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Re: 6.5 pics
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Posted by jdemaris on June 05, 2007 at 06:12:00 from (66.218.18.77):
In Reply to: Re: 6.5 pics posted by mj on June 04, 2007 at 22:14:24:
I've read the same classifications - but it's not that simple. The EPA uses a light-duty and medium-duty classification that is totally different then the truck engine duty classification uses.
Some Ford-IH diesels are projected to last as long as the Cummins. There is no doubt that the Cummins is built very heavy as compared to other engines used in pickups. That being said - some of the newer Ford-IH engines carry exactly the same duty-rating as the Cummins. The trucking industry rates projected engine life with a B-rating. That is a projection on how long an engine will last with heavy use (not just cruising empty) - before any major teardown. GM Duramax has a B10 rating of 220,000 miles (that means 90% make it, and 10% don't). Cummins 5.9 has a B10 rating of 250,000 miles. The new Ford-IH 6.4 liter has a B10 of 262,000 miles. The older Ford-IH 7.3 has a B10 of 200,000 miles. GM 6.5s - as far as I know - were never tested and rated for heavy use. Odd thing is - the B50 ratings - being a point where 50% make it, and 50% don't. The Ford-IH 7.3 and the Cummins 5.9 are the same at that point - 350,000 miles. I guess that means that more Ford-IHs fail early - but those that make it beyond a certain point last a long time. Another note- is the new compact Cummins V-8s for light trucks e.g. SUVs and 1/2 tons. Cummins claims the new 4.2 liter V-6s and the 5.6 liter V-8s will have a B10 of 325,000 miles.
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