Posted by jdemaris on August 10, 2009 at 06:32:53 from (67.142.130.46):
In Reply to: o/t older ford diesels posted by chris yoder on August 09, 2009 at 18:55:46:
The 6.9s and IDI 7.3s are very rugged engines. Not very powerful without a turbo though, and not very fuel efficient. Internation Harvester developed them from existing truck gas engines. I still have two. With the IDI engines sold up to mid-1994, the 6.9s and 7.3s are the same engines, but the 7.3 has a slightly larger bore and therefore, thinner cylinder walls. That creates the need to use coolant conditioner to prevent pinholes from cavitation.
One of my trucks is an 85 F250 4WD with extended cab. C6 trans (no overdrive) and 4.10 axles. 260,000 miles and runs perfect, but only gets around 13 MPG on the highway when empty. When loaded, it's not much different. Engine has never been apart.
My other is a 1994 F250 4WD with extended cab. Engine is the 7.3 turbo IDI (last version before the DI Powerstroke came out). It has 330,000 miles and also runs perfect with no engine repairs ever except for routine water pump and injector nozzle changes and injection pump reseals. This truck has the E40D trans with overdrive and 4.10 axles. I drove it around the mountains of New York for years and it never got better than 15 MPG on an empty highway trip. Now I've got it up in northern Michigan with NO mountains to climb, and I've gotten 17 MPG with it. The OEM ATS turbo setup runs around 7 PSI at max boost since the indirect injection limits it.
I'll add that I had many friends that bought Ford diesel trucks over the years since they first came out. I heard a lot of bragging about good fuel mileage - but every one I actually checked myself rarely did better then 16 MPG, and 14 MPG was more the average for highway mileage in a 4WD truck.
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