Ford 6.7L 1050 ft lbs TQ at 1,600 rpm, 475 HP at 2,800 rpm

4x4ord wrote:

ShinerBock wrote:

As far as the big diesel versus smaller diesel making the same power, of course the bigger diesel will be able to sustain those power numbers better because it is able to move more air for the amount of fuel needed to make 515hp. Although, 515 hp is about 450 at the wheels which is my level 2 tune. When I was tuned, but had my emissions system, I could barely sustain that power level towing 5k under high load. When I was tuned and deleted, but had the stock turbo, I could maybe tow about 8k-10k sustained at that power level. Now that I have a larger turbo with more air flow, I can easily tow my 14k trailer sustained at that power level.

The industrial diesels move a little more air per HP but when you actually do the math the numbers might surprise you.

A Cat C13 can be speced to produce 520 HP (and we have Cat C13s in some of our equipment where they produce up to 543 HP) The C13s produce peak HP from 1800 rpm to 2100. So it is designed to run all day long delivering 520 HP @ 1800 rpm.

The C13 has a displacement of 12.5 liters. So at 1800 rpm it can produce 520/(1800 x 12.5) = .023 HP/rpm liter. If the Powerstroke were tuned to produce .023 HP/rpm liter it would make 431 HP (.023 x 2800 x 6.7). So although the industrial engine at 1800 rpm produces less power per litre displacement it doesn't pump a whole lot more air per HP produced when compared to the Powerstroke at 2800 rpm.

A C13 did not produce 520 hp. At least not on any stock on road truck. The max the C13 produced was 430 hp. The C15 was the one that created 520 hp and more. You are also not counting for air flow from the turbo (since it changes and engines effective displacement) and compression ratio.