by Steve Johnson
Bus. Bus in parking area / parking lot / parking image by L. Shat from Fotolia.com
Caterpillar Inc. manufactures heavy machinery and construction equipment, including trucks, trailers, and large excavation vehicles. Caterpillar also manufactures and sells kit engines for industrial and street legal use. Labeled “on-highway” diesel engines, these engines come in several variants suitable for heavy-duty vehicles, including trucks, buses, and fire and emergency vehicles.
C7 torque specifications
The C-7 is a turbocharged inline-6 engine that is capable of producing 520 to 925 pound-feet of torque at 1,440 rpm. Its bore and stroke is 4.33 inches by 5.0 inches and it has a displacement of 7.2 liters. Its gross output ranges from 210 to 300 horsepower when equipped on trucks and buses, while its output ranges from 300 to 360 horsepower when equipped on RVs and fire trucks. The C7 has a compression ratio of 16.5: 1.
C9 torque specifications
The C9 is a four-stroke inline six-cylinder turbocharged diesel engine capable of producing torque ranging from 890 to 1,350 pound-feet at 1,400 rpm. Its bore and stroke is 4.53 inches by 5.87 inches and its displacement is 9.3 liters. Depending on the equipped vehicle, the C9 is capable of generating 285 to 425 horsepower at 2,200 or 2,300 rpm. Its compression ratio is 18: 1.
C11 torque specifications
The C11 engine is capable of producing a maximum torque of 1,050 to 1,450 ft-lbs at 1,200 rpm. Its bore and stroke is 5.12 inches by 5.51 inches and its displacement is 11.1 liters. It is equipped with a standard turbocharger and has a compression ratio of 17: 1. Its gross power is rated at 305 to 370 horsepower at 2,100 rpm.
C13 torque specifications
The C13 engine has a maximum torque output that ranges from 1,150 to 1,750 ft-lbs at 1,200 rpm. Its gross power ranges from 305 to 470 horsepower at 2,100 rpm. Its bore and stroke is 5.12 inches by 6.18 inches and its compression ratio is 17.1: 1. It has a displacement of 12.5 liters and also comes standard with the Series Turbocharger combustion system.
Torque Specifications C15
The maximum torque of the C15 engine ranges from 1,550 to 2,050 foot-pounds at 1,200 rpm and its gross power ranges from 435 to 625 horsepower at 2,100 rpm. Its bore and stroke is 5.4 inches by 6.75 inches and its compression ratio is 18: 1. It is also equipped with the Supercharger Series and its displacement is 15.2 liters.