4m40 Engine Breakdown: Power, Specs, and Performance Explained

The 4m40 engine is an impressive power unit from Mitsubishi, known for its durability and reliable performance. It has found its place in various Mitsubishi models, especially those intended for both urban and off-road use. Here’s a detailed look at the key aspects of the 4m40 engine’s specifications, power, and performance.

4m40 Engine
4m40 Engine

1. Power and Performance Overview

The 4m40 engine is a 2.8-liter, 4-cylinder, turbocharged diesel engine. It offers a balance of power and torque suitable for a range of vehicles, particularly those in the SUV and truck segments. This engine is designed for solid, dependable performance, whether tackling rough terrain or handling daily driving needs.

Power Output

  • Max Power: 125 kW (approximately 168 horsepower) at 3,800 rpm.
  • Torque: 343 Nm (approximately 253 lb-ft) at 2,000 rpm.

These specifications illustrate the 4m40’s capability to provide strong acceleration and consistent performance even under load. The torque figures make it suitable for towing and off-road challenges where higher pulling power is required.

2. Engine Specifications

Below is a comprehensive table summarizing the specifications of the 4m40 engine:

SpecificationDetails
Engine Type2.8-liter, 4-cylinder, diesel, turbocharged
Displacement2,827 cc (2.8 L)
Bore x Stroke94 mm x 100 mm
Compression Ratio17.5:1
Max Power125 kW (168 hp) @ 3,800 rpm
Max Torque343 Nm (253 lb-ft) @ 2,000 rpm
Fuel SystemDirect fuel injection
Cooling SystemWater-cooled
TurbochargerYes
IntercoolerYes
Valve ConfigurationDOHC (Double Overhead Camshaft)
Fuel TypeDiesel
AspirationTurbocharged
Engine LayoutInline 4-cylinder
Oil CapacityApproximately 8.5 liters

4m40 Engine
4m40 Engine

3. Performance Characteristics

Acceleration and Handling

The 4m40 engine provides strong low-end torque, which translates into impressive acceleration for a diesel engine of its class. This characteristic allows vehicles equipped with this engine to maintain stability and power during rapid acceleration and while climbing steep inclines. The engine’s design also minimizes turbo lag, enhancing throttle response.

Fuel Efficiency

While the 4m40 is not optimized for fuel economy in the same way that smaller engines are, its direct injection system helps improve fuel utilization. On average, fuel consumption for vehicles fitted with the 4m40 engine ranges between 10-12 liters per 100 km, depending on driving conditions and vehicle load.

Durability and Reliability

The 4m40 engine has a solid reputation for durability, often praised for its longevity even under heavy use. Its construction includes high-quality materials, which help it withstand rough conditions commonly faced in off-road scenarios. Regular maintenance, such as changing the oil and replacing air and fuel filters, will support the engine’s performance over the years.

4. Applications and Use Cases

The 4m40 engine has been used in various Mitsubishi vehicles, including the Mitsubishi Pajero and Mitsubishi L200. These models benefit from the engine’s powerful performance characteristics, making them popular among those who require a robust engine for both urban commuting and off-road driving.

Off-Road and Utility Use

The engine’s high torque output and rugged design make it ideal for vehicles used in off-road conditions, such as driving through rough trails, sand dunes, and muddy terrains. Its reliability ensures that it can handle tough environments while still maintaining performance.

Towing Capacity

With its 343 Nm of torque, the 4m40 engine is well-suited for towing medium-sized trailers, boats, or other loads. This makes it a preferred choice for those who require a vehicle that can handle extra weight without compromising on performance.

5. Conclusion

The Mitsubishi 4m40 engine stands out for its combination of power, durability, and versatility. It provides solid performance across a range of driving conditions, making it a reliable choice for both urban and off-road adventures. Its specifications demonstrate why it has been a favored option in Mitsubishi’s lineup for vehicles needing dependable, mid-sized diesel power.

6. FAQs

What Makes the 4M40 Engine Unique?

The 4M40 stands out for its robust cast-iron block, intercooled turbocharger, and exceptional reliability in diesel engine technology, particularly in Mitsubishi vehicles.

How Reliable is the 4M40 Engine?

With proper maintenance, the 4M40 demonstrates high durability, typically lasting 200,000-300,000 miles. Regular servicing is key to maintaining its performance and longevity.

What Vehicles Use the 4M40 Engine?

Primarily found in Mitsubishi Pajero, L200/Triton pickup trucks, and various commercial vehicles, this engine is renowned for its versatility in different automotive applications.

What Are Common Maintenance Issues?

Potential concerns include fuel injection pump wear, turbocharger sensitivity, and the need for precise maintenance. Regular oil changes and timing belt inspections are crucial.

How Does the 4M40 Compare to Modern Diesel Engines?

While an older design, the 4M40 remains competitive with its strong torque output (280-300 Nm), efficient fuel consumption, and proven reliability in challenging environments.

74 thoughts on “4m40 Engine Breakdown: Power, Specs, and Performance Explained”

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