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It’s an oddball design which actually works quite well, and its advantage over mechanical injection pumps like the P7100 is its ability to vary injection timing for a broader power curve. While the Cummins engines of the day used a poppet injector, Ford (technically International) used a design which has seen heavy use in commercial and industrial engines, HEUI, or Hydraulic Electronic Unit Injection.
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Both were manufactured by Navistar International, but there were several key differences that made the Powerstroke superior to the IDI version, and top of the list was the addition of direct injection. The 7.3-liter Powerstroke is often confused with the 7.3-liter IDI which was used in Ford pickup trucks from 1988 to 1994. While it was never known to be a racehorse, its reputation was that of being one of the most reliable and overbuilt engines to hit the road in a production truck, but as always, you’ve got to wonder, what breaks when? Well today, we’re gonna find out. To this day, it remains the largest displacement diesel engine ever installed from the factory into a pickup, but the question remains: was bigger truly better? Why hasn’t anyone come close to matching its displacement? The two runners up are the 6.7-liter Cummins and Powerstroke, but those are still 36 cubic inches smaller than the 7.3-liter behemoth. In the early 90’s when Dodge and Chevy were putting mere 5.9- and 6.5-liter diesels into their trucks, Ford raised the bar with its juggernaut powerplant, the 7.3-liter Powerstroke. You’ve heard the phrase “bigger is better” many times in your life, especially when talking about engines. Written By: Lawrence “LT” Tolman 7.3 Powerstroke 1994 To 2003: The Big Block of Diesels