Dont think it has to do with size, a v8 can be made to go xxx rpm just as well. Were talking competition seeking peak performance within a set limit type of motor, type of race, type of vehicle which is a reflection of audiences preferences. Both are design for peak performance, accelleration vs wot endurance fuel consumption. Theres tons of restrictions placed on f1/v8 or any type racing, rules placed to increase competitiveness, safety and speed.
So, regarding torque and hp i give up, way too complicated but those 3cc rc trucks do 60 quick and a 50cc 1hp moped does 19 slow. Sounds just about right considering size n weight.