Ram HD 1000 lb-ft MPG loop

RoyJ wrote:
So you're saying given the exact same displacement, and the same metallurgy of the components - their operating life remains identical regardless of stress level?

Yes, at least from what I have seen in the dyno cells when I worked at Cummins. The crank and the internals can handle well over what the pick up truck puts out(I am talking hundreds, not tens) without any significant or even notable reduction in B10 and B50 life percentages. Have you seen otherwise in any of the engines you dyno tested when working for an engine manufacturer?

The first draw back is the turbo especially on the turbine side. It is a major bottleneck and causes temps to rise quickly along with high drive pressures which puts a strain on internals(and head gaskets). However, it was made to control emissions at all rpms like all stock VG turbos. It, like the rest of the hardware and tuning is made to meet emissions and therefore very conservative in regards to what it can actually handle.

RoyJ wrote:
Wouldn't it be more reasonable to state Cummins charge more for high hp rating engines, because they have a higher probability to incur in-warranty repairs?

We can also look at it the other way and say Cummins gives you a discount when you order a "de-rated" engine, because it's much less likely to fail.

Nope, it would not be reasonable at all. At least not with my 20+ years of experience in the medium/heavy duty industry working for various engine/truck manufacturers and dealership groups. How many years have you been the industry to come up with that theory?