CHOKE IN MOTORBIKES EXPLAINED !!

Choke valve in bikes :-

A choke valve is sometimes installed in the carburetor of internal combustion engines. Its purpose is to restrict the flow of air, thereby enriching the fuel-air mixture while starting the engine. Depending on engine design and application, the valve can be activated manually by the operator of the engine (via a lever or pull handle) or automatically by a temperature-sensitive mechanism called an autochoke.

Why it is important?

Choke valves are important for naturally aspirated gasoline engines because small droplets of gasoline do not evaporate well within a cold engine. By restricting the flow of air into the throat of the carburetor, the choke valve reduces the pressure inside the throat, which causes a proportionally greater amount of fuel to be pushed from the main jet into the combustion chamber during cold-running operation. Once the engine is warm (from combustion), opening the choke valve restores the carburetor to normal operation, supplying fuel and air in the correct stoichiometric ratio for clean, efficient combustion.

5 INTERESTING FACTS RELATED TO MECHANICAL ENGINEERING THAT BLOWS YOUR MIND

1. A Indian King took revenge on Rolls-Royce by using their cars to transport city's waste.

One day during his visit to London, King Jai Singh was walking in casual dress in Bond Street. He saw a Rolls Royce showroom and went inside to inquire about the Price and Features etc of their cars. Considering him a just another Poor Indian citizen, showroom salesmen insulted him and almost showed him the way out of the showroom. After this insult, King Jai Singh came back to his Hotel room and asked his servants to call the showroom that King of Alwar city is interested in purchasing their few Cars. After few hours King reached the Rolls Royce showroom again but with his full astonishing royal manner and in his royal costume. Until he reached the showroom there was already red carpet on the floor and all the salesmen were bent with respect. The King purchased all the six cars that they had at showroom at that time and paid full amount with delivery costs. After reaching India, King ordered municipal department to use all those six Rolls Royce cars for cleaning and transporting city’s waste. World’s number one Rolls Royce cars were being used for transportation of City’s waste, the news spread all over the world rapidly and the reputation of Rolls Royce Company was in drains. Whenever someone used to boast in Europe or America that he owned a Rolls Royce, people used to laugh saying, “which one? The same that is used in India for carrying the waste of the City?” Due to such reputation damages, sales of Rolls Royce dropped rapidly and revenue of company owners started falling down. Then they sent a Telegram to the king in India for apologies and requested to stop transportation of waste in Rolls Royce cars. Not only this but they also offered Six new cars to king free of cost. When King Jai Singh observed that Rolls Royce has learnt a lesson and they are sorry for their mistakes, king stopped using those cars for carrying wastes. 


2.The “Traub,” the rarest motorcycle in the world

The “Traub,” the rarest motorcycle in the world, was found behind a brick wall in Chicago in 1968, and still runs to this day.

An examination from Dale Walksler, the current owner, reveals it can be dated back to 1916. The engine’s technology was well ahead of its time, and even some mechanisms on it had never used on any other American motorcycle.

3.Hitler designed the prototype of Beetle design for Volkswagen

Sitting at a restaurant table in Munich in the summer of 1932, Hitler designed the prototype for what would become the immensely successful Beetle design for Volkswagen (literally, the "car of the people"). In an era where only the most economic elite possessed cars, Hitler believed that all people should be able to own a car and additionally thought that a smart design could allow for reliability, enjoyment, and vacation travel. The name given to the car in 1938 was Kraft durch Freude (KdF-Wagen, literally "strength through joy car"

4.The first car accident

The first car accident occurred in 1891, in Ohio.

5.The Four Rings in the AUDI Logo represent the FOUR companies of  AUTO UNION

By 1932, the name fiasco between Horch the man, and Horch the company was water under the bridge. Horch (the company) and Audi entered an agreement along with two other German car manufacturers, DKW and Wanderer, to form Auto Union. The four rings, which Audi still uses today, originally represented the four companies of Auto Union.

COMMON RAIL DIRECT INJECTION (CRDi) EXPLAINED !!

CRDI (Common Rail Direct Injection):-

CRDi stands for Common Rail Direct Injection meaning, direct injection of the fuel into the cylinders of a diesel engine via a single, common line, called the common rail which is connected to all the fuel injectors.

Whereas ordinary diesel direct fuel-injection systems have to build up pressure new for each and every injection cycle, the new common rail (line) engines maintain constant pressure regardless of the injection sequence.Same pressure of fuel is injected in each cylinder.

Advantages & Disadvantages :

Advantages:-

CRDi engines are advantageous in many ways. Cars fitted with this new engine technology are believed to deliver 25% more power and torque than the normal direct injection engine. It also offers superior pick up, lower levels of noise and vibration, higher mileage, lower emissions, lower fuel consumption, and improved performance.

In India, diesel is cheaper than petrol and this fact adds to the credibility of the common rail direct injection system.

Disadvantages:-

Like all good things have a negative side, this engine also have few disadvantages. The key disadvantage of the CRDi engine is that it is costly than the conventional engine. The list also includes high degree of engine maintenance and costly spare parts. Also this technology can’t be employed to ordinary engines.