The Bosch high pressure common rail fuel system for the 6.7-liter Power Stroke V-8 operates at up to 30,000 psi
We've told you the details of Ford's new 6.7-liter Power Stroke V-8. Now, here's audio of how quiet it is.
The Bosch common-rail fuel system operates at up to 30,000 psi to send fuel to the engine’s 8 piezo injectors — one per cylinder. Each injector nozzle has 8 holes and can deliver up to 5 injections per combustion cycle. Two pilot injections control noise levels, and a main injection is used for the power-generating combustion event. Two variable post injections are used to produce extra torque and for heating up emissions catalysts that scrub NOx and eliminate soot downstream from the engine. While cruising, only 3 or 4 injections will be needed.
What you hear at the start of the recording (about 5 seconds into the clip) is the engine firing only on the main injection event. The loud clatter makes it sound like an old 7.3-liter Power Stroke. A few seconds later the two new pilot injections are added. The result is something you have to hear to believe.