The Cat CT660 Class 8 truck has a third engine option, the Cat CT15 diesel, that delivers 550 horsepower and 1,850 lb.-ft. of torque. It joins the CT11 and CT13 engines.
The dual sequential turbochargers and precisely controlled high-pressure common-rail fuel system enable the CT15 to reach peak torque at 2,100 rpm, the company says. The strong pulling power at low engine speeds allows for shifting at lower speeds when accelerating and reduces the need for shifting when powering up steep grades. Interstage cooling between turbochargers increases air density to maintain power as speeds increase.
The CT15 also offers an engine brake rated at more than 600 bhp, which helps drivers maintain optimum speeds down steep or long grades without frequent use of the service brakes.
Like the CT11 and CT13, the Cat CT15 Engine features advanced emissions control technology that helps keep truck weight down and simplifies maintenance. The EGR system reduces NOx in-cylinder without requiring diesel emission fluid. The design eliminates the emission fluid costs and associated maintenance time, and it effectively increases the payload capacity of the truck.