International Truck and Engine Corp. says drivers are going to be the primary beneficiaries of its new 2002 emissions-compliant VT 365 V-8 diesel engine.
Designed to replace its-T 444E engine for medium-duty trucks, International says the VT 365 line provides better acceleration and less noise, despite its smaller size. The new engine is a 6-liter diesel with displacement of 365 cu. in., while the T-444E is a 7.3-liter with displacement of 444 cu. in. Horsepower ratings are 175, 195, 215 and 230 hp. at 2,600 rpm, with up to 620 lb.-ft. of torque.
The key to the VT 365's increased performance, despite tighter emission controls, rests on several components. First is the Electronic Variable Response Turbocharger (EVRT), which provides improved throttle response and peak torque capability at lower rpm levels. Second, it is equipped with Electro-Hydraulic Generation Two (G2) fuel injection technology, which is based on a low-pressure common rail fuel system. Finally, Intuitive Shift controllers allow for smoother driving to compensate for the use of cooled Exhaust Gas Recirculation (EGR) technology, which cuts oxides of nitrogen (NOx) emissions.
“The VT 365 has four valves per engine cylinder, compared to two valves per cylinder in the T-444E. That gives the VT 365 better air-flow capability, which translates into better acceleration for drivers especially in stop-and-go environments,” says Mark Wildman, International's field service manager.
The G2 fuel system uses high-pressure injectors developed jointly by International, Sturman Industries and Siemens Diesel Systems Technology to more efficiently manage fuel consumption. Higher injection pressure combined with four valves per cylinder increases performance and fuel economy while lowering emissions.
The EVRT turbocharger has a wider range of capabilities, in essence acting like a small turbo for instant response at low speeds, while working like a large turbo when more airflow is needed at full power. The Intuitive Shift controllers, introduced last year, integrate the VT 365 engine and Allison's automatic transmission. It is designed to shift at the “optimum moment” for every load and driving condition, with the system's electronics calibrated to anticipate how an expert driver would shift using a manual transmission.
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