What is the difference between 20bhp @ 4000 RPM vs 20bhp @ 8000 RPM?
BHP is brake horse power i.e. the power generated at the crankshaft of the engine. Now in these both cases there is 20bhp. So we are assuming that these are two different engines with different configurations.
So in first case, engine generates 20bhp net power while running at 4000 RPM. On the other hand, in second case, engine generates 20bhp net power while running at 8000 RPM.
In engines, we study a power-torque curve to check performance of engine. Now from this P-T curve, you will find that power of any engine increases with increasing in RPM for some range of RPM. There comes a point of RPM where this power produced by an engines gets maximum and after this point the power generation decreases with increase in RPM.
So in these cases the power that has mentioned is the pick power an engine can produce during that particular RPM. When we look at any car's or vehicle's brochure, you will find this explanation in power category. But remember the power that the company has mentioned is max power, which you will hardly get at those high RPM. Vehicles don't run at those high RPM constantly.
Now in these cases, for engine 1 the value of RPM is low(4000 RPM) and still generating 20bhp, so that means you will get more value of torque compared to engine 2 which has 8000 RPM. As we all know torque is inversely proportional to RPM, more RPM than less torque and vice versa.
So in first case, engine generates 20bhp net power while running at 4000 RPM. On the other hand, in second case, engine generates 20bhp net power while running at 8000 RPM.
In engines, we study a power-torque curve to check performance of engine. Now from this P-T curve, you will find that power of any engine increases with increasing in RPM for some range of RPM. There comes a point of RPM where this power produced by an engines gets maximum and after this point the power generation decreases with increase in RPM.
So in these cases the power that has mentioned is the pick power an engine can produce during that particular RPM. When we look at any car's or vehicle's brochure, you will find this explanation in power category. But remember the power that the company has mentioned is max power, which you will hardly get at those high RPM. Vehicles don't run at those high RPM constantly.
Now in these cases, for engine 1 the value of RPM is low(4000 RPM) and still generating 20bhp, so that means you will get more value of torque compared to engine 2 which has 8000 RPM. As we all know torque is inversely proportional to RPM, more RPM than less torque and vice versa.
Thanx
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