I understand that it drops off in the high end because air can’t get into the cylinder fast enough, but what limits are there at low RPMs? Why does an explosion at say 1000 RPM not produce the same torque as one occuring at 3000-4000? And is it the same reason in both gasoline and diesel?
In: Engineering
Engine seals aren’t that perfect. Gas can escape, given time.
Engines are also tuned for specific RPM’s. They’re most powerful/efficient at these RPM’s. This RPM is usually pretty low, since engines spend most of their time at low rev. However, at *even lower* revs, they go beyond the range they’re tuned for. By changing timings and such, this can be partially worked around, but things like exhaust geometry don’t really change easily.
There are probably other reasons that I don’t know about, too.
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