The RPM

                                  I am very interested in motorvehicles and all that kind stuff. I am confused a little bit about a thing that is THE RPM i am not able to to understand how this RPM sometimes fall and grows up when i was little small then i thought that the RPM should increase with the increase in speed every time and lowers when the speed deaccelerates. But after a shorter span i saw a many brochures of car manufacturers where it was written like "290 pound feel of torque just as before but maximum torque now kicks in sooner at 4000rpm(2008 edition of Subaru WRX STI )" in this case i am still thinking that how the maximum torque kicks sooner at 4000rpm it will be more at little more rpm because the formulae for torque is (force * force arm) then if the speed is increased the force on the wheel is also increased which increase the torque respectively. I also saw some cars having same top speeds but different RPM is it because of their different wheel sizes or if the wheel sizes should be same the RPM produced by both the vehicles will be same at same speed. My thinking says that two vehicles of same tyre size should produce same RPM at same speed.

                  Once while travelling from Jammu City to Udhampur City I was siiting in the cabin of the bus and inspecting the RPM meter with the other meters whole journey, when the Bus was in his 2nd gear and start accelerating quikcly the RPM was also increasing directly proportionally to the speedo meter to 2500rpm but when the speed reached 40km/hr and the driver changed the gear to 3rd the speed get less than 40km/hr but greater than 35km/hr That is only 5km (approx.) speed get reduced but the Rpm meter goes down to 1200rm from 2500rpm with the decrease of only five km of speed in this case the RPM meter is not directly proportional to the speedo meter so my suggestion may be wrong. If any body has an idea about this topic please comment on it or give the answer for me and the blog readers. 

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