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Prime Mover Magazine


Isuzu comes clean on greenest engine yet

Two years after introducing the 4HK1 diesel engine in its medium-duty F Series, Isuzu claims it still has the cleanest truck engine of all the Japanese makes in the Australian medium-duty market.

Not only meeting but exceeding emission control requirements for commercial vehicles laid out by the current Australian Design Rules (ADR) 80/03, the 4HK1 engine complies with the ultra-stringent Euro VI and Japan’s Post New Long-Term (PNLT) emissions standards.

Isuzu engineers have managed this by creating a cooler combustion process which mitigates nitrogen oxide (NOx) emissions. Meanwhile, PM (particulate matter) is eliminated using Isuzu’s diesel particulate diffuser (DPD) system which features an external injector that introduces a precisely metered flow of fuel into the exhaust stream to periodically burn off the soot in the DPD.

At 5.2 litres the 4HK1 engine also boasts impressive fuel economy, as well as an incorporated Idle-Stop System that shuts off the engine when the vehicle comes to a stop, for example at traffic lights.

Being environmentally conscious doesn’t mean you can’t still pack a serious punch. The 4HK1 engine is a relatively low-displacement, high-torque, four-cylinder, two-stage turbocharged and intercooled diesel engine, matched with a torque converter-equipped automated manual transmission (TC-AMT). The torque converter significantly increases start-ability and driveability, replicating the take-off characteristics of a full-automatic.

The two-stage turbocharger in the 4HK1 comprises a combination of low and high-pressure turbochargers, which markedly increases torque levels at low engine speeds. In fact, the two-stage turbo technology is said to provide a whopping 45 per cent more torque at 1,000rpm than previous powerplants in these models.

Additionally, during times of high torque need such as when taking off from the lights, the torque converter multiplies torque by redirecting the fluid flow so it strikes the vanes on the stator at a more forceful angle.

The engine is available in two power ratings: 210hp and 240hp with respective torque ratings of 726Nm and 765Nm.
The 210hp variants include the Isuzu FRR, FRD and FSS 4x4 with a gross vehicle mass (GVM) range spanning 10.7 to 11 tonnes.

The 240hp engine is fitted in the FRR at 11 tonnes GVM, and the FSR which is available in two GVMs of 12 and 14 tonnes.

Isuzu says these engines represent more choice for medium-duty truck customers, powering models with features carefully tailored for a wide range of users and applications.

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