Isuzu raises the bar with new F Series clean diesel engines

Isuzu F Series 4HK1 Engine
Isuzu F Series 4HK1 Engine ARKAJON

Isuzu Australia Limited (IAL) has stepped things up with its popular F Series medium-duty trucks, now offering a new range of innovative driveline options.

The company now lays claim to offering the cleanest medium-duty Japanese diesel engine on the Australian market today, with its 4HK1 engine package.

The new 4HK1 is a 5.2 litre four-cylinder diesel engine generating an impressive 154Kw and 762Nm of torque, with an even more powerful variant posting 177Kw and a hefty 765Nm of torque.

The low-displacement 4HK1 achieves these power levels while remaining incredibly clean thanks to a two-stage turbocharger incorporating both low and high pressure turbochargers, creating a wide torque band and plenty of low-down grunt.

The engine is mated to a torque converter equipped automated manual transmission (TC-AMT), making good use of the torque band.

Common rail injection pressure is increased by more than ten per cent to 200 MPa, the injectors themselves have an increased number of nozzles, the piston shape is changed, the Exhaust Gas Recirculation (EGR) system is more accurately controlled, the intercooler size is increased by ten per cent and the intake cam profile is revised.

An external injector for Isuzu's diesel particulate diffuser or DPD system has been added to the new 4HK1 exhaust and emissions system, eliminating oil dilution through the regeneration process.

Isuzu F Series models fitted with the new 4HK1 engine also benefit from the inclusion of Isuzu's Idle-Stop System (ISS), which works to produce impressive fuel economy figures by cutting engine use when the vehicle comes to a stop - for example, at traffic lights.


F Series Chassis and Driveline
F Series Chassis and Driveline

The F Series is also offered with a new six-cylinder 6HK1 engine with maintenance-free Diesel Oxidation Catalyst (DOC) for an ultra-reliable, low maintenance solution.

The 7.8 litre water-cooled, six-cylinder direct injection diesel engine generates 191kW and 761Nm of torque across a wide rev range, offering more than enough torque when required.

The 6HK1 electronic control common rail injection system features ten per cent higher injection pressure and a new injector design, improving combustion efficiency. This equates to higher engine performance, lower emissions and lower fuel consumption.

The 6HK1 DOC is available in various Isuzu FRR, FSR, FSD, FTR and FTS models equipped with Isuzu's own air-assisted six-speed manual transmission.

A two-pedal option is also available, with the Allison 2500 Series automatic transmission - featuring a torque converter with a lock-up clutch - exclusive to the Isuzu F Series models with 6HK1 DOC engine.

IAL Chief Engineer, Product Strategy, Simon Humphries, said the engine technology underpinning the range represents a more cohesive and adaptable approach.

"With the new 2016 F Series range, we've developed the driveline technology to cater to an ever-changing market.

"We've listened closely to the requirements of our customers and taken note of the global trend toward lower displacement engines throughout the automotive world," Mr Humphries said.

Topics:  diesel isuzu truck driver trucking turbo

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