Why is it so difficult to get high torque values out of a 4 cylinder engine? Can't we keep increasing the boost assuming that fuel quality is not a problem?
A piston's acceleration does not follow a sinusoidal waveform. Plotting instantaneous torque with mean torque vs crank angle rotation, a 4 stroke, 4 cylinder engine would typically experience almost 4 times more than mean torque values at peak and almost 2 times below of mean torque through each cycle of rotation. On a dyno this is averaged out. On the other hand an even-fire V8 or V12 would go through lower extremes through its own cycle.
This is why I believe it will not be easy to get "torque monsters" out of 4 stroke, 4 cylinder engines as compared to V8s and V12s with similar swept displacements. It ultimately comes down to engine design and materials.
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