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While I like the Duramax 6.6 engines, but I like Detroit V8 engines more because they have more horsepower than the Duramax. The Detroit 6.5 diesel engines have 516 horsepower. It can carry up to 1650 lbs and it its top speed is 2100 rpm.
Your post makes no sense. The 6.5 light duty diesel that came in the GM pickups was rated at 215HP and 440 ft lbs of twist@3200 rpms, at max output. It was rated to carry nothing. Max rpms for the engine design was 4200 rpms. The 6.5 was a poor design for the injection pump. Detroit cheaped it out by putting the drive gear on the timing chain rather than the far more stable crankshaft. When the timing chain got loose, the injection timing was all over the place. The main bearing webs were known to crack, heads were known to crack, and the crankshafts were known to fail due to poor harmonics control. Not exactly a primo engine design even though it is a cousin to the 8.2, which is one the better medium truck diesels out there.
^^ You're right that my post didn't make any sense. The reason why I prefer the 6.5s because I am used to older engines. The 6.5s only have 190 horsepower. It was replaced by the far more popular Duramax 6.6. They were never meant to compete against Ford or Dodge; the following vehicles used the 6.5: Chevrolet Blazer, Chevrolet 2-Door Tahoe, GMC Yukon, Chevrolet/GMC Suburban, the Chevrolet C/K Silverados, the GMC C/K Sierras, the Hummer H1, and the military Humvee (though the Humvee still uses it). One major problem with the 6.5 is crank failure. Another problem is a cracked cylinder head, a similar issue with the Ford 6.0 powerstrokes. Higher mileage 6.5s can have this type of issue.
Duramaxes are good engines but when the early Duramaxes came out, the LB7 had injector problems as well as blown head gaskets.
GM covered the injector issues up to 150,000 miles for free. Also keep in mind the head gaskets usually were directly related to "hot rodding" the engines with aftermarket parts.
GM covered the injector issues up to 150,000 miles for free. Also keep in mind the head gaskets usually were directly related to "hot rodding" the engines with aftermarket parts.
GM covered the injector issues up to 150,000 miles for free. Also keep in mind the head gaskets usually were directly related to "hot rodding" the engines with aftermarket parts.
Which is common for any diesel that's has had a tuner plugged in to it.
But that's usually the case..... manufacturers are coming up with more technology that consistently bumps up the power ratings on diesels. The thing is..... diesels can be a lot more powerful than manufacturers let them be. With emissions laws they are trying to squeeze as much power out of the engine as they can within their safety margins while remaining within EPA regulations. A properly set up truck with a tuner will last forever. The problem is most people cannot keep their foot out of them. Anyhow, I digress.
The 6.5 was one of the worst diesel engines to find its way into a truck. There was nothing reliable about them. Dad got suckered by my cousin into trading a 99 F250 (5.4L V8) for a 95 GMC 3500 with the 6.5L in it. At 90k miles it had already been through one engine replacement. In the short time that he owned it we replaced the PMD (pump mounted driver) twice (finally relocating it out of the engine bay to reduce heat soak), oil pressure switch, lift pump, injectors, and a harmonic balancer.
The 6.5L was extremely anemic and it's best case was 215 HP/ 440 lb-ft torque. Typically you found them with 180 HP/360 lb-ft torque until the very late years. The engines were meant to be an "affordable diesel" option and weren't built with longevity in mind. Finding one that broke 300k miles was a sight to see. Rest assured it wasn't trouble free.
In case you weren't aware, here are some of the most of the common issues with that engine:
Lift pump (rough running, power loss, overworking the IP)
IP failure (no start, won't run)
Oil pressure switch (no start)
Harmonic balancer (deteriorates causing a broken crank)
Crank pulley (deteriorates causing a broken crank)
Weak block casting (cracked main webs, cracked head bolt holes, cracked cylinder bores)
Cracked heads (cracked valve bridges, head gasket failure)
Poor head gasket clamping design (head gasket failure)
Injectors (running rough, smoking, loss of power, and in extreme cases a hole in the piston)
Vacuum turbo control system ( low power, rolling black smoke, overheating, engine failure)
PMD overheat (no start, intermittent shut down while driving, all the way to engine run aways)
I would rather have 10 6.4L Powerstrokes before I would own one 6.5L. The 6.6L Duramax all in all is a good engine. A few had injector issues but GM covered those. The only other problem they suffered from years ago were water pump failures. Once GM got that handled the engines are about as reliable as you could ask for.
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