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GVW 20 ton class cargo trucks were mainly powerd by L6 turbocharged engines ISUZU 6SD1TC and ISUZU 6RB1TC, and this time new 6WA1TC turbocharged engine with intercooler as a successor to 6RB1TC went into production in July 1992. In the recent cargo vehicle market in Japan, demand is increasing for higher out-put power, light weight, long service life, high reliability and low fuel consumption. Under such circumstances special engineering attention was paid to exhaust emissions and noise regulations which are expected to become even stricter in future. The basic engine structure consists of an OHC 4-valve type cylinder head and a ladder frame type cylinder block which satisfies the requirements for the high out-put power, low fuel consumption and light weight. Also, adopted are various variable structures such as a high pressure fuel injection pump with a variable injection timing and rate control device, variable swirl system and variable geometry turbocharger.

Isuzu Motors Limited introduced in the Japanese market a new micro-computer controlled turbocharged 6RA1TC diesel engine which powers new Isuzu heavy-duty trucks in 1983. This engine has successfully achieved both fuel economy and vehicle performance. This was realized by the combination of the newly developed micro-computer controlled fuel injection system and turbocharged air-to-air intercooled four valve low friction diesel engine. The purpose of the computer control system is flexible and precise control of fuel flow rate and fuel injection timing. This provides maximum engine performance and driveability, best fuel economy combined with the gearing of the vehicle, and easy operation for drivers. Additionally, this engine offers the following features: Good cold startability. Constant speed Cruise Control. Automatic schedule idling speed during warm-up. Stable low speed idling. Light and quick throttle response. Monitoring display for best fuel economy operation.