28,500 lbs Ford vs Ram 1 ton DRW

BigToe wrote:

Does Cummins identify, on any literature, website, or federally mandated document, that the 6.7L destined for pickups is certified per J1995, similar to how Cummins identified in the brochures of the two different M11s above as being certified per J1349?

In instances like the fire pump spec sheet that you posted where Cummins is the end product manufacturer, they use J1349. In instances where they only make the engine and not the end product, they use J1995. Again, J1349 is for manufacturers that design the end product, and J1995 is only for engine manufacturers that supply the engine.

The same goes for Cummins diesel generator sets where they make the end product. However, in some of their gas engine gen sets where they do not make the engine, those are J1995 certified by their engine supplier. It is not like they get a choice in the matter on which one they wish to go my, J1995 is for when you are an engine suppliers, J1349 is for when you produce the end product, and J2723 still uses either method but with an extra step of having a SAE witness. That is all.

BigToe wrote:
Is it possible that Cummins does use J1349,

Cummins does use J1349 when they are the manufacturer of the final product. However, in regards to the vehicle engine we are talking about, Cummins is NOT the manufacturer of the final product so they have to use J1995.

BigToe wrote:
Can we at least agree that SAE J1995 is commonly referred to as the test for gross horsepower without engine driven accessories, exhaust systems, or emissions control devices? And can we also agree that SAE J1349 is commonly referred to as the test for net horsepower, still measured at the flywheel, but inclusive of the induction, exhaust, and after treatment systems as the engine would be expected to be configured in use?

While J1995 is considered "net" power, this does not mean the engine manufacturer does not simulate or actually add these systems when testing. You can easily simulate the CFM of an intake or the back pressure of an exhaust with emissions in a test cell. They will sometimes denote this by saying the power ratings are "restricted" J1995 ratings meaning the restrict the power ratings to meet all emissions. They can even simulate other losses from things such as the fan clutch, alternator, and/or A/C compressor to even more load then they actually produce. You can even add these devices when testing like Cummins has done many times when certifying J1995 power rating. However, this is voluntary engine manufacturers under J1995, but is required for end product manufacturers using J1349.

Also there is nothing stopping Ram from certifying the Cummins in their trucks under J1349, but that is kind of pointless and most end users (besides fanboys of course) don't actually care about such things as log as it pulls the load.

I am not going to comment on the rest because I have a feeling I will just be repeating myself.