FORD 6.9L & 7.3L IDI
The 6.9L and 7.3L IDI engines, developed and built by International Harvester and the later International Navistar, predate the technology savvy Power Stroke engine family. Simplistic in nature, the IDI engines are rugged and dependable, albeit comparatively short on power by today’s standards. The International 6.9 and 7.3 IDI engines produce honest, respectable power figures with reasonable fuel consumption. The 6.9 was only offered as a naturally aspirated engine, while the 7.3 was offered in both N/A and factory turbocharged applications.
7.3L Power Stroke

The 7.3L Power Stroke diesel was developed as a the replacement for the aging 7.3L IDI. Although the engines share identical displacements, the designs are of completely different nature and it would be incorrect to suggest that the 7.3L Power Stroke was an evolution of the IDI engine family. The Power Stroke is a turbocharged, direct injection diesel engine produced by International Navistar. The “Power Stroke” trademark belongs to Ford Motor Company, and therefore you will only find the 7.3 “Power Stroke” in Ford applications. The engine is based on International’s model T444E engine, which is identical save for some slight variances specific to Ford’s applications.

6.0L Power Stroke
The 6.0L Power Stroke was introduced for the 2003 model year and offered alongside the 7.3L Power Stroke for this single model year. By 2004, the 7.3L was completely phased out in favor of International’s new, highly advanced 6.0L Power Stroke. The engine was backed by Ford’s 5R110W TorqShift transmission or a ZF 6 speed manual unit. In the performance department, the 6.0L Power Stroke was far superior than its predecessor which, amongst other reasons, was ultimately retired because of its failure to meet stricter emissions regulations of the time period and even stricter demands on the horizon. Among the many selling points was a variable geometry turbocharger that provided quick throttle response and the TorqShift transmission, which provided crisp, positive shifts.
6.4L Power Stroke
The 6.4L Power Stroke was introduced for the 2008 model year. Strict emissions regulations and the overall questionable reliability of the 6.0L were primary factors that presented a need for a new, clean slate engine design. Quieter and cleaner than its predecessors, the 6.4L Power Stroke was the first engine introduced to the market that utilized twin turbochargers from the factory, and remains the only engine to feature such a turbocharger arrangement. This was also the first Power Stroke to use a diesel particulate filter (DPF) in order to nearly eliminate particulate emissions (soot). The new DPF and active regeneration system greatly hindered the engine’s fuel economy capability, though the engine proved to be comparatively strong and reliable.
6.7L Power Stroke
Codenamed the Scorpion during its developmental stage, the 6.7L Power Stroke is Ford’s in-house built diesel engine for the Ford Super Duty. Ford chose to design, engineer, and produce its own diesel engine to maintain profitability and a competitive edge in the growing diesel segment. This is the first Power Stroke not manufactured by long time partner, International Navistar. The absence of a partner seems to have given Ford an advantage over competitors, granting them the freedom to design an engine that fits their specific needs and the needs of their customers. Currently this engine is rated for 440 hp and 865 lb of torque.

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