December 27, 2013
The No. 2 Successful Dealer article from 2013 featured an in-depth look at choosing between 13 and 15 liter engines. It managed to hold its spot near the top of the year’s most popular articles despite being one of the first articles published in 2013.
Today’s heavy-duty diesel engine evolution has settled on two basic displacement configurations: 13-liter and 15-liter, the larger of which led North American sales for many years. Lately, however, 13-liter engines have emerged as the overall market leader.
We’ve been doing a lot of research on these engines lately, and we are seeing a shift away from 15-liter engines to 13 liters,” Kevin Baney, chief engineer for Kenworth Trucks, says.
Navistar saw the trend toward 13-liter power coming some years ago as customers became more focused on weight, payload and fuel efficiency, which Steve Gilligan, vice president of vocational and product marketing, drove the company in development of its MaxxForce 13.
Jennifer Rumsey, executive director of heavy-duty engineering for Cummins, notes that most of today’s 13-liter engines actually are 12- to 13-liter engines. While engines in this class have displacements ranging from 11.9 to 13 liters, 13-liter and 15-liter displacements fill different needs within the Class 8 truck market, she says.
Ed Saxman, drivetrain product manager for Volvo Trucks, says Volvo had a 12-liter engine that it increased to 13 liters due to power density so that the top rating could be increased to a full 500 horsepower with 1750 lb.-ft. of torque and also introduced their 11- and 16-liter engines to be able to offer additional lighter-weight and higher power options.
The original article can be found in its entirety here.