Engine speed limitation

Fig 1: Engine Speed Limitation Temperature Graph

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Engine Speed Limitation Graph

Courtesy of SAAB-SCANIA OF AMERICA, INC.

When the engine speed reaches 6000 RPM and the coolant temperature falls below 60°C, the engine torque is limited due to the fact that the maximum allowed air mass/combustion is limited. If the coolant temperature is above 80°C a further 100 RPM is allowed, i.e. the maximum allowed air mass/combustion in this case is limited at 6100 RPM.