Posted by jdemaris on September 27, 2008 at 06:32:38 from (72.171.0.149):
In Reply to: OT 6.5 Chevy diesel posted by biggerred on September 26, 2008 at 19:21:10:
It is the lightest V8 diesel ever made in the US, and was never intended for severe duty. Detroit Diesel originally was asked to design it as a direct-power replacement for 305 gas engines - with fuel mileage in mind - NOT heavy use. Started out as the 6.2, then got bored to 6.5 with an added turbo, and then added electronic fuel controls. Military 6.5s retain the mechancial fuel systems.
I've gotten over 200K with several, and 520,000 miles on one. But, that's NOT with heavy use.
The Ford 6.9 and 7.3 is built much better, and the Cummins 5.9 better yet.
6.5 has a light block that has cracking problems in the main-bearing webs - and sometimes #8 cylinder. Main bearing cap-bolts were downsized from 12MM to 10MM in later engines to keep blocks from cracking. Also has a cast-iron crankshaft that sometimes snaps in two. Also uses a timing chain instead of gear drive. Also has light cylinderheads that are prone to cracking and most have no hardened seat-inserts. From 1994 and on, 6.5s had awful problems with electronic fuel controls. Many later got updated and somewhat fixed.
Compare to a Ford-IH 6.9 and 7.3. Much heavier block, forged steel crankshaft, gear-drive cam and injection pump, and much heavier heads with hardened inserts. 6.9 and 7.3 was also durability tested and rated for HD use. Pretty good considering IH built if from an existing truck gas-engine format. Made off the MV404 and 446 gas-engine basis.
I won't even mention all the specs on the Cummins 5.9. It's a true long-stroke truck engine and worlds different than the aforementioned.
GM 6.2s and 6.5s weigh 650 - 700 lbs. Ford IH 6.9 and 7.3s weigh 900 - 950 lbs. Cummins 5.9 weighs 1,036 lbs.
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