CHECK OUT WHY NEW TYRES HAVE RUBBER HAIR ON THEM !!

There are little rubber hairs that you see on every new tire. Technically, they are called vent spews, which gives away their purpose for being on the tire. Many people think these hairs play a role in noise reduction or indicate wear but their primary purpose is air ventilation.

Those little rubber hairs are a byproduct of tire manufacturing. In a tire mold, rubber is injected and air pressure is used to force the liquid rubber into all the nooks and crannies. In order for the rubber to completely fill the mold, small pockets of air need to be able to escape.

There are small vent holes in the mold so trapped air can find a way out. When the air pressure forces the liquid rubber into all the orifices, a tiny bit of rubber makes its way out of the vent holes as well. These rubber bits firm up and remain attached to the tire when it's removed from the tire mold.

Though they serve no purpose in your tire’s performance, the tire hairs' presence is an indication that a tire is new. Tires that have been in service for some time, coupled with environmental effects, will eventually wear off the hairs.

CHECK OUT WHY HATCHBACKS HAVE REAR WINDOW WIPER BUT SEDANS DON'T !!!

Rear wipers are essentially meant for vehicles with an upright rear window that collects dust, dirt, snow, etc., because of aerodynamics – the flow of air over the right angle where the roof and rear window meet creates a low pressure area that pulls that nasty stuff in and deposits it onto the surface. 

Sedans, with their sloped roofline rely on that same flow of air – this time over the roof and down the window to keep it clean. Adding a wiper would create more aerodynamic drag creating slightly more fuel use. A wiper also requires an electric motor and a fairly convoluted mechanism and lengthy arm to make the wiper sweep across the glass from side to side. 

SUVs/hatchbacks with window right at the rear has nearly vertical windows, but not the trunk to guide the airflow. It has a low-pressure zone right in that area when it's moving at speed, which will "suck in" water and dirt and thus make the window very dirty.

This is totally based on the concept of aerodynamics !!

ELECTRONIC FUEL INJECTION (EFI) EXPLAINED !!

For an engine needs to work it requires energy from fuel, whether it may be petrol, diesel or any other alternative fuels. Electronic fuel injection is a kind of fuel delivery system or feeding of fuel to the engine in a electronically controlled environment.

It is similar to a computerized delivery of fuel supply to the engine. A computer here in the sense is a small micro controller (a microprocessor and a control unit).

Microcontroller is a  hardware device which is controlled by a microprocessor. This setup is similar to a washing machine where a user sets a washing program and the entire wash cycle takes place automatically as per the predefined program.

An electronic fuel injection is similar to the washing machine but here it delivers the fuel into the engine as per the engine requirement Many may raise a question why we use an electronic fuel injection rather than using a conventional system like carburetor (petrol engines) or fuel pump with injectors (in diesel engines).

Conventional systems which we are using so far can be suitable only for ideal conditions. A carburettor or a fuel injection pump works only according to an appropriate setting for delivering fuel correctly. This setting is a fixed and it cannot adapt itself to the outside weather and environmental conditions and many other factors.

One best example is starting a bike or car in cold weather is a hard job, A carburetor fitted bike cannot start easily and manually we use choke to induce more fuel into the engine for getting started. The cars without EFI system use heater plugs to warm up the engine before getting started.

A bike equipped with fuel injection system do not get this problem. The electronic fuel injection system gathers all the details from sensors of outside world such as weather, environmental conditions which includes engine temperature, atmospheric pressure, air intake temperature etc.

The microprocessor is already programmed with some predefined set of  algorithms and all the above factors are monitored constantly. So the system predicts how much fuel and air has to be delivered into the engine for a given condition to get optimum performance and efficiency. The microprocessor takes care and controls the fuel delivery here. So when the engine gets cold or the atmospheric pressure is low (in mountains) the microprocessor senses it and delivers the fuel according to it.

During high speeds the conventional systems lacks efficiency. For example riding sane at economical speed delivers good mileage of 45-50 kmpl for Honda Unicorn and while riding at 90km/hr returns only a max of 35 kmpl.

A bike equipped with fuel injection system provides hassle free rides with a constant mileage, No starting problem, better mileage and good acceleration (pick-up) and performance remains unchanged whether you are driving in mountains or  hot plains, more power output, no tuning for most modifications, smoother running, doesn't require a manually operated "choke" and very emissions friendly. It also prevents knocking and pre ignition.

Honda patents its electronic fuel injection system as PGM-fi (programmed fuel injection).

Fuel Injection Cons:

• Requires more wiring, fuel line, and parts.
• Needs expert supervision to configure it. An ordinary mechanic cannot fix it.
• Requires a fuel pump.
• More expensive.