As far as job titles go, 'Chief Engineer at Isuzu Motors Limited's PT Product Planning & Engineering Dept. 2' is hardly succinct, but Iwao Sasaki isn't one for cutting corners. While his remit is simple—build the world's best commonrail diesel engines—his job is immensely technical. Thankfully, Sasaki-san is happy to translate the complex day-to-day process of developing a new engine into layman's terms. Here, live from Japan, he explains Isuzu's engine methodology, the challenges of unreliable fuel in less-regulated countries and exactly why chipping your engine might not be the best idea.
When creating the ECU software for a new common-rail diesel (CRD) 4WD, how does Isuzu determine the perfect balance between power and reliability?
Isuzu engines are engineered to produce an understated power and torque output to create a de-stressed environment, therefore reducing engine wear and promoting component longevity. The reliability is determined by creating the optimum fuel/air mixture and ensuring that the heat generated by the combustion process is constant and also dissipated uniformly.
Isuzu engine design efforts are aimed at generating maximum torque at low engine speeds—under 2000 rpm—because at those speeds fuel consumption is at its most economical and the engine's response characteristics are perceived as positive; ie, it has good 'pulling power'.
On average, what's involved in the development of a new engine?
Diesel engine development is a constant evolution, so it's impossible to put a single time frame on any particular engine. That said, the latest generation of the 4JJ1 diesel engine that powers the D-MAX and MU-X was rigorously tested over approximately four million kilometres! Isuzu is working tirelessly to further improve its diesel engines to produce higher output and durability, while maintaining class-leading thermal efficiency among 3-litre diesel engines. At the same time, the company is pouring its energies into clean diesel engine R&D with the aim of reducing emissions of particulate matter (PM) and nitrogen oxides (NOx).
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