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Automotive Industry

6.0L Power Stroke is torque of the town - Engine Technology - diesel engine from Ford

Automotive Industries, Oct, 2002 by Rob Wilson

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The intake manifold contains a path for coolant from the EGR cooler to the front cover, It also has a passage for the EGR gases to travel to the EGR valve where they mix with compressed intake air.

On the exhaust side, combustion gases move through the exhaust manifold to drive the turbine side of the EVRT. When exhaust back pressure is higher than intake manifold pressure, the EGR valve opens and part of the exhaust gas is bled through the EGR cooler back into the intake manifold and combined with intake air. The purpose of all this, of course, is to reduce [NO.sub.x] emissions.

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The EVRT is electronically controlled, but hydraulically actuated, By closing and opening the turbine vanes, the turbo can provide variable boast to adapt to speed and load conditions in addition to altitude compensation and shorter engine warm-up cycles.

The fuel system is also electronically controlled and hydraulically actuated. Ford and International refer to it as a hydraulic rail fuel injection system rather than a common rail system since it does not pressurize fuel in a common rail. Hydraulic oil is pressurized instead.

Principal components include the ECM, injector drive module (IDM), high-pressure oil system, lubrication system, fuel supply system, unit injectors and 13 different sensors, In the system, pressure is supplied via a Bosch Rexroth high-pressure hydraulic pump.

But the Siemens G-2 injectors are perhaps the most interesting components in The system. They employ The digital latching valve technology first developed by Eddie Sturman of Sturman Industries. This technology uses the properly of residual magnetism to hold the fast-acting spool valves in either of two positions--open or closed.

Two 48-volt 20-amp coils control The position of the spool valve. They are pulsed by the IDM for approximately 800 [micro]sec The injector multiplies the pressure in the oil rail by a factor of 7.1. So with the oil rail pressure of a maximum of 260 bar (3,770 psi), the injection pressure is intensified to as high as 1,800 bar (26,100 psi) during injection.

The engine lubrication system has an integral oil cooler mounted in the Vee of the engine under the oil filter. It has an oil pressure test port in front of the oil cooler. There are oil passages on the outside of the crankcase to reduce the chance of oil leaks.

The cartridge style oil filter from Racor mounts on the top of the engine and drains to the oil pan during servicing. When the filter is removed the oil filter housing drain valve opens automatically to drain most of the oil from the housing. The element changes out pretty much like a printer ink cartridge. Clean as a whistle.

The same filtration system is employed on the new five-speed automatic gearbox, although there it is chassis mounted.

"The new five-speed is just as important as the engine," claims Ford's Freese. "The significant changes between the four-speed and the new gearbox are in the cooling and filtration systems. In some cases, the coolant passages have been doubled. Keep it cool. Keep it clean. Those are basics."

Automotive Industry

6.0L Power Stroke is torque of the town - Engine Technology - diesel engine from Ford

Automotive Industries, Oct, 2002 by Rob Wilson

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