Volvo’s VE D12: Flap HP Curve Makes Mountain of Difference

Volvo Trucks North America says drivers will get a more satisfying kick out of its 465-horsepower VE D12 diesel, given its flatter power output curve. Volvo says the EGR-equipped engine has the same 1,650 foot-pounds peak torque of its non-EGR predecessor, but its ability to hold 465 hp from 1,500 rpm through 1,825 rpm means drivers can access peak power throughout more of the engine’s range.

Volvo attributes the engine’s improved power to its V-Pulse technology, which uses the normal pressure pulsation in the exhaust manifold to attain the level of EGR needed to cut emissions. Exhaust escapes the combustion chamber just as the exhaust valve opens, similar to the pressure release when you open a can of soda. Pulses from each cylinder are captured and fed through a twin-path EGR cooler to provide the gas needed for recirculation. The recirculation lowers the oxygen content of the intake charge, and holds down the formation of oxides of nitrogen (NOx). This method of EGR allows the turbocharger boost pressure to remain higher than the exhaust manifold back pressure, achieving what Volvo engineers call a “positive pumping loop,” which provides better fuel economy, without compromising horsepower.

Another useful feature: an exhaust pressure governor, which allows idling in cold climates, if necessary, at only 650 rpm. You’ll save a half-gallon of fuel per hour over competitive engines, the company says.

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