Hi, I need some help concerning the Carnot cycle [i've searched, but what i needed didn't come up]. I am trying to work out the efficiency of a 4 or 2 stroke motorcyle engine. [car engine, it doesn't matter really]. But i'm having some difficulty finding temperatures for the hot and cold reservoirs. I've searched the internet for a while...but still can''t come up with anything. If anyone has any idea please help!!! Thanks.