Isuzu RZ4E 1,9L diesel engine

The Isuzu RZ4E 1.9L is >a modern, fuel-efficient, turbocharged diesel engine developed by Isuzu, designed to provide a balance of power and economical performance for light commercial vehicles like the Isuzu D-Max and MU-X. Key features include advanced combustion technology for better efficiency, a Variable Geometry Turbocharger (VGS), and an Exhaust Gas Recirculation (EGR) system for reduced emissions. It offers improved fuel economy and comparable, if not better, power than the larger 2.5L engine it replaced.

Key Specifications and Features

Engine Type: Turbocharged, direct-injection diesel engine.
Displacement: 1.9 liters.
Fuel Efficiency: Designed for high fuel efficiency, with features like a new clothoid curve combustion chamber and anti-friction coatings.
Emissions Control: Equipped with a new Variable Geometry Turbocharger (VGS) and an Exhaust Gas Recirculation (EGR) system to reduce harmful emissions.
Power Output: Produces significant power, with figures around 110 kW (150 horsepower) and 350 Nm of torque.
Combustion: Features a high-pressure common rail injector system to improve fuel atomization and achieve a more complete combustion.
Lightweight: The engine is significantly lighter than the 2.5L engine it replaces, contributing to improved vehicle efficiency.
Transmission: Paired with 6-speed manual and automatic transmissions.

Advantages and Purpose

Enhanced Fuel Economy:

The primary goal of the RZ4E was to improve fuel efficiency while maintaining performance.
Performance:

Provides strong torque from low RPMs, making it capable for both city driving and highway merging.
Modern Technology:

Incorporates advanced features for a cleaner and more efficient diesel engine.
Downsizing:

A successful example of engine downsizing, where a smaller engine achieves comparable or better performance and efficiency than a larger predecessor.

Applications

The RZ4E engine is used in Isuzu’s popular D-Max pickup trucks and MU-X SUVs in various markets.

The Isuzu RZ4E engine is a 1.9-liter, 1898cc in-line 4-cylinder VGS turbo intercooler diesel engine with DOHC 16 valves. It features a Direct Injection Electronic Commonrail fuel system, a variable geometry turbocharger (VGS), and is designed for improved fuel economy and durability with components like a long-life timing chain and hydraulic valve adjusters. The engine produces approximately 110 kW (150 PS) of power at 3,600 rpm and 350 Nm of torque from 1,800 to 2,600 rpm.

Key Specifications:

Engine Type: RZ4E-TC, In-Line 4-Cylinder, VGS Turbo Intercooler, DOHC 16V, Diesel
Displacement: 1,898 cc
Bore x Stroke: 80 mm x 94.4 mm
Compression Ratio: 16.5:1
Maximum Output: 110 kW (150 PS) @ 3,600 rpm
Maximum Torque: 350 Nm @ 1,800 – 2,600 rpm
Fuel System: Direct Injection Electronic Commonrail

Key Features:

Variable Geometry Turbocharger (VGS): Provides strong mid-range torque delivery.
Durability Features:
- High-stiffness cylinder block.
- Long-life steel timing chain with automatic tensioner.
- Automatic hydraulic valve lash adjusters.
- Cartridge-type ecological oil filter.
Fuel Efficiency: Designed for good fuel economy, with claims of around 7.4 L/100km in combined driving.
Clean Emissions: Compliant with emission standards, such as Euro 6.

This engine is used in models like the Isuzu D-Max and mu-X, offering a blend of performance and efficiency for various applications, including commercial use and family SUVs.

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