Different RPMs
-
Car A travels at 100km/hr at 6000 RPM.
Car B travels at 100km/hr at 5000 RPM.
Assuming that both cars are similiar(gearing ratios, etc..) except their engines. Am i right to say that Car B is more powerful? -
Imagine cars to be without gear ratios and all, and just a engine connected to wheels:
If both at travelling at 100km/h, assuming a same car shape, the air resistance/drag will be the same, and the power put into the car will be to overcome this resistance (newton's first law of inertia) to travel at const velocity.
But with gear ratios this complicate things up. Because If both of them are having the same gear ratio, and both are travelling at 100km/h, then the RPM must be the same because the distance moved per unit time is the same, hence the amount of rotation by the gears must be the same, and the gears being connected to the engine, and hence the engine must be rotating at the same speed. -
ah ok thanks for clearing that up.
-
the rpm at whichever speed is not a determinant for the power of the engine.Originally posted by l0st-s0ul:Car A travels at 100km/hr at 6000 RPM.
Car B travels at 100km/hr at 5000 RPM.
Assuming that both cars are similiar(gearing ratios, etc..) except their engines. Am i right to say that Car B is more powerful?
if 2 cars have the same gear ratios, their rpm will always be the same at 100 km/hr irregardless of what horsepower each of them has.
the term "power" is a measure of how much energy an engine produces per unit time. putting aside issues like gear ratios and weight of the vehicle, a more accurate determinant of which engine is more powerful would be how fast each car in question takes 2 reach 100 km/hr. this effectively tells u how much energy an engine is producing within the same given time frame 2 propel the car from rest. -
hmmm...
can i put it this way
"car B can go up to a higher speed limit compared to car A"? -
This is true only if they also have the same rolling circumference.Originally posted by tailslide:if 2 cars have the same gear ratios, their rpm will always be the same at 100 km/hr irregardless of what horsepower each of them has. -
if use bigger wheels then though same rpm. the one wif the bigger wheel will move faster????
-
no...bigger wheels means that the car have to travel more distance to cover one full distance of the tyre or something lyke tat....Originally posted by heluim:if use bigger wheels then though same rpm. the one wif the bigger wheel will move faster????