cat vs mack horsepower

[mackr1989]

say for example a mack has a 400 motor which is 400 hp to the wheels. what does a cat put out to the wheels with say a 550 at the flywheel?

[j hancock]

Mack engine HP and torque are rated at the flywheel same as CAT and Cummins.

 

[TeamsterGrrrl]

That's true of the current Volvo engines rebranded as Mack. However, the genuine Mack engines were often underated- for example, the top rating for a 2001-2006 Maxidyne was 370 HP, but that was at 2100 RPM. At 1700 RPM that engine actually put out 405 HP! There were also cases where Mack "hopped up" the engines, but never increased the advertised rating- The "300 Maxidyne" was given 4 valves per cyclinder and a displacement bump from 11 to 12 liters, but it's advertised rating was never changed from 300 HP. I drove a number of both the Maxidyne and Econodyne "300" 12 liter engines, and they felt like at least 350 HP if not more.