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Ford's New Power Stroke

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On: Wed, Sep 2, 2009 at 2:54PM | By: John Welch

Ford's New Power Stroke

Deciding that the engines they have purchased from supplier Navistar were more trouble than they are worth, Ford has designed and constructed their first pick-up truck diesel. The 'Scorpion' 6.7-liter V-8 diesel has many innovative features that contribute to lower emissions and NVH. Each set of valves has its own rocker configuration, the block is cast of a lighter iron, the cylinder heads are now aluminum. On top of those improvements, the motor has a unique turbo set-up.

Most engines accept air through the valley between the cylinders and route exhaust out tubes attached to the outer face of the engine block. The 'Scorpion' does things differently. In order to make maintenance less labor intensive (the old Navistar lump positioned its turbos in a way that required removing the cab in order to service them), Ford has stacked the turbos on the same prop shaft and placed them in the valley of the engine. Downpipes are fed hawt exhaust from the top of the cylinder head. The intake tracts accept air from the turbo from pipes routed around the front and sides of the engine.

All of the changes add up to a much quieter diesel, as evidenced by this way over-used audio clip. The first engine is the old Power Stroke motor; right at 10 seconds the audio switches to a recording of the new 'Scorpion':

So, even though it's still pretty loud, it is quieter. The Chevy Duramax has employed a similar turbo setup, but it does not feature the dual turbos or lighter iron block.

pickuptrucks.com has a thorough report on Ford's new baby

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