F450 vs Ram 3500 DRW tow vehicle

4x4ord wrote:
You can increase an engine's displacement/torque by increasing bore, stroke, or number of pistons. The Cummins and Powerstroke are both 6.7 liter engines so will have similar cylinder pressure when they are making 1000 lbft of torque. Stroke vs bore makes no difference. Torque is a function of the fuel burned per revolution. Increasing the boost or the bore or the stroke puts more air in the cylinder to allow for more fuel to be injected. If you can burn 10% more fuel per revolution you should see about 10% more torque.

You are describing a gas engine here, not a diesel. A diesel is regulated by fuel, not air. In order to increase boost in a diesel, you have to increase fuel. A diesel basically adds fuel and utilizes what ever air is available which is why turbos generally make diesels more efficient since it adds more air that what it can naturally take in. You can "artificially" alter the peak with fuel and boost control with a VG turbo.

Also, a bore/stroke ratio, along with the cam, does play a huge role in an engines efficiency and when it is most efficient.

We are at another disagreement. On the last disagreement, you said that you highly doubt that my truck gets better fuel economy pulling mt RV in 5th than 6th because you never seen a BSFC showing that. I proved that it does get better fuel economy with a BSFC map. So prove me wrong. Show me a BSFC of the 6.7L Powerstroke. If you can't, then it is all subjective.