The Development of a Direct Injection Diesel Combustion System for Low Noise,Emissions and Mechanical Loading

In recent years the whole climate of diesel engine development has changed with the advent of noise and emissions legislation combined with the demand for higher specific output.

The conventional direct injection combustion chambers that have been used in the 1 litre/cylinder class of engine now present difficulties to the engineer in meeting these increasingly stringent demands.

The development history of a novel combustion system, ‘Quadram’, is presented, leading up to its introduction into quantity production. Emphasis has been placed on achieving the legislative targets while retaining cost effective fuel injection equipment, in an intensely competitive market complicated by worldwide fuel quality variations.

The ‘Quadram’ system is shown to display the key feature of achieving optimum performance with retarded injection timing, without any compromise to engine durability.