![]() During disassembly and inspection, we were more than pleased with our design criteria being met easily based upon million-mile wear observations.” Our 13-liter Mack MP8 engines have accumulated a phenomenal amount of miles. “There is a perception that bigger is better for a long-life engine – I strongly disagree. “The older thinking was to buy a larger engine and run it easy – it’ll get good fuel efficiency and last forever,” says David McKenna, powertrain sales and marketing manager for Mack Trucks. 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. 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. “The added weight of emissions-related equipment and fluid is offset by the 13-liter engine.” Daimler’s Freightliner and Western Star brands supply 13-, 15- and 16-liter diesel engines, including the DD13, from its in-house Detroit lineup. “That’s what drove us in our development of our MaxxForce 13,” Gilligan said. Navistar saw the trend toward 13-liter power coming some years ago as customers became more focused on weight, payload and fuel efficiency, said Steve Gilligan, vice president of vocational and product marketing. “Our broad horsepower range works for most customers.” “With our Paccar MX-13 engine today, we can offer them 385 horsepower all the way up to our 500-horsepower option, which will debut in January,” he says. More line-haul customers are switching because of weight reduction and fuel economy benefits, Baney says. ![]() ![]() “Correct engine sizing is the base from which to optimize performance.” – David McKenna, powertrain sales and marketing manager, Mack Trucks ![]() “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,” says Kevin Baney, chief engineer for Kenworth Trucks. Lately, however, 13-liter engines have emerged as the overall market leader. 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. ![]()
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