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4

The engine torque produced is a function of the amount of air ingested and the air/fuel ratio combusted in the cylinder(s), combined with 'static' variables like the compression ratio, bore/stroke, crankshaft design, intake length, cam profile, intake and exhaust sizing, etc. With all the other parameters now static (non-variable) once the engine is built ...


3

horsepower = (torque * RPM) / 5252 always. Typically engines have to suck in their air and fuel so they can only suck in an optimal amount in a certain range. With a turbo you are forcing the air in, so the engine can make more torque over a wider range. If there is a max torque the manufacturer wants to set (for torque limit on the ...


2

That's not a realistic flat-torque graph. It should look more like the following in the real world: Although you woold find that the horsepower v torque holds true if you apply the calculation at any point on the RPM band.


2

Your engine was designed in such a way that it is most efficient between 3500RPM and 5000RPM. That means that the valve timing and camshaft profiles were made in such a way that your engine "breathes" best between those speeds. That's why you have the most torque in that region. Another thing is that as the RPM increases, it gets harder and harder to get the ...


2

There are various reasons as to why an engine is not efficient beyond its tuned range. Laws of thermodynamics, I do not want to get into scientific details but it simply means that you cannot transfer heat and convert it into energy efficiently beyond a certain point where the ambient temperature and cylinder pressure start to make more impact. Geometry of ...



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