Tyre Threading   One of the most important parts of an automobile is the wheel and tyre. The importance of wheels and tyres in the automobile is obvious. Without the engine the car may be towed, but even that is not possible without the wheels and tyres. The wheel along with the tyre has to take the vehicle load, provide a cushioning effect and cope with the steering control. A tyre is a cushion provided with an automobile wheel. It consists of mainly the outer tyre and the inner tube. The air inside the tube carries the entire load and provides the cushion. The functions of a tyre are 1. To support the vehicle load 2. To provide cushion against shocks 3. To transmit driving and braking forces on the road 4. To provide cornering power for smooth steering The thread design is one major factor aspect of tyre design. It determines the terrain adaptability of the tyre. The safety of the vehicle and the occupants depend a lot on the health of the tyre and its design In conventional petrol engines, when the accelerator pedal is pressed, the throttle butterfly opens to allow fresh air to come in. The fuel injection system measures the mass of air entering and injects the required amount of fuel