Isuzu's new engine, found in the D-MAX pickup and the MU X SUV, is a fascinating piece of engineering. Although relatively small for its category, its performance allows it to not only keep up with but even surpass the rest of the pack.
How did Isuzu accomplish this automotive technical marvel, and why is this RZ4E the undisputed champion among diesel engines?
Providing purchasers with more customization options is a smart move for automakers, as it allows them to better meet the varying demands and preferences of their customers. That's why IPC imports the MU X 1.9 RZ4E to sell at local dealerships. Its release coincided with the imminent retirement of IPC's 2.5 models that do not meet Euro 4 standards.
Those looking to purchase a mu-X must now decide between the more powerful 3.0 and the smaller, more fuel-efficient 1.9. If you're interested in the latter, you should know that IPC allowed us to test drive both the manual and automatic LS-A models before they were released to the public. The following are our musings.
Remarkably Refined in Every Way
When many of us needed to get something done, we had to rely on bulky, immobile desktop computers. Modern smartphones are more capable than ever before because to advancements in technology as well as design, and they still fit easily in the palm of your hand. The RZ4E continues in the same vein of radical newness.
Isuzu began investing in research and development for greener, more efficient, and smaller engines in the early 21st century. They accomplished this by developing a 1.9-liter engine that outperformed a 2.5-liter 4JK1 unit.
The RZ4E engine is the result of Isuzu's decades-long dedication to and mastery of diesel engine design and production.
Engineers at Isuzu made use of the company's own analytic technologies to modify the combustion chamber in a way that maximises engine performance while minimising fuel usage and exhaust pollutants.
Piston wear is greatly reduced when starting a cold RZ4E engine because of the "graphite coated" pistons. Human-made anti-friction material Diamond-Like Carbon (DLC) is coated on the piston pins (gudgeon pins) for use in extreme conditions.
The RZ4E is among the most advanced turbo diesels on the market since it has all these technologies and more, including a 6-speed gearbox that helps improve fuel efficiency and reduce CO2 emissions.
Lighter Is Better
A distinguishing feature of the RZ4E is its lightness.
The RZ4E weighs only 39 kg less than the bigger Isuzu 4JK1 engine, despite the many features and cutting-edge technologies.
Put that in context, shall we? You're probably familiar with the 5-gallon water jugs that we have on hand. They weigh around 20 kilogrammes each, as anyone who has lifted one will attest to. Isuzu was capable of shedding the mass of three full 5-gallon water jugs.
In general, the lighter your vehicle is, the more efficient it will be.
Calmer and Less Noisy
In the past, diesels had a reputation for being significantly noisier than their gasoline-powered equivalents. In addition, they were well-known for their vibrations, which were not the pleasant sort, as the song would have you believe. But the RZ4E from Isuzu is changing minds.
Isuzu is a leader in diesel engines, so they drew on their years of experience when designing the RZ4E. They also incorporated cutting-edge tech from their R&D labs. Despite being a lighter and smaller engine, Isuzu was successful in making the RZ4E run more smoothly and softer than bigger engines such as the 4JK1 by incorporating advancements in diesel design and development.
The cylinder block's structural damping is improved because to the combination of a resin cylinder camshaft covering and highly-stiff cast iron cylinders. Cast iron is used in the production of the RZ4E cylinder block's "Long Skirt" design. Because of these two qualities, the resulting cylinder block is light, rigid, and stiffer. Customers gain from lessening of the product's overall harshness, vibration, and noise levels. A lightweight cylinder block allows for more cargo space and better acceleration.
It’s Sturdier and Lasts Longer
The RZ4E's extended engine life, improved performance, and reduced total cost of ownership are three of its hallmark features.
Each part is reinforced to make it stronger and last longer. To create a standard connecting rod, the end caps are forged and machined individually. RZ4Es, on the other hand, are built using Fracture Split rods and a unique design. This connecting rod is a solid piece of metal that has been forged together. The next step involves "snapping" the cap off the rod with specialised tools. Because of this procedure, the fracture surface of the rod and cap components is not uniform. When compared to connecting rods made using the traditional method, the imperfect surface of this one enables for a more secure and long-lasting cap-to-rod connection. Improved placement accuracy between both the cap and the rod makes the Fracture-Split method more reliable and reduces power loss in the engine. This is because the internal diameter of the bigger end is more accurately measured.
The VGT is able to finely and efficiently regulate the turbocharger based on the volume of air being taken in. As exhaust stream from the engine is minimal at low rpm, turbocharger performance suffers. The VGS compensates for this. To ensure the longevity of the turbocharger, the turbine is constructed from a high-temperature durable material. The water-cooling of the turbocharger's main body contributes to its dependability, longevity, and low total cost of ownership.
Ability to Be Serviced Easily
With the help of the Hydraulic Valve-Lash Adjuster, the valve lash clearance is always precisely right. In addition to enhancing performance, this decreases service expenses. Components like the alternator & air conditioning compressor no longer need their own separate drive belts because they may be powered by a single-engine accessory drive belt. The auto-tensioner prevents the drive belt from being too loose or too tight, keeping the belt in proper working order and extending the life of the components it powers.
Oil filters of the cartridge variety are more eco-friendly. When the engine oil oil filter needs to be changed, the RZ4E oil-filter seems to be a paper-cartridge type rather than metal canisters with a fixed paper component "spin-on" type. The paper element of the RZ4E oil-filter is the sole component that has to be changed.
The RZ4E meets the more stringent Euro-4 emissions criteria thanks to the inclusion of Blue Power technology.
Make Do With Fewer Resources While Achieving the Same Results
The effectiveness and efficiency of RZ4E is its most distinguishing feature. It would be reasonable to assume that such a compact engine wouldn't be able to generate the necessary power and torque for the D-MAX or mu-X, but advanced engineering on the part of Isuzu proves this assumption wrong.
The smaller 1.9-liter RZ4E generates 150 PS and 350 Nm of torque, which is greater than the 2.5-liter 4JK1-TC's 136 PS and 320 Nm of torque.
The RZ4E's low gas mileage is probably its best feature. The RZ4E improves upon the already impressive fuel economy of some D-MAX and mu-X models, where the 4JK1-TC was formerly the most efficient engine.
The new mu-X models equipped with the RZ4E proven to be an efficient running machine. With its 6-speed manual transmission, the Isuzu MU X RZ4E six-speed outperformed the 2.5L 4JK1 manual by 14.3 kilometres per litre on the highway. The Isuzu MU X RZ4E LS-A six-speed automatic variation improved fuel efficiency by 48% compared to the preceding 2.5-liter 4JK1 5-speed automatic form, reaching 35.8 kilometres per litre.
The innovative 1.9-liter RZ4E turbo diesel engine is a game-changer in the industry. Thanks to technological advancements at Isuzu, it is capable of performing like engines much larger than its own. They improved the fluidity, quietness, and lightness of the process. And to top it all off, they improved its eco-friendliness and fuel efficiency to match. The RZ4E from Isuzu is designed to be a pound-for-pound champion, and it does so with ease.
Superior Engine Innovation
The Isuzu RZ4E engine, which took four years to build, seems to have a displacement metric of 1.898 litres and can generate peak energy of 150 PS on 3,600 rpm and a torque of 350 N-m between 1,800-2600 rpm while adhering to EURO 4 standards.
DLC (Diamond-Like Coating) piston pins, a clothoid-curve combustion chamber, a new fracture split design connecting rod, and DLC injector needles are just some of the cutting-edge technologies that work together to reduce engine friction and, in turn, improve fuel economy and cut down on emissions.
The RZ4E's innovative liquid-cooled Variable Geometry Turbocharger technology complements the combustion system to provide responsive acceleration from idle speeds. The turbine in a turbocharger is constructed from heat-resistant material, and the turbocharger's central body is cooled by water to ensure long service life.
The new RZ4E engine has several eco-friendly features, including a cartridge-type oil filter that only requires the paper element to be replaced, an HVLA (Hydraulic Valve Lash Adjuster) that maintains the proper valve lash clearance, and a Sole Engine Accessory Drivebelt for both the alternator and AC compressor.
The Isuzu mu-X RZ4E is powered by a new 1.9-liter 4-cylinder in-line Blue-Power turbo diesel engine, which is capable of 150 PS of performance and 350 Nm of torque. These numbers are paired with a Sequential 6-speed automatic transmission.
Both the front and rear suspension systems use coil springs and stabiliser bars, with the front using an independent double wishbone and the rear using a five-link setup. This model's brakes are four-wheel vented discs, so stopping the car is a breeze.
Let’s Move On to the Mu-X’s External Specifications
The mu-X immediately stands out thanks to its sleek and threatening appearance. The mu-front X's fascia is given a rugged appearance thanks to the sharp Bi-LED Headlamps featuring Auto-Leveling Function and Daytime Running Lights (DRL) housed within the grille. In contrast, two LED positioning lamps placed horizontally at the back of the vehicle stand out. The mu-overall X's appearance is polished off with these 18-inch Aluminum-Alloy Wheels.
Everything about it, inside and out, is ultra-contemporary. Observant readers will notice that Isuzu has changed a few minor points. Along with the updated interior's colors and textures, the car's new Blue Ambient Lights on the side panels help make the ride more relaxing. The mu-X seats seven people in comfort due to its spacious cabin. This particular model has first-row Bucket Seats featuring back compartments and a movable headrest. Second-row seating is provided by a 60/40 folding bench with an armrest and three-position headrests. A 50/50 folding bench with two-way adjustable headrests is provided for the third row of seating.
The mu-infotainment X's system is the vehicle's central nervous system. The mu-X is featured with such an 8-inch touch panel that can play CDs, DVDs, Aux-in inputs, USB drives, MP3 players, and Bluetooth audio and video devices. Six speakers add to the pleasantness of the sound. The rear passengers can use a 10-inch monitor mounted on the roof, complete with a remote.
Superb Efficiency in Fuel Use
Recent fuel efficiency tests by the company confirmed the new RZ4E's superior performance thanks to its updated design and plenty of engine upgrades.
IPC ran the Isuzu MU X RZ4E LS-A variations it was testing alongside the Isuzu mu-X 2.5 Litre variants it was already testing and found to be fuel-efficient.
The combined 37.27 km/l for the Isuzu MU X RZ4E LSA MT is an increase of up to 14.32% compared to the combined 32.60 km/l for the 2.5-liter variant, while the combined 35.80 km/l for the Isuzu MU X RZ4E LSA AT is an increase of up to 48.36% compared to the combined 24.13 km/l for the 2.5-liter variant.
The test is overseen and verified by the Automobile Association of the Philippines (AAP), and it is carried out in accordance with the limits and requirements set forth by the DOE.
They have a fuel-efficient 2.5-liter engine to begin with, but the addition of the newer Isuzu RZ4E engine has made their Isuzu MU X model even more intelligent by allowing it to operate at a greater capacity while consuming less fuel.
Smart and Practical New Variants
The Isuzu RZ4E Blue-Power engine will be offered for the mu-X and D-MAX, and it will eventually replace the current 2.5-liter variations.
The Isuzu MU X RZ4E LS 42 MT, which will be offered by IPC, is a basic SUV with all the characteristics necessary for use in a fleet and as a company car. This model was created to provide you with ease and luxury without emptying your bank account.
The Isuzu MU X RZ4E 42 MT and AT models, which are loaded with top-tier SUV characteristics, will be the ideal vehicles for city slickers who need to transport seven people in luxury and efficiency. These vehicles, which have been dubbed a "smart and functional variation," give you the appearance of a luxury SUV but are affordable to operate.
The D-MAX RZ4E 42 LS MT and also AT will be high-tech and practical models of the vehicle, just like the mu-X. These two new variations are perfect for city drivers, as they improve the truck's comfort levels without sacrificing its utility as a cargo van.
The mu-X includes specific features designed to ensure the user's safety and security. It has all the standard safety features like an anti-lock-braking system featuring electronic brake-force dispersion, an anti-theft alarm system, a rearview camera and mirror, and a reverse detecting system.
Further, the mu-X is equipped with amenities meant to improve the travel experience for both the driver and the passengers.
In addition, IPC made some changes to the new variants' under-the-hood components to make maintenance easier for the buyer, such as installing an HVLA (Hydraulic Valve Lash Adjuster) to maintain the right valve-lash clearance, a Single-Engine-Accessory Drive-belt for the AC as well as alternator compressor, as well as a Cartridge type Oil Filter to make oil filter replacement less of a hassle.
If you're confused by the plethora of SUVs on the market, the MU X 1.9 might not just be the best option when searching for mu-X specifically.
That 2019 Isuzu mu-X, with its potent engine and other features, guarantees a fun ride.
Isuzu has spent decades perfecting the diesel engine, and their efforts have paid off in the form of the RZ4E engine. A 2.5-liter 4JK1 engine couldn't keep up with the 1.9-liter one. The piston pins are treated with a layer of Diamond-Like Carbon (DLC), a man-made anti-friction substance. Isuzu's RZ4E is helping to change people's perceptions about diesel vehicles. The reduction of the product's harshness, vibration, and noise also benefits the consumer.
Fracture Split rods are used in the construction of RZ4Es, which are then fabricated into a one-of-a-kind frame. Each component has been fortified to increase its strength and durability. Water-cooling the turbocharger's main body contributes to its dependability, lifespan, and low total cost of ownership. While the 2.5-liter 4JK1-TC produces 136 PS and 320 Nm of torque, the 1.9-liter RZ4E from Isuzu produces 150 PS and 350 Nm. It took four years to develop the engine, but at 3,600 rpm, it can produce 150 horsepower and 350 Newton-meters of torque.
A new 1.9-liter 4-cylinder in-line Blue-Power turbo diesel engine provides power for the Isuzu mu-X RZ4E, allowing it to produce 150 PS and 350 Nm of torque. The brakes on this vehicle are all-wheel ventilated discs, making it easy to come to a stop. The current 2.5-liter versions of the mu-X and D-MAX will be phased out and replaced by the Isuzu RZ4E Blue-Power engine. The DOE regulates the test, and the Automobile Association of the Philippines (AAP) makes sure it's conducted within those parameters. Both the manual and automatic versions of the Isuzu MU X RZ4E 42 are packed to the gills with cutting-edge SUV features. The mu-X, branded a "smart and useful version," features comforts designed to ease the burden of travel on both the driver and the passengers.
- Isuzu's new engine, found in the D-MAX pickup and the MU X SUV, is a fascinating piece of engineering.
- They accomplished this by developing a 1.9-liter engine that outperformed a 2.5-liter 4JK1 unit.
- The RZ4E weighs only 39 kg less than the bigger Isuzu 4JK1 engine, despite the many features and cutting-edge technologies.
- The smaller 1.9-liter RZ4E generates 150 PS and 350 Nm of torque, which is greater than the 2.5-liter 4JK1-TC's 136 PS and 320 Nm of torque.
- The innovative 1.9-liter RZ4E turbo diesel engine is a game-changer in the industry.
- The Isuzu mu-X RZ4E is powered by a new 1.9-liter 4-cylinder in-line Blue-Power turbo diesel engine, which is capable of 150 PS of performance and 350 Nm of torque.
- IPC ran the Isuzu MU X RZ4E LS-A variations it was testing alongside the Isuzu mu-X 2.5 Litre variants it was already testing and found to be fuel-efficient.
- The combined 37.27 km/l for the Isuzu MU X RZ4E LSA MT is an increase of up to 14.32% compared to the combined 32.60 km/l for the 2.5-liter variant, while the combined 35.80 km/l for the Isuzu MU X RZ4E LSA AT is an increase of up to 48.36% compared to the combined 24.13 km/l for the 2.5-liter variant.
- The Isuzu RZ4E Blue-Power engine will be offered for the mu-X and D-MAX, and it will eventually replace the current 2.5-liter variations.
- The Isuzu MU X RZ4E LS 42 MT, which will be offered by IPC, is a basic SUV with all the characteristics necessary for use in a fleet and as a company car.
- The Isuzu MU X RZ4E 42 MT and AT models, which are loaded with top-tier SUV characteristics, will be the ideal vehicles for city slickers who need to transport seven people in luxury and efficiency.
- The D-MAX RZ4E 42 LS MT and also AT will be high-tech and practical models of the vehicle, just like the mu-X. These two new variations are perfect for city drivers, as they improve the truck's comfort levels without sacrificing its utility as a cargo van.
- The mu-X includes specific features designed to ensure the user's safety and security.
FAQs About Isuzu Engines
DMAX is an American manufacturer of diesel engines for trucks, based in of Dayton, Ohio. DMAX, originally announced in 1997, is a 60-40 joint venture between and operated by General Motors and Isuzu.
Every 2022 Isuzu F-Series model is equipped with the most powerful version of the Cummins B6. 7 Efficiency Series, This legendary 6.7-liter, inline six-cylinder diesel engine produces 260 horsepower and 660 lb. -ft.
Also powering Isuzu's N Series trucks, the Euro 4 emissions-compliant version in the MU-X produces 130kW at 3600rpm and 380Nm at 1800-2800rpm and comes with a B10 rating of 500,000km, which means 90 per cent of engines are expected to reach 500,000km before requiring a rebuild.
Isuzu regards sound quality as a key selling point and differentiator. Diesel engines make a characteristic noise known as diesel clatter, diesel nailing, or diesel knock. This is caused largely by the sudden combustion of fuel that has already evaporated when combustion starts.
Although Isuzu has partnered with many different manufacturers over the years—including GM, Toyota, and Subaru at various times—the company is best described as an independent business venture, rather than a subsidiary of another company.