Wednesday, December 9, 2009
Songs..
How can life be what you want to see
You're frozen
When your heart's not open
You're so consumed with how much you get
You waste your time with hate and regret
You're broken
When your heart's not open
Now there's no pain in placing the blame
And you should know I suffer the same
If I lose you
My heart will broken
Love is bird,she needs to fly
Let all the hurt inside of you die
You're frozen
When you heart's not open
If I could melt your heart
We'd never be apart
give yourself to me
you hold the key.....
You're frozen
When your heart's not open!
Monday, March 16, 2009
How to reset your phone's wallet code
*#7370925598# and enter security code
Saturday, February 21, 2009
How to set your mobile Life-timer zero(only Nokia)
Saturday, February 14, 2009
Tuesday, February 10, 2009
Cam less I.C. Engine
Most piston engines today employ a camshaft to operate poppet valves. This normally consists of one or more shafts parallel to the crankshaft with a number of oblong lobes or cams protruding from it, one for each valve. The cams force the valves open either by pressing directly on the valve stem, or by operating some intermediate mechanism. (Exceptions to this system include the two-stroke and Wankel engines, which use piston-controlled ports).
Sliding friction between the surface of the cam and the cam follower reduce the ultimate power of the engine. While attempts have been made to combat this with rollers (which also permit the use of concave cam lobes), there are more frictional losses in the tappet blocks and valve guides. Then there are the losses in hysteresis, whereby not all of the energy used to compress the valve springs is returned as the spring extends again. All these reduce the overall efficiency of the engine. And, of course, camshaft/spring operation introduces valvetrain weight, limiting the rotational speed at which the engine can operate.
One of the approaches designed to overcome these problems, but which has proved difficult to implement, is Camless valvetrains using solenoids or magnetic systems which have long been investigated by BMW and Fiat, and are currently being prototyped by Valeo and Ricardo. The new Fiat Nuova 500 is supposed to have this kind of engine[1].
The earliest proposed system was on the Tucker Torpedo in 1947, which was planned use oil pressure to open the valves. However, the engine didn't reach production due to legal problems.
Camless engines would not only be more efficient in terms of mechanical energy, they would also be more flexible, as the valves could be computer-controlled and free up more power to the wheels. Infinitely variable valve timing would be possible, though variable valve lift would be more difficult. Valeo estimates that the efficiency of a camless engine would be 20% greater than a comparable camshaft-operated engine, though Ricardo is more conservative. These companies are positioning this technology as an alternative to hybrid engines currently used to increase fuel economy.
Green Engine.......
The Wankel engine is a type of internal combustion engine which uses a rotary design to convert pressure into a rotating motion instead of using reciprocating pistons. Its four-stroke cycle is generally generated in a space between the inside of an oval-like epitrochoid-shaped housing and a roughly triangular rotor. This design delivers smooth high-rpm power from a compact, lightweight engine. Since its introduction the engine has been commonly referred to as the rotary engine, though this name is also applied to several completely different designs.
The engine was invented by engineer Felix Wankel. He began its development in the early 1950s at NSU Motorenwerke AG (NSU) before completing a working, running prototype in 1957. NSU then subsequently licenced the concept to other companies across the globe, who added more efforts and improvements in the 1950s and 1960s.
Because of their compact, lightweight design, Wankel rotary engines have been installed in a variety of vehicles and devices such as automobiles including racing cars, along with aircraft, go-karts, personal water craft, chain saws, and auxiliary power units. The most extensive automotive use of the Wankel engine has been by the Japanese company Mazda.
Sunday, February 8, 2009
about sunday
ya..........this is big yawn at 10:30 a.m.
My friend is said it is earlier so again you please sleep and have a sweet dream.
but I WANT TO ADD BLOG SO I WAKE UP.