Caterpillar Performance Handbook, January 2017, SEBD0351-47

Appendix A ● Reference Equations (English Units)

On-Highway Trucks

Reference Equations (English Units)

MPH = 60 × RPM M × Ra × Rt

*Miles per Hour

60 × RPM Ra × Rt × MPH

M =

*Tire Revolutions per Mile

Ra = 60 × RPM

*Rear Axle Ratio

M × Rt × MPH

Rt = 60 × RPM

*Transmission Gear Ratio (Top Gear)

M × Ra × MPH

RPM = MPH × M × Ra × Rt 60

*Revolutions per Minute (Engine)

Torque = HP × 5252 RPM

Torque in lbf-ft

Horsepower = Torque × RPM 5252

Horsepower in lbf-ft per Second

*No Drop Box or Auxiliary Transmission.

12-24 Edition 47