The Perkins 800 Series is a line of naturally aspirated and turbocharged 4-cylinder engines offering a capacity of 3.3 liters. The 800D range offers a 4-percent increase in power and a torque rise of 5 percent over its predecessor the 800C Series. Noise refinements of more than 2 dB(A) have been made through quieter combustion. A redesigned gear train and stiffer timing case reduces noise and vibration. An increase in top tank temperature (110 to 112 C) is designed to minimize impact on heat rejection and provide customers with ease of installation.