Truthfully, there is no definitive answer as to which is more important. A more important consideration is understanding the balance between the two, how they interact or, perhaps, how to influence an engine by giving it more of one or the other. If you want to shred your car tyres , you need some low-down torque, but if you are after land-speed records, then horsepower will always win out. Not all engines are the same, as even two units pulled from the same line will differ on an engine dynamometer.
Even then, it would need to be a fully-controlled environment as the air pressure, temperature and humidity will all affect the power readings of an engine, even more so when we bring forced induction into the equation. It is possible to shape the characteristics of power: for example, a long stroke engine will generally give more torque than a short stroke engine.
On this same basis, we can play with the cam timing to affect the power delivery — advancing the cam timing should deliver more low-down torque, while retarding it equates to high RPM horsepower. Most modern engines strive for a balance of torque vs horsepower. Another element to consider is forced induction FI. Supercharging or turbocharging the engine is a great way to increase its power, usually in quite a cost-effective way.
Here, again, we have two routes, both offering different options. Supercharging, on one hand, will generally give you more engine torque, whereas a turbo will give you extra horsepower. Of course, we need to add a caveat. One further consideration when it comes to engine design, type and power is the choice of fuel. This relationship is becoming increasingly blurred as once diesel was considered to be truck fuel and petrol was for motor cars. It is no longer the case as diesel cars became almost as popular as petrol ones in the last years, making an enormous impact on the race track.
For instance, manufacturers such as Audi and Peugeot only entered diesel cars in the famous hour Le Mans motorsport race because the torque and fuel economy are ideally suited for endurance racing. Torque and BHP might get complicated for someone with no background in physics.
To mitigate that we will cover the basics of power and energy. Energy is the ability to do work. There are many forms in which energy can exist and it can never be created or destroyed. Unit of energy is defined as Joules. To give an idea of how energy works, take the example of walking to someplace.
Assume you have Joules and it takes 70 Joules to reach the place. Power is the rate of using energy. Take the same example discussed in energy.
You expend 70 Joules to reach your destination and now assume it takes you 10 seconds to reach there. This means you expended 7 Joules per second. A little out of the topic thing that we need to cover which will make understanding power and energy even easier.
When a force is free of any direction it is called a scalar quantity. Energy and power are both scalar quantities as they are independent of the direction they are applied to. Torque, on the other hand, is a vector quantity. Physics-wise torque is the force applied at a distance. Inside the engine, combustion is the force applied to the crankshaft at a distance through the connecting rod.
Horsepower, on the other hand, is the rate at which work is done. Also, horsepower is torque times rpm. To demonstrate the same, Fenske uses two cars that are of the same mass. A fast road tune engine far right sacrifices some fuel economy for increased power.
The amount of torque is overall slightly less, and the maximum torque occurs at higher revs. Such an engine develops more top-end power which would give a higher top speed, but its decreased overall torque requires higher revs for the same power output and more gearchanging — a less 'lazy' drive. The Video Course teaches you everything about modern cars. Engine Block 18 minutes. Every part explained There's ridiculous detail on every part. Clearly and easily explained.
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