6.9L IDI vs. 6.7L Power Stroke

Ford Diesel - Old vs. New

Ford entered the diesel industry with a mere 170 hp & 338 lb-ft of torque. Believe it or not, this was considered a lot in 1983, and the highly sought after International 6.9L had a great reputation of reliability. It is amazing how far Ford has come in the diesel market today, offering their own, Ford Motor Company built 6.7L Power Stroke with 400 hp and 800 lb-ft of torque. Though naturally aspirated worked "back in the day", Ford did not even settle for a standard turbocharger on their new design. Rather, they equipped the 6.7L with the top of the line DualBoost, twin compressor turbocharger.


6.9L idi

1983 6.9L International IDI

6.7L Power Stroke

2011 6.7L Power Stroke


International (Navistar) 6.9L idi V8 Diesel

Ford 6.7L Power Stroke di V8 Diesel

Years of Operation:

1983 - 1987

2010 - present


6.9L, 420 cubic inches

6.7L, 409 cubic inches


Naturally aspirated.

DualBoost turbocharger (twin compressors)

Injection Type:

Indirect injection, mechanical injection pump, mechanical injectors.

Direct injection, high pressure common rail, electronic injector controls.

Block/Head Material:

Cast iron/cast iron

Compact graphite iron (CGI)/aluminum


170 horsepower @ 3,300 rpm

400 horsepower @ 2,800 rpm


338 lb-ft @ 1,400 rpm

800 lb-ft @ 1,600 rpm


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