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4JZ1 Traditional Internal Combustion Engine

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Product Introduction

Detailed Introduction to the Qingling Isuzu 4JZ1 Traditional Fuel Engine

The Qingling Isuzu 4JZ1 engine is the next-generation core model in Isuzu’s 4J series. As a high‑end, upgraded conventional diesel engine, it represents Isuzu’s advanced 3.0‑liter platform for medium- to long‑term business development. First installed in vehicles in Japan in 2016, the engine was introduced to China via technology transfer in 2018 and is now manufactured by Qingling Isuzu (Chongqing) Engine Co., Ltd. Building on the proven reliability of Isuzu engines, this model integrates cutting‑edge manufacturing processes and fuel‑saving technologies. With its powerful output, exceptional fuel efficiency, and state‑of‑the‑art feature set, it has become the core powertrain for Qingling’s mid‑to‑high‑end light trucks and pickup trucks, earning the title of “new-generation power benchmark” in the commercial vehicle sector. Widely used in various mid‑to‑high‑end commercial vehicles and construction machinery, it strikes a perfect balance between efficiency and reliability—and after years of rigorous testing in global markets—has emerged as a trusted, high‑end conventional diesel engine within the industry.

I. Core Basic Parameters

The 4JZ1 conventional gasoline engine uses diesel as its fuel and employs a traditional fuel supply system. Drawing on Isuzu’s decades of diesel engine R&D expertise, its core parameters have been meticulously tuned to strike a balance between power, environmental performance, and fuel efficiency, as follows:

Project	4JZ1-TCS (China V / Euro V)	4JZ1-TCH (China V / Euro V)	4JZ1-TCG62 (China VIb / Euro VI d)	General Notes on Foreign Trade
Brand / Model	Qingling Isuzu 4JZ1-TCS	Qingling Isuzu 4JZ1-TCH	Qingling Isuzu 4JZ1-TCG62	Inline four-cylinder, DOHC 16V, liquid-cooled, with turbocharging and intercooling.
Bore × Stroke	φ95.4×104.9mm	φ95.4×104.9mm	φ95.4×104.9mm	Displacement 2.999L (3.0L class) , upgraded on the same platform as the 4KH1
Compression ratio	19.0:1	19.0:1	19.0:1	Efficient combustion that balances power and fuel economy.
Rated power	110 kW (150 hp) at 2,800 rpm	129 kW (175 hp) at 2,860 rpm	133 kW (181 hp) at 2,860 rpm	Power coverage spans all mid‑to‑high‑end scenarios, with a 30%+ improvement over the 4KH1.
Maximum torque	375 N·m at 1280–2800 rpm	430 N·m at 1450–2800 rpm	430 N·m at 1450–2800 rpm	1280 rpm ultra-low-speed burst , No Strain When Starting or Climbing Hills
Fuel System	Denso 1800 bar high-pressure common rail + i-ART	Denso 1800 bar high-pressure common rail + i-ART	Denso 1800 bar high-pressure common rail + i-ART	Multiple injections increase combustion efficiency by 10% and reduce noise by 4 dB.
Intake / Valve Timing	VGT Turbo + Intercooler + Exhaust VVT	VGT Turbo + Intercooler + Exhaust VVT	VGT Turbo + Intercooler + Exhaust VVT	Fast low-speed response, ample high-speed power, and high efficiency across the entire speed range.
Emission standards	China V / Euro V (DOC + DPF + SCR)	China V / Euro V (DOC + DPF + SCR)	China VIb / Euro VI d (EGR + DOC + DPF + SCR + ASC)	Euro 5 does not require urea (in certain markets), while Euro 6 is fully compliant.
Minimum fuel consumption	≤185 g/kW·h	≤180 g/kW·h	≤178 g/kW·h	Fuel consumption per 100 kilometers 9–11L , 8%+ fuel efficiency compared to the 4KH1
Idle Speed / Maximum RPM	680±25 rpm / 4000±50 rpm	680±25 rpm / 4000±50 rpm	680±25 rpm / 4000±50 rpm	Idling is smoother, ideal for cold chain / idle conditions, and features lower noise levels.
External dimensions	805×740×625mm	805×740×625mm	805×740×625mm	Compact layout, compatible with KV800/M800 cabs, universal for left‑hand and right‑hand drive.
Dry weight	Approximately 310 kg	Approximately 315 kg	Approximately 320 kg	Lightweight design enhances the vehicle’s payload capacity, making it 5% lighter than vehicles in the same class.
Compatible Vehicle Models	KV800 Basic Edition, Van	High‑configuration KV800, refrigerated truck	KV800 Flagship Edition, High-End Special-Purpose Vehicle	Customizable flywheel housings, brackets, and PTOs for foreign trade, tailored to meet modification needs.

Engine Model The main models are the 4JZ1-TCS and 4JZ1-TCH (both turbocharged versions), with derivative models including the 4JZ1-TCG60 and others. All are manufactured by Isuzu Qingling’s original factory, inheriting Isuzu’s authentic technology. They can be paired with DENSO’s high‑pressure common rail injection system and equipped with i-ART automatic fuel injection precision compensation technology. The primary fuel delivery method is direct injection, making them well suited to meet the diverse needs of high‑end transportation and various operational scenarios.

Cylinder Structure Inline four-cylinder, water-cooled, four-stroke DOHC (Dual Overhead Camshaft) design with 4 valves per cylinder. The cylinder block is made of wear‑resistant alloy cast iron, while the cylinder head is crafted from aluminum alloy. The pistons are also made of aluminum alloy, balancing rigidity, high‑temperature resistance, and lightweight construction. The crankshaft is precision forged and undergoes rigorous strengthening treatment, ensuring high connecting rod strength. All components are sourced from renowned international brands, effectively extending service life.

Displacement Specifications Standard displacement: 2.999 L (approximately 3.0 L), with a bore × stroke of 95.4 mm × 104.9 mm. The compression ratio has been optimally tuned, resulting in a compact structure and ample power reserve, making it suitable for installation in a wide range of mid‑ to high‑end medium‑size commercial vehicles and construction machinery. Its technological level far surpasses that of the previous-generation 4JJ1 series engine.

Intake Method All are turbocharged models, equipped with an ultra‑small inertia VGS variable‑geometry turbocharger (which operates on the same principle as VGT variable‑section turbocharging technology). This effectively reduces turbo lag and enhances the engine’s power response. Paired with an intercooler assembly, it further optimizes power output efficiency, making it suitable for a variety of applications, including medium‑ and heavy‑duty loads and high‑efficiency transportation.

Emission levels The main model complies with China VIb emission standards and employs a liquid-cooled EGR + DOC + DPF + SCR + ASC aftertreatment system. Some versions can be adapted to meet the emission regulations of export markets, effectively reducing PM and NOx emissions through a DPD + urea SCR aftertreatment system. The Japanese domestic version even meets the region’s stringent exhaust emission and fuel efficiency standards, allowing it to benefit from environmental tax incentives and reductions.

II. Power Performance

As Isuzu’s new generation of conventional internal combustion engine models, the 4JZ1 engine builds on its proven strengths in stability and reliability while focusing on enhancing power output, torque range, and fuel efficiency. It is ideally suited for high‑efficiency transportation, heavy‑load applications, and construction machinery operations in mid‑ to high‑end commercial vehicles. Based on the actual vehicle configurations and parameters, its specific performance characteristics are as follows:

4JZ1-TCS model The rated power can reach 110 kW (150 hp) at a speed of around 3,400 rpm; the maximum torque is 375 N·m, with a torque‑speed range of 1,280–2,800 rpm. The wide torque output range ensures smooth and stable power delivery, while idle operation remains exceptionally steady. This engine is well suited for medium- to heavy‑load applications such as mid‑to‑high‑end urban delivery and intercity logistics, offering responsive power delivery.

4JZ1-TCH model The rated power can reach 129 kW (175 hp) at a speed of around 3,400 rpm; the maximum torque is 430 N·m, with a torque range spanning 1,450–2,860 rpm. The engine delivers outstanding performance, far surpassing that of mainstream engines in China with similar displacements. It offers ample power in the low‑rpm range, easily meeting the demands of heavy loads, uphill climbs, and high‑altitude operations, while experiencing minimal power degradation. In certain optimized versions, the maximum torque can even reach 500 N·m.

Fuel economy Fuel economy is one of its core highlights: the Japanese government’s real‑world average fuel consumption is approximately 8.2 km/L (equivalent to just over 12 liters per 100 kilometers). Actual fuel consumption is about 10% lower than the fuel consumption standards set by the Japanese government. Qiangling models equipped with this engine deliver outstanding fuel efficiency and exhibit strong fuel adaptability, compatible with both No. 0 diesel and low‑temperature diesel. The conventional fuel delivery system is mature and reliable, and when paired with the ECONO fuel‑saving mode and ECOstop automatic start‑stop technology, it further reduces operating costs.

Startup Performance It features an electric start system with a cold‑start capability down to -25°C, making it suitable for a wide range of climatic conditions. The engine delivers rapid start-up response, smooth idling operation, and exceptional noise control. After NVH optimization tailored to specific vehicle models, the cab boasts even better noise isolation. Vehicles equipped with this engine can reach a top speed of 140 km/h, meeting the demands of efficient transportation. Moreover, the ECOstop automatic start‑stop technology automatically shuts off the engine when the vehicle is parked and idling, reducing both noise and emissions.

III. Structural Features and Core Advantages

The reason why the 4JZ1 traditional internal combustion engine has become the main powertrain for mid‑to‑high‑end commercial vehicles lies in its ability to build upon Isuzu’s legacy of reliability while optimizing its structural design and upgrading its core technologies, thereby addressing the key pain points of mid‑to‑high‑end commercial vehicle users—namely, “high efficiency, fuel economy, reliability, and peace of mind.” Its specific advantages are as follows:

Extremely durable It employs a wear‑resistant alloy cast iron cylinder block paired with an aluminum alloy cylinder head and piston, balancing rigidity with lightweight design. The cylinder block utilizes thin‑wall bore quenching technology to enhance bore smoothness, durability, and strength. Components are sourced from renowned international brands, and the manufacturing processes are highly refined, delivering exceptional B10 life. Under typical operating conditions, the unit boasts long overhaul intervals and an extremely low failure rate, significantly reducing downtime and maintenance costs while being well suited for prolonged, high‑intensity operation.

Technologically advanced and practical. It is equipped with multiple Isuzu‑original technologies, including the ECONO fuel‑saving mode (for manual transmission models) and the ECOstop automatic start‑stop technology. The ECONO mode automatically adjusts fuel injection based on vehicle load and road grade, suppressing excessive acceleration to achieve optimal fuel efficiency. The ECOstop technology effectively reduces noise and emissions while enhancing fuel economy during stop-and‑go traffic and idling, all while featuring a VGS variable geometry turbocharger that optimizes power response.

Wide compatibility Compact in size and featuring standardized mounting interfaces, it is primarily used in mid‑to‑high‑end light trucks such as the Qingling KV800 and M800, as well as various mid‑to‑high‑end pickup models. It can also be adapted for small concrete mixers, mobile air compressors, and other construction machinery, making it suitable for a wide range of applications including mid‑to‑high‑end urban delivery, intercity logistics, high‑value‑added conversions, and field operations. In addition, it is compatible with right‑hand drive configurations to meet export requirements.

Balancing Power and Environmental Protection While delivering powerful performance, it strictly meets China VIb and higher emission standards. With mature aftertreatment technology and precise emission control, it not only complies with domestic environmental protection policies but also adapts to emission regulations in multiple regions worldwide, eliminating concerns about exceeding emission limits. The Japanese domestic version even qualifies for environmental tax reductions, balancing environmental responsibility with cost-effectiveness.

IV. Technology Inheritance and Application Scenarios

The 4JZ1 engine was developed by Isuzu of Japan and represents Isuzu’s latest generation masterpiece in the traditional internal combustion engine sector. It was first installed in the Isuzu ELF light truck in Japan in 2016. In October 2018, Qingling and Isuzu officially signed a technology transfer agreement for Isuzu’s new-generation 4JZ engine, bringing this model to China and adapting it for local optimization. Several derivative models were subsequently launched, tailored to both domestic market needs and export applications. Qingling has consistently upheld the authentic Isuzu technology, ensuring stable and reliable engine performance. Models such as the 4JZ1-TCG60 have already been incorporated into multiple mid‑to‑high‑end flagship models from Qingling.

As Isuzu’s latest generation of classic, traditional internal combustion engines, its application scenarios are focused on the mid‑to‑high end market. Based on the actual vehicles it is equipped in, its core application areas include:

Commercial Vehicle Segment: Qingling KV800, M800, and other mid‑to‑high‑end light trucks, as well as various mid‑to‑high‑end pickup models, are primarily designed for mid‑to‑high‑end urban delivery, intercity logistics, and high‑value cargo transportation. With ample power, fuel efficiency, and reliable performance, these vehicles can enhance transportation efficiency and perfectly meet the needs of premium logistics customers.

Construction Machinery Sector: High‑end construction machinery such as small concrete mixers and mobile air compressors feature dual-system drive for both locomotion and operation, adapting to complex construction environments with stable and efficient performance. They can meet the demanding requirements of field operations and engineering projects while leveraging advanced technologies to reduce operating costs.

Export and High-End Specialized Applications: Compatible with right-hand drive versions, meeting the needs of regions such as Southeast Asia, the Middle East, and Japan. It can also be used for high‑end special vehicle conversions, catering to high‑value transportation and specialized operational scenarios. Thanks to its advanced technology and reliable performance, it has earned recognition in global markets.

V. Summary

The Qingling Isuzu 4JZ1 conventional fuel engine is a new-generation, high‑end classic model built around the core principles of “high efficiency, fuel economy, reliability, and advanced technology.” It inherits the proven reliability of Isuzu’s 4‑series engines while integrating Isuzu’s latest diesel engine R&D technologies, delivering a comprehensive upgrade in power output, fuel efficiency, and technical specifications. By eschewing redundant feature bloat and focusing on addressing the core needs of mid‑ to high‑end commercial vehicle users—namely “efficient transportation, cost reduction, and environmental friendliness”—this engine has earned widespread acclaim. After years of refinement in global markets, backed by mature technology, cutting‑edge configurations, broad adaptability, and outstanding performance, it has not only become the preferred powertrain for domestic mid‑ to high‑end commercial vehicles and construction machinery, powering multiple flagship Qingling models and gaining market recognition—but can also be custom‑configured to meet export requirements, adapting to the diverse usage needs across regions worldwide. Continuing Isuzu’s legendary reputation for “fuel efficiency and reliability,” this engine is leading the evolution of conventional fuel engines toward greater efficiency and environmental sustainability.

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