MATCHING GASOLINE QUALITY TO MOTOR TRUCK OPERATION 640447
Data from two recent surveys on (1) truck operating modes and (2) truck fleet maintenance and durability experience are presented and used to relate fuel properties to operating conditions.
Trucks in city operation run at part throttle most of the time, with most full-throttle operation in acceleration modes. Highway trucks, on the other hand, spend a large percentage of their time at high engine speeds in full-throttle, constant-speed operating modes interspersed with frequent accelerations and decelerations.
Data from fleet surveys are used to show that inadequate octane quality of gasolines contributes to preignition failures, especially when such gasolines are used in combination with some types of lubricating oils. The fleet surveys also indicate that engine life is continuing to improve.