Hello Forum members I make a JRC about diesel engines and their operation. However, it is not yet quite clear to me how the torque curve or the course of the torque comes to the edge. My assumption is that in the optimal case the torque would have to remain the same over the whole speed range.Various factors influence this, which is why a low torque lies in the lower speed range, rises to the optimum point and falls again. Factors ( which I’m still looking for ) [b]minimize in order to achieve a flat torque curve as flat as possible. Is that so far? My conjectures: Falling torque in the upper speed range: Due to vortices in the cylinder, not the whole burnt mixture escapes during the blast and is still in the combustion chamber when the ignition is nearer. The burned mixture cannot produce torque. The fuel cannot distribute quickly enough in the combustion chamber, therefore there is no need for the combustion chamber. The time of the explosion is wrong, because it is not possible to move it as far forward (time) as possible. Otherwise there would be misignition, over the piston over the dead point (at the very top) would be. Thus, there is a lower torque and a limitation of the highest speed. The cylinder we are at some point exposed to too high loads due to the rapid change of the direction of motion. Limitation of the speed upwards. (but why can we do this?) This is true? What is there still falling torque in the low speed range The hardening of air and fuel is not right. Too little air. No optimal combustion. (But with compressor engines this does not look much better than with or without turbocharger) Which factors still play a role? which were all wrong? Somehow opening times of the valves, gas changes. What do the manufacturers do about the torque curve to o ptimieren? I know a lot of questions that I have there. But I also tried to formulate my questions intelligibly. I would be pleased with many answers.