The new 6.9LD V8 diesel engine has been designed by International Harvester Company to meet the needs of the truck market, Class 2 through 6 GVW, and to provide light to medium duty diesel power to the OEM market at low cost.
The complex requirements of these markets have been continously monitored during the evolution of the new engine and the design has been updated accordingly. Simplicity of design, superior performance, reliability and durability were the main optimization criteria. These have been accomplished by closely coordinating the design, development, and manufacturing of the new product.
This paper describes the concept of the new engine, the philosophy of design, the subsequent laboratory and field development testing, plus engine performance and durability data.