Thomas Built Buses is now accepting orders for Detroit DD5 and DD8 engines.
“We’ve been waiting for this day for a long time,” says Caley Edgerly, Thomas Built Buses president and CEO. “Both of these engines were developed from the ground up specifically for the medium-duty industry. These clean-sheet designed engines aren’t new. They are only new to the school bus industry. This proprietary engine platform was launched in Europe in 2013. Today, more than 90,000 engines are running on this platform with great success, including best-in-class fuel economy and maintenance intervals, proven power, performance and reliability, lower emissions and a lower cost of ownership.”
The Detroit DD8 engine is a 7.7L inline 6-cylinder medium-duty engine with specific development for the Thomas Built Buses Saf-T-Liner HDX. It boasts a horsepower range of 260-300HP and a torque range of 660-860 lb.-ft. The DD5 engine is a 5.1L inline 4-cylinder engine adapted specifically for the Thomas Built Buses Saf-T-Liner C2. It offers a 200-240HP range and a torque range of 560-660 lb.-ft.
Both the DD5 and DD8 offer power and fuel economy thanks to a design that enables usable power and torque to be reached at lower engine speeds. School districts can expect at least a 3 percent improvement in fuel economy compared with other diesel engines in the category.
Longer service intervals also are a key differentiator, with some of the longest service intervals in their class with oil and filter change intervals up to 45,000-miles (or either 18 months or 1,500 hours, whichever comes sooner.) The Detroit engines feature top-load oil and fuel filters for easier serviceability, according to an announcement.
Both engines come with, Detroit Connect Virtual Technician remote diagnostic service. Virtual Technician will help transportation directors make informed maintenance decisions, so buses are serviced only when needed. Virtual Technician, with the backing of the experts at the Detroit Customer Support Center, provides access to in-depth diagnostic information to get buses repaired as quickly and accurately as possible, improving uptime.
Both the DD5 and DD8 were built to produce fewer emissions, so they meet 2017 greenhouse gas (GHG17) standards and will continue to meet emissions standards through 2020. Both engines also employ innovative technology such as a variable cam exhaust phasing, which allows additional heat to the exhaust stream. This enables efficient operation of the school bus’s aftertreatment system in low-speed, stop-and-go operations, virtually eliminating the aftertreatment issues of previous diesel engines, according to the company.