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Navistar unveils 12.4 liter A26 engine

1 March 2017

International unveiled a new, 12.4 liter A26 diesel engine for Class 8 truck applications. The new engine is up to 5% more fuel efficient compared to the N-series engine it replaces, said Navistar.

Based on the MAN D26 engine platform, the inline 6-cylinder A26 produces up to 475 hp (354 kW) and 1,750 lb-ft (2373 Nm) of torque. The A26 features a variable geometry turbocharger utilizing a titanium compressor wheel with a simplified single-stage design. Larger piston pins, connecting rods and bushings help optimize load distribution for enhanced durability, while smaller piston cooling jets increase oil pressure to improve lubrication, increasing oil change service intervals up to 70,000 miles. The diesel particulate filter cleaning interval is up to 600,000 miles (966,000 km).

The A26 is 55 lbs (25 kg) lighter than the engine it replaces, and also enables a 200 lbs (91 kg) of additional weight reduction in vehicle-mounted components. Its Compacted Graphite Iron (CGI) crankcase, composite valve covers and shot-peened aluminum flywheel housing contribute to the weight savings.

Designed to deliver up to 5% greater fuel economy, the A26 features a simplified air management system, a 2,500 bar high pressure common rail fuel system and new cylinder head coolant passages that are 50% less restrictive to reduce parasitic loss to the water pump.

When paired with the new International LT truck, the A26 can provide up to 9% better fuel economy compared to a 2017 ProStar with N-series engine, said Navistar. The A26 is backed with a two years, unlimited miles warranty. The engine is already available for order and will enter production in April.

The renewed cooperation with MAN reflects the partnership between Navistar and Volkswagen. Last year, Navistar signed a strategic alliance agreement with Volkswagen, and VW acquired a 16% stake in Navistar. VW owns a controlling interest in MAN Truck & Bus.

Source: Navistar