Thomas Built Buses, along with Detroit, will be accepting orders for the most efficient, powerful, reliable and clean diesel school bus engines in the market starting in July. The Detroit™ DD5™ and DD8™, which were engineered from the ground up specifically for the medium-duty industry, are expected to revolutionize the school bus industry as they fill districts throughout the country. Here’s how they will benefit you.
Best-in-class Fuel Economy
With both the DD5 and DD8, you can expect power and best-in-class fuel economy. As contradictory as it may seem, the DD5’s and DD8’s state-of-the-art design allows for usable power and torque to be reached at lower engine speeds, providing fuel economy that you have to experience to believe. School districts can expect at least a three percent improvement in fuel economy compared to other diesel engines in the category.
Power, Performance and Reliability
The Detroit DD8 engine is a 7.7L in-line 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 660-860lb.-ft.
Conversely, 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 horsepower range and a torque range of 560-660 lb.-ft.
Through a simple fixed-geometry single-stage turbo on the DD8 and a dual-stage turbo on the DD5, both engines offer proven performance efficiency and reliability, plus an integrated engine brake option provides superior braking horsepower to extend service brake life. While new to the US market, both engines have been gaining popularity in Europe for the past five years for their power, performance and efficiency.
Ease of Maintenance
Both engines feature some of the longest service intervals in their class with up to 45,000-mile** oil and fuel filter change intervals. Plus, the DD5 features top-load oil and fuel filters for easier serviceability.
The DD5 and DD8 also come with, Detroit™ Connect Virtual Technician℠ remote diagnostic service. Virtual Technician will help you make informed maintenance decisions, so you only service your buses when needed. When one of your buses has to go into the shop, Virtual Technician, with the backing of the experts at the Detroit Customer Support Center, will provide access to in-depth diagnostic information to get your bus repaired as quickly and accurately as possible, improving uptime.
**Or either 18 months or 1,500 hours, whichever comes sooner.
Decreased Total Cost of Ownership
Watch the savings add up with the DD5’s and DD8’s longer maintenance intervals, improved fuel efficiency and insights through Detroit Connect Virtual Technician.
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 innovative technology enables efficient operation of the school bus’ aftertreatment system in low-speed stop-and-go operations.
What does this mean for you? Aftertreatment headaches of your current engines will become a thing of the past.
Ready to add the DD5 or DD8 to your fleet? For more information, contact a local Thomas Built Buses dealer.