Home page

4KB1 Traditional Internal Combustion Engine

Category: Accessories

Product Inquiry Contact Us

Product Introduction

Detailed Introduction to the Qingling Isuzu 4KB1 Traditional Fuel Engine

The Qingling Isuzu 4KB1 engine is a new-generation conventional diesel engine developed by Isuzu through an upgrade based on the classic 4JB1 model. It is primarily targeted at the blue‑plate commercial vehicle market, perfectly suited to the logistics and transportation needs of the new era. With its core advantages of lightweight design, high torque, and low fuel consumption, it has become the exclusive powertrain for Qingling’s flagship light trucks such as the New 100P and KV100. While inheriting Isuzu’s renowned reliability, it further aligns with high-frequency operating conditions like urban delivery and short‑haul logistics, establishing itself as a “high‑efficiency power benchmark” in the light truck segment.

I. Core Basic Parameters

The 4KB1 conventional internal combustion engine uses diesel as its fuel and employs a traditional fuel delivery system. Its core parameters have been optimized and tuned to balance power output with fuel efficiency, while also meeting the requirements of the new blue‑plate regulations. The specific parameters are shown in the table below, with detailed explanations as follows:

Project	4KB1-TCG60 (China VIb / Euro VI)	General Notes on Foreign Trade
Brand / Model	Qingling Isuzu 4KB1-TCG60	Inline four-cylinder, liquid-cooled, turbocharged, high‑pressure common rail
Bore × Stroke	φ92×94mm	Displacement 2.499L (2.5L class) , Blue-plate compliant, golden displacement
Compression ratio	17.8:1	Efficient combustion that balances power and fuel economy.
Rated power	96 kW (131 hp) at 3000 rpm	Mainstream power for light blue‑plate trucks—versatile for urban delivery and short‑haul operations.
Maximum torque	360 N·m at 1300–2600 rpm	1000 rpm output 250 N·m , Strong start / Climbing ability
Fuel System	Denso 1800 bar high-pressure common rail	Multi-stage injection boosts combustion efficiency by 10%.
Intake Method	Turbocharging + Intercooler	Fast low-speed response and smooth power output.
Emission standards	China VIb / Euro VI (DOC + DPF + SCR)	Global mainstream emissions, compatible with over 100 countries.
Minimum fuel consumption	≤188 g/kW·h	Fuel consumption per 100 kilometers 9–11L , 10% lower than the same level
Idle Speed / Maximum RPM	700±25 rpm / 4000±50 rpm	Stable idling, ideal for prolonged idle operation.
External dimensions	760×710×590mm	Compact layout, compatible with KV100/100P cab.
Dry weight	Approximately 280 kg	Lightweight design to enhance the vehicle’s payload capacity.
Compatible Vehicle Models	KV100, New 100P, Blue-Plate Light Truck, Box Truck	Left‑hand / right‑hand drive universal, with global after-sales coverage.

Engine Model The main model is the 4KB1 turbocharged version, with a dedicated variant tailored to comply with the new blue‑plate regulations. All models are manufactured by Isuzu Qingling at the original factory, inheriting Isuzu’s authentic technology and representing a new generation of engines upgraded from the classic 4JB1 engine—specifically designed to suit light trucks and other blue‑plate commercial vehicles.

Cylinder Structure Inline four-cylinder, water-cooled, four-stroke overhead valve design; the cylinder block is made of cast iron for superior rigidity and high‑temperature resistance. The crankshaft undergoes precision forging to balance rigidity with lightweight construction, while the connecting rods boast high strength, effectively extending service life and making them well suited for light trucks that frequently start and stop.

Displacement Specifications Standard displacement of 2.5L, precisely tailored to meet the new Blue License Plate regulations, featuring a compact structure and standardized installation interfaces, it can be easily adapted to various Qingling light-duty truck models without requiring major adjustments to the vehicle’s body layout, balancing both power and lightweight design requirements.

Intake Method The entire series features a turbocharged design that optimizes low‑rpm torque output. Compared to the previous 4JB1 engine, it delivers a more responsive power response, meeting the power demands of high‑frequency operations such as urban delivery and short‑haul logistics, while adapting to a wide range of load scenarios.

Emission levels The entire lineup meets China VI emission standards and is equipped with a DPF aftertreatment system that supports manual DPF regeneration. It can proactively select regeneration timing based on driving conditions, enhancing operational efficiency and adapting to various application scenarios while complying with domestic environmental protection policies.

2. Power Performance

As an upgraded model of the 4JB1, the 4KB1 engine focuses on optimizing low-speed torque and fuel efficiency, perfectly aligning with the high‑efficiency, fuel‑saving, and flexible operational requirements of light trucks registered under the blue license plate. It is ideally suited for high‑frequency applications such as urban delivery and short‑distance express freight transportation, with the following specific performance parameters:

Turbocharged version (4KB1) The rated power ranges from 96–97 kW (131–132 hp) at 3,400 rpm; maximum torque reaches 360 N·m, with a torque‑speed range spanning 1,300–2,600 rpm. Its low‑rpm performance is particularly impressive—delivering 250 N·m of torque at just 1,000 rpm—providing instant responsiveness and delivering outstanding performance within its class, easily handling tasks such as full‑load acceleration and hill climbing.

Fuel economy Leveraging the mature technology of traditional fuel supply systems and paired with a lightweight airframe, this engine delivers outstanding fuel efficiency. Light-duty trucks equipped with this engine can significantly reduce fuel costs for urban delivery and short‑haul transportation. With its strong fuel compatibility, it is compatible with both #0 diesel and low‑temperature diesel, making long‑term operation even more cost‑effective.

Drive Adaptation It is perfectly matched with the Isuzu MSB 5-speed manual transmission, delivering optimal fuel efficiency and ample power while maximizing stability and durability. Tailored to the frequent start‑stop and short‑distance round‑trip driving characteristics of light trucks, it offers smooth operation and a low failure rate.

Startup Performance It is designed to work with a 24V dual-battery system, making winter starts easier for users in northern regions and providing greater confidence when operating electrical devices after the engine is turned off. Featuring an electric start system, it delivers outstanding cold-start performance, responds swiftly upon ignition, runs smoothly at idle, keeps noise levels within a reasonable range, and is perfectly suited for long-distance driving.

III. Structural Features and Core Advantages

Building on Isuzu’s legacy of reliability, the 4KB1 conventional gasoline engine has been specially optimized for light-duty trucks with blue license plates. Its core advantages address the key pain points of commercial vehicle users—“efficiency, cost savings, and peace of mind”—as follows:

Strong low-end torque, ideal for high-frequency operating conditions. Optimized turbocharger tuning delivers outstanding low‑rpm torque output—powerful torque is available as early as 1,000 rpm—allowing the vehicle to meet full‑load acceleration and hill‑climbing demands without relying on high engine speeds. This makes it an ideal match for urban delivery scenarios characterized by frequent starts and stops, as well as short‑distance logistics requiring efficient transshipment, thereby boosting transportation efficiency.

Easy to maintain and low in cost. The structural design is simple and inherits the durable DNA of the 4JB1 engine series. Its components are highly interchangeable, easy to procure and maintain, and the daily maintenance procedures are straightforward. The equipped DPF system supports manual regeneration, allowing for flexible adaptation to various operating scenarios, reducing downtime due to repairs, and lowering maintenance costs.

Precise Compatibility Compact in size and featuring standardized mounting interfaces, it is specially designed to fit Qingling’s new 100P, KV100, and other blue‑plate light truck models. It is also compatible with various specialized light trucks (such as fire trucks and aerial work platforms), and comes equipped with a factory‑installed power take‑off switch for convenient aftermarket modifications, making it suitable for a wide range of operational scenarios.

Technologically mature and reliable. Built upon Isuzu’s mature 4JB1 technology platform, it has undergone rigorous market testing, boasts a well‑established technical system with no significant design flaws, requires only modest fuel quality, and is capable of handling complex road conditions in urban, suburban, and rural areas. It delivers outstanding stability, features an extremely low failure rate, and ensures efficient operations.

IV. Technology Inheritance and Application Scenarios

The 4KB1 engine was developed by Isuzu of Japan as a next‑generation conventional fuel engine, upgraded based on the classic 4JB1 engine. As Isuzu’s closest partner in China, Qingling has localized and optimized the engine after introducing it to the Chinese market, with a primary focus on meeting the requirements of the new Blue License regulations. Several derivative models have been launched, all while steadfastly adhering to authentic Isuzu technology to ensure stable and reliable engine performance. The engine is widely used in many of Qingling’s flagship light‑truck models.

As the core powertrain for blue‑plate light trucks, its application scenarios are centered on urban delivery, short‑haul logistics, and related fields. Based on the actual vehicle models it is equipped on, its primary adaptation scenarios include:

Commercial Vehicle Sector: Qingling’s new 100P, KV100, and other blue‑plate light trucks are designed for urban delivery, short‑haul express freight, and intra‑urban/rural logistics applications. They deliver ample power and exceptional maneuverability, easily handling various road conditions while boosting transportation efficiency[2].

Specialized Vehicle Sector: Specialized equipment such as light-duty fire trucks and aerial platform trucks are equipped with factory‑installed power take‑off (PTO) switches for convenient aftermarket modifications, making them suitable for a wide range of specialized operational scenarios and leading the development of the specialized vehicle superstructure industry.

Short‑haul transportation scenarios: supermarket deliveries, intra‑factory shuttle services, and short‑distance bulk material transfers. With strong low‑end torque and excellent fuel efficiency, it can effectively control operating costs and is well suited to frequent start‑stop operations and short‑distance round trips.

V. Summary

The Qingling Isuzu 4KB1 conventional fuel engine is an upgraded powertrain specifically designed for light-duty trucks, with “efficiency, reliability, and cost-effectiveness” at its core. Inheriting the durable DNA of Isuzu’s 4JB1 series, this engine has been specially optimized for high‑frequency operating conditions such as new blue‑plate regulations, urban delivery, and short‑haul logistics, delivering comprehensive improvements in low‑rpm torque, fuel economy, and compatibility. By eschewing redundant technology and focusing solely on addressing the core needs of blue‑plate light‑truck users—namely “efficient transportation, reduced costs, and stable, reliable performance”—this engine leverages mature technology, precise adaptability, and low maintenance costs to become the heart of Qingling’s flagship models like the New 100P and KV100. It is perfectly tailored to meet the demands of China’s blue‑plate commercial vehicle market, helping users achieve efficient, cost‑effective operations while carrying forward Isuzu’s legendary reputation for engine performance.

Keywords: 4KB1 Traditional Internal Combustion Engine

Previous: 6HK1 Traditional Fuel Engine

Next: 4JZ1 Traditional Internal Combustion Engine