Torque Calc: 304HP Diesel Engine at 1600rpm

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Discussion Overview

The discussion revolves around calculating the torque of a 304HP diesel engine at 1600rpm, given that the engine's power rating is specified at 2500rpm. Participants explore methods for estimating torque and the challenges associated with such calculations.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about calculating the engine's power at 1600rpm based on its 304HP rating at 2500rpm.
  • Another participant suggests that at a constant speed, there is no net torque, and proposes measuring torque through fuel consumption and efficiency or by loading the engine.
  • A different participant states that while 304HP at 2500rpm corresponds to 638lbft of torque, it is uncertain how this value translates to 1600rpm.
  • Some participants agree that modeling can provide estimates, but emphasize that actual measurements are often more reliable than theoretical calculations.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of calculating torque at 1600rpm, with some advocating for measurement over calculation. There is no consensus on a definitive method for determining torque at the lower RPM.

Contextual Notes

The discussion highlights limitations in estimating torque due to the dependence on engine characteristics, fuel efficiency, and the potential variability in performance at different RPMs.

mectarek
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we have an industrial diesel engine that produces 304HP @ 2500rpm.

I want to calculate the torque but at 1600rpm..so how can i calculate its power at the 1600rpm?
 
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Welcome to PF;
At a constant speed - there is no net torque. Energy is used at the same rate (power) as it is supplied.
You want to know how much torque is available. You could get that from the rate that fuel is used and the efficiency ... or just load the engine and measure it. You can also work it out by comparing angular acceleration with rpm.
 
You can't really calculate it. 304hp at 2500rpm is 638lbft. But there's no real way of saying what that will be at 1600rpm.
 
Agreed - you can model it and calculate what the model says but you can't say how well the model fits the actual engine you are using. In these situations it is usually easier just to measure it.
 
thank you for your helpfull answers...
 

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