintains optimal performance even in tough conditions.

Overall, the clutch systems in the Sinotruk Howo 371 and 420 engines are built for reliability and efficiency, meeting the high torque demands of heavy-duty trucking applications.

Axle and Brake System of sinotruk howo

When comparing the axle and brake systems of the Sinotruk Howo 371 and 420 models, there are some similarities, as well as a few specific details to consider.

Axle System

  • Howo 371:
    • Front Axle: Typically HF7 or VGD95, offering reliable performance for both highway and off-road conditions.
    • Rear Axle: The rear axle is either HC16 or ST16 with a load capacity of 16 tons. It has a speed ratio of 3.93-5.73 and often uses a hypoid reduction type, ensuring durability and stability under heavy loads.
  • Howo 420:
    • Front Axle: Similar to the 371 model, featuring HF7 or VGD95, designed to handle tough driving conditions.
    • Rear Axle: Also HC16 or ST16, with a load capacity of 16 tons and a similar speed ratio range. While the rear axles are nearly identical to the 371 model, some variations may exist based on the truck’s configuration and application.

Brake System

  • Howo 371:
    • Service Brake: The 371 uses a dual-circuit compressed air brake for effective braking.
    • Parking Brake: Features a spring energy parking brake system that operates on the rear wheels using compressed air.
    • Auxiliary Brake: Equipped with an engine exhaust brake for added safety and control, especially on downhill grades.
    • Brake Type: It uses drum or drum/disc brakes with an air brake system for improved reliability.
  • Howo 420:
    • Service Brake: Like the 371, it uses a dual-circuit compressed air brake for optimal braking performance.
    • Parking Brake: Uses the same spring energy parking brake with compressed air on the rear wheels.
    • Auxiliary Brake: Comes with an engine exhaust brake, just like the 371, for additional control.
    • Brake Type: The 420 also uses drum or drum/disc brakes with air brakes, ensuring reliable and safe braking.

Key Comparisons

  • Both the axle configurations and brake systems are quite similar, emphasizing reliability and safety for both the Howo 371 and 420 models.
  • The brake design in both models is robust, built to handle heavy loads and tough terrains. Both trucks feature dual-circuit air brakes, spring energy parking brakes, and engine exhaust brakes.
  • The axle systems are nearly identical, with only minor differences based on the truck’s configuration and application. The load capacity and speed ratios remain consistent across both models, providing dependable performance under demanding conditions.

Fuel Consumption of sinotruk howo

When comparing the fuel consumption of the Sinotruk Howo 371 and Sinotruk Howo 420, there are key differences to consider. These differences help determine which engine offers better efficiency for your needs.

Sinotruk Howo 371 Fuel Consumption

  • Fuel Consumption Per 100KM (L):
    • 50% empty & 50% full load: 23.8 L[1][4]
    • 100% empty: 13.9 L[1][4]
    • 100% full load: 34 L[1][4]

The Howo 371, with its 371 HP (273 kW) engine, shows better fuel efficiency, especially in mixed load conditions. Its fuel consumption under full load is 34 L per 100KM, lower than the Howo 420.

Sinotruk Howo 420 Fuel Consumption

  • Fuel Consumption Per 100KM (L):
    • 50% empty & 50% full load: 25.4 L[1]
    • 100% empty: 14.7 L[1]
    • 100% full load: 36 L[1]

The Howo 420, with its 420 HP engine, consumes more fuel under similar conditions, especially when fully loaded. Its fuel consumption reaches 36 L per 100KM under full load, which is slightly higher than the Howo 371.

Key Comparisons

  • Mixed Load (50% empty & 50% full load):
    • Howo 371: 23.8 L[1][4]
    • Howo 420: 25.4 L[1]
  • Empty (100% empty):
    • Howo 371: 13.9 L[1][4]
    • Howo 420: 14.7 L[1]
  • Full Load (100% full load):
    • Howo 371: 34 L[1][4]
    • Howo 420: 36 L[1]

From these numbers, the Howo 371 performs better in fuel efficiency, especially under mixed load conditions. However, actual fuel consumption depends on various factors like terrain, driving conditions, and use cases.

General Performance and Use

When comparing the Sinotruk Howo 371 and Sinotruk Howo 420, there are key factors that affect their performance and suitability for different tasks.

Engine Power and Torque

  • Howo 371:
    • Maximum Output: 371 PS (273 kW) at 2000 rpm.
    • Maximum Torque: 1500 N.m at 1100-1600 rpm.
    • Displacement: 9.726 L.
    • Fuel Type: Diesel.
  • Howo 420:
    • Maximum Output: 420 HP (309 kW) at 2000 rpm.
    • Maximum Torque: 1560 N.m at 1200-1500 rpm.
    • Displacement: 9.726 L.
    • Fuel Type: Diesel.

The Howo 420 offers more horsepower and slightly higher torque than the Howo 371, making it a more powerful option. Both models have the same engine size and configuration, which ensures reliable performance for heavy-duty tasks.

Fuel Efficiency and Consumption

  • Howo 371:
    • Fuel Consumption: 23.8 L per 100 km (50% empty & 50% full load), 13.9 L (100% empty), 34 L (100% full load).
  • Howo 420:
    • Fuel Consumption: 25.4 L per 100 km (50% empty & 50% full load), 14.7 L (100% empty), 36 L (100% full load).

The Howo 420 uses slightly more fuel than the Howo 371, but both trucks perform well in terms of fuel efficiency given their engine size and load capacity. The difference is minimal and depends on driving conditions and load.

Transmission and Gear Ratios

  • Howo 371:
    • Transmission: 12 forward and 2 reverse gears (model HW19712).
    • Driving Axle Ratio: 4.77.
  • Howo 420:
    • Transmission: 10 forward and 2 reverse gears (model HW19710).
    • Driving Axle Ratio: 4.11.

The Howo 371 has a more complex transmission system with more forward gears and a higher axle ratio, which can improve handling under various conditions. The Howo 420, with its lower axle ratio, offers better fuel efficiency but may not perform as well under heavy-duty conditions.

Cargo Capacity and Performance

  • Both Models:
    • Cargo Weight (Full Load): 40 tons.

Both the Howo 371 and Howo 420 have the same maximum cargo weight of 40 tons. The Howo 371 is known for stable, reliable performance, making it a good choice for those seeking a balance of economy and comfort. The Howo 420 is favored for its power and stability, with lower maintenance costs, especially in regions like Africa.

Emission Standards and Engine Features

  • Both Models:
    • Available in various emission standards, including China II/Euro II and China V.
    • Engine Type: Inline, water cooling, turbo-charging & intercooling.
    • Minimum Fuel Consumption Rate at Full Load: ≤193 g/kW.h for both models.

Both trucks have excellent fuel consumption rates under full load, ensuring they meet various emission standards. Their advanced engine features, including turbocharging and intercooling, improve engine performance and fuel efficiency.

Additional Features

The Sinotruk Howo 371 and Howo 420 include features that boost performance, safety, and driver comfort. These make both models well-suited for heavy-duty tasks.

Cabin and Comfort Features

  • Howo 371:
    The Howo 371 has an HW76 cabin with one bed and air conditioning (A/C) to ensure driver comfort. Its four-point floating air suspension reduces shocks and absorbs bumps, providing a smoother ride.
  • Howo 420:
    The Howo 420 is equipped with the A7-V cabin, which includes double bunks and A/C. This spacious design is ideal for long-haul drivers who need comfortable resting options.

Fuel Tank Capacity

Both models have a 400L fuel tank, allowing them to travel long distances without frequent refueling, which is critical for heavy-duty and long-haul operations.

Tire Options

  • Howo 371:
    The Howo 371 offers 295/80R22.5 or 12R22.5 tubeless tires with 10+1 spare tires. These options ensure durability and adaptability to various terrains and loads.
  • Howo 420:
    The Howo 420 features 12.00R20 tires, with a total of 13 tires. These robust specifications make it suitable for demanding environments like mining and construction.

These features enhance the Sinotruk Howo 371 and Howo 420, making them reliable and versatile options for a wide range of transportation needs.

In conclusion, both the Sinotruk Howo 371 and 420 engines offer excellent performance for heavy-duty tasks. While the Howo 420 excels in power and torque, the Howo 371 stands out for its fuel efficiency and reliability. Ultimately, choosing between the two depends on specific needs—whether prioritizing performance or operational cost-efficiency. Both models are built to endure the toughest conditions, making them valuable assets in the trucking industry.https://www.tiktok.com/@enginetrade/video/7443798129108880671