Did I miss something, 385 HP for 2016 Ram diesel?

2015 ford 6.7s ,406 cu in, have 440 hp/860 ft lbs. In the mid 60's Chevy 327's were available with 350 and 375 hp. and were considered fast.
now even our Dodge caravan has 217cu in and 283hp and is not considered a fast car.

45Ricochet wrote:
Generally speaking a in-line Cummins will never have the HP a V8 diesel engine will put out.
Having said that I believe the newer ISX engines put out 600 HP which is just amazing to me. Of course they hold like 55 quarts of oil ( 14 gallons)

600 HP in a 15 liter engine is a lot less than almost 400 in a less than 7 liter engine. The over 2000 ft./lb of torque is pretty impressive though.

385/900 is very impressive. With the correct gearing it would move 80K at almost decent road speeds except on hills. Duty cycle would probably go in the toilet, which is why the 6.7 ISB in commercial apps is rated at considerably less hp.

Cummins12V98 wrote:
2013-2015 were available 385/865 for 16 they bumped tq to 900 they also increased SAE towing capacities.

This. And I think the HP is still determined by what transmission the truck has. 3 different numbers based on G56, 68RE or Aisin.

It has been years since RAM had the lead in HP.

naturist wrote:
Um, Horsepower is calculated by multiplying torque by engine RPMs, so you can easily up the torque while dropping the horsepower just by decreasing the engine red line. More practically, if you optimize the engine to produce peak torque at lower rpm, you will decrease the horsepower in the process.

X2
Generally speaking a in-line Cummins will never have the HP a V8 diesel engine will put out.
Having said that I believe the newer ISX engines put out 600 HP which is just amazing to me. Of course they hold like 55 quarts of oil ( 14 gallons) :w

naturist wrote:
Um, Horsepower is calculated by multiplying torque by engine RPMs, so you can easily up the torque while dropping the horsepower just by decreasing the engine red line. More practically, if you optimize the engine to produce peak torque at lower rpm, you will decrease the horsepower in the process.

well, the first part is true. HP is related to torque x rpm.

However, increasing low end torqued does NOT necessarily mean lower HP. with current engine management, valve lift and duration control etc. many many engines have increased low end torque considerably AND increased HP as well. This started in the early 1990's with variable valve timing and now includes variable lift and duration as well, along with intake runner control and length that varies with RPM.

I have two 1997 vehicles (same engine) with an engine introduced in 1990 with variable valve timing. If it had "fixed" timing based on high rpm it would have had a very lumpy idle with very poor low end torque. similar to mid 60's muscle cars. However there is over 30 degrees of timing change between idle and high rpm and low end idle is very good and incredible low end torque with a very flat torque curve.

At the time it was introduced (1990) it was one of the few normally aspirated engines giving well over IHP/cu in. Common today but very uncommon then.

Now larger diesels with lower rpm limits may not benefit as much, and I'm not aware of any of the Big 3 (cummins, duramax, ford) that do this yet, I'm sure they are playing with fuel and turbo management to maximize torque and HP.

Now you can "have your cake and eat it to" to paraphrase.

2013-2015 were available 385/865 for 16 they bumped tq to 900 they also increased SAE towing capacities.

Um, Horsepower is calculated by multiplying torque by engine RPMs, so you can easily up the torque while dropping the horsepower just by decreasing the engine red line. More practically, if you optimize the engine to produce peak torque at lower rpm, you will decrease the horsepower in the process.

Torque is generally rated at a much lower RPM, in the case of Cummins that means around 1800 RPM. HP is rated much higher on the RPM scale. Againin the case of Cummins that is around 3500RPM.
HP does not move loads torque does.
Just look at any class 8 truck. HP way less than 500,torque above 1100 is the norm.