Diesel vs gas......................

transamz9 wrote:

OhhWell wrote:

transamz9 wrote:

Taco wrote:
A B10 number is the design life of the engine. It is a number that supposedly 10% of the engines will have an engine internal breakdown in this number of miles. The B50 or 50% is usually not a huge amount after this number.

The number is higher on the duramax because it has a 20k mile longer design life. The idea that a diesel engine lasts forever hold some truck for a class 8 tractor or a locomotive or a diesel ship but for a pickup it doesn't hold water. Even lots of medium duty truck are running around with 300-350k design life engines. I believe the powerstroke is very similar design life to the duramax. The cummins in the ram may be longer, I know it is longer for the version of the engine that goes in the medium duty trucks but the one in the pickup has a hotter tune and may very well be a shorter life.

I guess what I'm getting at is when looking at the current fifth wheel towing guide for the 3500 GM, the max GCWR for the 6.0 gas with 4:10 is 20,500# and the max GCWR for the 6.6 with 3:73 is 30,500#. When doing the b10 do they figure these trucks at max for the miles, 50%, 10%? Because if you figure that a person grossing his 6.0 at 20,500# or he could buy the Duramax that is rated at 10,000# more. Those b10 would really start spreading out more. Make sense?

Makes sense. I don't know if I've ever seen GCVWR used in B10 statements. My initial assumption would be that it is assuming the curb weight of the base model with a single 150lbs driver and half a tank of gas....

So they are saying that a 6.6 Duramax is only built to last 220,000 miles at it's lightest weight? WOW! How do we even make it to a 100,000 miles with these things towing our heavy campers and such?

Defined:
B10 Life

The expected engine life, measured in miles of operation, before 10 percent of all engines in operation will require major repair(s), overhaul, or replacement.

Example: The 7.3L Power Stroke has a B10 life of 200,000 miles. Therefore, 10 percent of all engines in operation can be expected to require an overhaul at/near 200,000 miles.


B50 Life

The expected engine life, measured in miles of operation, before 50 percent of all engines in operation will require major repair(s), overhaul, or replacement.

Example: The 5.9L Cummins has a B50 life of 350,000 miles. Therefore, half of the engines in operation can be expected to require an overhaul at/near 350,000 miles.



An "overhaul" or "major repair" is considered a repair that requires removal of the cylinder heads or dropping of the oil pan. Failure/replacement of components that are accessible without removing the heads or dropping the oil pan do not attribute to B10/B50 life expectancy.