Posted tagged ‘bus’


September 10, 2011

The working of an automobile engine follows the same principle as an internal combustion engine. Air, from outside, enters the engine through the air cleaner and reaches the throttle plate.
The pedal in your car is the control for the amount of air that you would want to be taken in, and you control it by pressing on this gas pedal.
The air is then distributed through the intake manifold of the cylinders.

At some point fuel is injected into the air stream, and the mixture vaporizes and is drawn into the cylinders as they start their intake stroke.

This way, when the cylinder has reached its bottom, it has drawn in sufficient mixture. As it moves up, compressing the mixture, the spark plug ignites the mixture, and as the powerful gas formed expands, it pushes the cylinder to the bottom with the cylinder once again drawing in the mixture.

In designing automobile engines, you need to be a specialist in automobile engineering.
The consideration that is taken while designing such an engine is whether it should be a carburetor or a diesel one. carburetor engines are most commonly found in passenger cars and low capacity trucks, while trucks with a capacity over two tons are fitted with diesel engines, including dump trucks, trailer tractors and bus.

Increasingly the medium and low-capacity vehicles are being fitted with diesel engines, since the fuel consumption of these engines are 30% to 50% lower than the carburetor engines.
Diesel engines not only cost more, but maintenance is much more expensive than the other type of engine. Diesels require more metal parts per kilowatt.
The critical parts of diesel engines are made of alloy steel, and the fuel injection system is much more expensive than carburetor engines.

However, the cost of manufacturing carburetor engines has increased with the use of higher mechanical grade components, considering the thermal loads of the material used. At the same time the use of high alloys and increase in production costs have contributed to the higher price of such engines.

There is a sharp rise in using aluminum alloys in design of carburetor engines in passenger cars, and with the use of high octane petrol, the cost of operation of these cars have come down extensively. Using alloy steel in constructing the engine body and other parts of the engine, makes the car lighter and hence fuel consumption goes down substantially.

The main parts that are made of high steel alloy are the main casting of the engine, the cylinder head, water and oil pumps, oil filter housing, end covers of the generator and starter, and the intake pipes. It has been observed that by using high steel alloys, the weight of the car is reduced by 35%.

The power per liter, per unit of piston area, and the brake effective pressure are 6% to 8% lower in air-cooled engines, compared to engines having liquid cooling mechanism. This is due to the fact that in engines with liquid cooling there are great losses in cylinder charging caused by the high temperature in pipes, ducts in the head, cylinder walls and head, etc.

The size of air cooled engines are much bigger than the engines with liquid cooling having the same capacity, and this is because the cylinder axes difference is larger in air-cooled engines. Taking account of the radiator dimensions, if both engines are compared, the air-cooled engine will vary slightly with its height a little longer than or approximately the same length as the water-cooled engine. As far as the width and the height is concerned both engines are about the same.

The auxiliary units of the feed and ignition, and generator and starter systems are a bit difficult to fit on the body of the air-cooled engines, because of the presence of hoods and having a danger of over-heating.

Some posts need no Title-2

August 23, 2011

I comforted myself at the back of 50 seater with my crew…!!

All took their ID cards out and got ready with complete formals except few guys like me …
I took Rajeev’s shirt..
for the fact i dint picked even a single formal dress for the tour…!!
It took almost 40 odd minutes to reach the CMTI from the rail station..
those 40 odd minutes had given us little glimpse of bustling metro life..!
The wallposters of kannadaWOOD(Don’t know what to call!!)
I don’t know why they got my attention…
those actresses are the people who tried their luck at tollywood and failed…!!
I saw My childhood Fav star Nikhita in “GUN” wall poster..!!
And the most amazing thing is there are some people Called HEROES looked like the fellows who were denied admission in Mysore ZOO..!!
There i saw “5 Idiots”
Something that looked like” Kalamanja”(I really dont know how to pronounce Kannada words…!!)
I felt so sorry for the audience of mighty Bengaluru Metro People..!!
When compared to those stars even OM (Okka Ma…..) is lil better…!!
Suddenly the bus stopped at a junction huge traffic…!!
A huge construction under progress….
We don’t know that it was a part of B’lore Metro..!!
There is a huge iron pillar..
something like huge plate was attached to it…
We had a heated argument about whether the plate is riveted or bolted…!!
Then came a guy known for his photography with his brand new canon Mr.Mahendra Pedapati photographed that thing and zoomed that picture and showed that it was riveted..!!
i own my stake of Rs.10/- with Kesh..!!
Few minutes later we reached CMTI @ CVRamanNagar..
The lunch was already arranged there for us…
I expected lot from the kannada people…
But i just had to adjust myslef with Chapathi, 2 cups rice….
Sambar and the curd (Sour..!!)….
all for just Rs.50/-
Started into industry …!!
They just don’t allow Cameras or phones into industry…!!
Immediately after security check we were all allowed into that esteemed ,serene campus..!!
We were divided into 2 groups and set sailed for the next 3 hours..!!
The group which consisted me rushed into Rapid prototyping block ,Where a guy called Vinod waiting for us ..!!
He explained What prototyping is
and why it is being used and alll…..
It is the only process where we can produce a sphere inside another sphere freely rotating and without seam that in single step…!!
The process is supported by A slicing software and a machine which manufactures…
Somebody told us to note down the specifications of that machine….
I wonder what we do with them…??!!