The 7.3s and 5.9s were both officially duty tested and scored the same longevity points.
When it comes to what you see on the road? Here in central NY I see more 80s-early 90s Ford diesels then Dodges. But I also see more 3.9 and 5.9 Cummins being used in other things after the trucks were scrapped.
There is no doubt that the Cummins is more fuel efficient and most have better injection systems.
Comparing a T444E (7.3) to a DT466 is an apples-to-oranges comparison. They are in separate duty classes. One is a space-saving "lightweight" and the other a replaceable sleeve "heavyweight."
International T444E has a B10 of 200,000 miles. B50 of 350,000 miles.
International DT466E has a B10 of 300,000 miles, and B50 of 450,000 miles.
I still have a 1994 F250 with the IDI 7.3 turbo and also have a 1992 Dodge with the 5.9 turbo-intercooled. Both have over 350K miles and both run perfect. The Dodge outpulls the Ford and gets 2-3 MPGs better while doing it. So the Dodge with a smaller engine and 3.50 axle ratios outpulls the Ford with a bigger engine and 4.10 axle ratios.
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Today's Featured Article - History of the Nuffield Tractor: Part 2 - by Anthony West. In February 1953 production of the ETC T.V.O engine started, ready for the March 1953 press announcements. The new TVO engine had a number of improvements which resulted in a 10 per cent more power (43bhp as against 38 bhp on the earlier engine) and 10 per cent more fuel economy. Some of the improvements are listed below: Redesigned combustion chamber, improved spark plugs and positioning, plug size 14mm(earlier size 18mm).
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