NEW SPLIT-CYCLE ENGINE DESIGN TO IMPROVE FUEL ECONOMY BY 50 PERCENT

NEW SPLIT-CYCLE ENGINE DESIGN TO IMPROVE
FUEL ECONOMY BY 50 PERCENT :
Split cycle engines—engines that split the functions of
a normal four-cycle piston into two separate but
adjacent and complementary pistons—have never
been able to match the efficiency and overall function
of traditional internal combustion engines, but a new
design could change all that. By tweaking the
standard split-cycle design with new features like a
compressed air tank that captures wasted energy
from the system, the Scuderi Group claim not only to
have matched the efficiency of the standard four-
cycle engine, but to have far surpassed it.
The Scuderi Group’s design has drawn interest from
nine major carmakers, the company says, but has
yet to prove the technology in real world prototype
tests. But in computer simulations that install a
Scuderi engine in a 2004 Chevy Cavalier, the split-
cycle engine shows to reduce fuel consumption by 25
to 36 percent, translating roughly to a 50 percent
improvement in overall fuel economy. :
Split cycle engines—engines that split the functions of
a normal four-cycle piston into two separate but
adjacent and complementary pistons—have never
been able to match the efficiency and overall function
of traditional internal combustion engines, but a new
design could change all that. By tweaking the
standard split-cycle design with new features like a
compressed air tank that captures wasted energy
from the system, the Scuderi Group claim not only to
have matched the efficiency of the standard four-
cycle engine, but to have far surpassed it.
The Scuderi Group’s design has drawn interest from
nine major carmakers, the company says, but has
yet to prove the technology in real world prototype
tests. But in computer simulations that install a
Scuderi engine in a 2004 Chevy Cavalier, the split-
cycle engine shows to reduce fuel consumption by 25
to 36 percent, translating roughly to a 50 percent
improvement in overall fuel economy.

Regenerative Brake

Technically, you could generate energy by burning
brake pads, but automotive engineers have managed
to come up with a way to use brakes to generate
energy without going up in flames. The technology is
called regenerative braking. At the most basic level,
regenerative braking means re-capturing the kinetic
energy of the vehicle's motion and turning it into
another type of energy. Commonly, this is done by
converting kinetic energy into electricity and
recharging the car's battery with it.

DIFFERENCE BETWEEN A TURBO CHARGER AND A SUPER CHARGER

DIFFERENCE BETWEEN A TURBO CHARGER AND A
SUPER CHARGER
Both turbochargers and superchargers are called
forced induction systems. They compress the air
flowing into the engine. The advantage of
compressing the air is that it lets the engine stuff
more air into a cylinder. More air means that more
fuel can be stuffed in, too, so you get more power
from each explosion in each cylinder. A turbo/
supercharged engine produces more power overall
than the same engine without the charging.
The typical boost provided by either a turbocharger or
a supercharger is 6 to 8 pounds per square inch (psi).
Since normal atmospheric pressure is 14.7 psi at sea
level, you can see that you are getting about 50-
percent more air into the engine. Therefore, you
would expect to get 50-percent more power. It's not
perfectly efficient, though, so you might get a 30-
percent to 40-percent improvement instead.
The key difference between a turbocharger and a
supercharger is its power supply. Something has to
supply the power to run the air compressor. In a
supercharger, there is a belt that connects directly to
the engine. It gets its power the same way that the
water pump or alternator does. A turbocharger, on the
other hand, gets its power from the exhaust stream.
The exhaust runs through a turbine, which in turn
spins the compressor.

Biomimicry

Biomimicry Creates New Tires-
Biomimicry is the science that imitates nature to
create new products.
Resilient Technologies, a Wisconsin based company,
has created a tire that can't go flat.
Instead of using a pressurized aircavity, the tire
design relies on a geometric pattern of six-sided
cells that are arranged in a matrixlike a honeycomb.
It has the same ride, reduced noise levels and heat
generation as pressurized tires. The goal wasto
create an airless tire with uniform flexibility and load
transfer that would endure tremendous wear and tear
and still perform well.
The best design was found in nature, which was the
honeycomb.

2 & 4 Stroke engine Difference

2 & 4 Stroke engine Difference:
In case of two stroke engine, rotation of crank shaft
will be power stroke for every one rotation. During
compression stroke, fuel will flow towards the crank
case(suction) and during power stroke, exhaust will
emit the burnt fuel through the transfer ports.

Important Portals & their Founders

Some Important Portals & their Founders
1. Google — Larry Page & Sergey Brin
2. Facebook— Mark Zuckerberg
3. Yahoo— David Filo & Jerry Yang
4. Twitter— Jack Dorsey & Dick Costolo
5. Internet— Tim Berners Lee
6. Linkdin— Reid Hoffman, Allen Blue& Koonstantin
Guericke
7. Email— Shiva Ayyadurai
8. Gtalk— Richard Wah kan
9. Whats app — Laurel Kirtz
10. Hotmail— Sabeer Bhatia
11. Orkut— Buyukkokten
12. Wikipedia— Jimmy Wales
13. You tube— Steve Chen, Chad Hurley &
JawedKarim
14. Rediffmail— Ajit Balakrishnan
15. Nimbuzz— Martin Smink & Evert Jaap Lugt
16. Myspace— Chris Dewolfe & Tom Anderson
17. Ibibo — Ashish Kashyap
18. OLX— Alec Oxenford & Fabrice Grinda
19. Skype— Niklas Zennstrom,Janus Friis & Reid
Hoffman
20. Opera— Jon Stephenson von Tetzchner & Geir
lvarsoy
21. Mozilla Firefox— Dave Hyatt & Blake Ross
22. Blogger— Evan Willam Belli

Drive shaft

Drive shaft:-
A drive shaft, driveshaft, driving shaft, propeller shaft
(prop shaft), or Cardan shaft is a mechanical
component for transmitting torque and rotation,
usually used to connect other components of a drive
train that cannot be connected directly because of
distance or the need to allow for relative movement
between them.
Drive shafts are carriers of torque: they are subject
to torsion and shear stress, equivalent to the
difference between the input torque and the load.
They must therefore be strong enough to bear the
stress, whilst avoiding too much additional weight as
that would in turn increase their inertia.

supercharger

A supercharger is an engine-driven air pump that
supplies more than the normal amount of air into the
intake manifold and boosts engine torque and power.
It provides an instantaneous increase in power
without delay or lag associated with turbochargers.
Because it is driven by the engine, it requires
horsepower to operate and is not as efficient as a
turbocharger.
In basic concept, a supercharger is an air pump
mechanically driven by the engine itself. Gears,
shafts, chains, or belts from the crankshaft can be
used to turn the pump. This means that the air pump
or supercharger pumps air in direct relation to engine
speed.
types of supercharger
................................
-Roots-type supercharger :-
Named for Philander and Francis Roots, two brothers
from Connersville, Indiana, who patented the design
in 1860 as a type of water pump to be used in mines.
Later used to move air, and used today on two-
stroke cycle Detroit diesel and other supercharged
engines.
The roots-type supercharger is a positive
displacement design. All
air entering is forced through the unit.
-Centrifugal supercharger :-
Mechanically driven by the engine, similar to a
turbocharger but mechanically driven by the engine.
A centrifugal supercharger is not a positive
displacement pump and all of the air that enters is not
forced through the unit. Air enters a centrifugal
supercharger housing in the center and exits at the
outer edges of the compressor wheels at a much
higher speed due to centrifugal force.
Blade speed must be higher than engine speed so a
smaller pulley is used on the supercharger and the
crankshaft overdrives the impeller through an internal
gear box, achieving about seven times the speed of
the engine.
Examples of centrifugal superchargers include
Vortech and Paxton
Supercharger Service
Usually lubricated with synthetic engine oil inside the
unit, the supercharger oil level should be checked and
replaced as specified by the vehicle or supercharger
manufacturer. The drive belt should also be inspected
and replaced as necessary.

difference between Moment and Couple

What is the difference between Moment and Couple?
• Moment of force is the measure of turning effect of
a force about a point. A couple consists of two equal
and opposite forces acting with two different but
parallel lines of action. Each force has its own
moment.
• Moment of a force is dependent on the distance
from the pivot and the magnitude of the force while
the moment of a couple is the net effect of the two
moments of the forces. Moment of a couple is
independent of the location of the point considered. It
is constant throughout the plane. The resultant
moment of a couple is called a torque.
• Torque, also called moment or moment of force, is
the tendency of a force to rotate an object about an
axis, fulcrum, or pivot. Just as a force is a push or a
pull, a torque can be thought of as a twist.
Couple - Two equal but opposite forces
Torque - Moment of a couple

Carburetor used inAutomobiles

Automobile:
Which Carburetor used inAutomobiles?
A carburetor is a device used in petrol or similar
liquid fuel engines by means of which the fuel mixed
with air, is supplied into the induction manifold of the
engine. An engineering or automobile field connected
people will better know this. The main object of the
carburetor is to supply the required quantity of fuel
and air mixture of the correct strength as dedicated
by the load condition of the engine. For this purpose
different types of carburetorsare available in the
market. Out of that, you will find here the details of
Zenith Carburetor, as below. Zenith carburetor is also
known as “British Carburetor” and used by various
famous car manufacturers. This carburetor has also
number of designs available for different purposes.
Construction and Working
In this, float chamber is supplied with fuel from the
fuel tank through a pipe.Whenever the float chamber
falls short of fuel, the fuel from the fuel tank flows
into the chamber at a fastest speed than is consumed
by the engine with the result that, the float rises up, till
it reaches a certain level. At this time, a needle valve
moves down and rest against the seat, resulting the
stoppage of fuel supply from fuel tank.
The main jet is directly connected to the float
chamber while the auxiliary jet which is also called as
compensating jet draws fuel from auxiliary chamber
(Reservoir).Thi s auxiliary chamber is connected to
the float chamber through an orifice. Both, main and
auxiliary jet is openedup in the venturi.
The air to the carburetor is supplied through the
passage. The throttle valve is located at the end of
the carburetor and connected to the engine suction
pipe. The opening andthe closing of the throttle valve
controls the quantity of air-fuel mixture supplied to
the engine suction manifold. An auxiliary nozzle from
auxiliary chamber (Reservoir) is located at one end of
the by-pass and the other end of this nozzle, opens
upnear the throttle valve.
Working at Starting and Low Speed Running
Because of lower velocity of air at the time of starting
or slow speed of the engine, the suction produced at
the venturi is quite insufficient to operatethe main and
the auxiliary jet in nozzle. To improve the velocity of
air, the throttle valve is closed to such an extent that
there is only a small contracted passage is provided
near the end of by-pass. By this, the velocity of air,
passing through the region increases, producing the
high suction, which operates the nozzle at auxiliary
chamber and the air-fuel mixture supplied through
the holes.
There is starting and slow running device is fitted in
reservoir (Auxiliary Chamber).To vary the supply of
air to the nozzle, the set screw given is slackened
and whole assembly is taken out. By the suitable
number of rotation of screw joint, the position
ofauxiliary nozzle is set. The whole device is then
again fitted to the carburetor and tightened the screw.
Working at Normal Running
At this condition, the throttle valve is opened about
66% and as the air entering through the passage,
passes through the venturi, its velocity increases due
to smaller area consequently its pressure drops,
resulting the suction effect. The fuel is sprayed in the
venturi by main and auxiliary nozzle. As the speed of
engine increases, there by producing the greater
suction. Due to this, greater fuel being supplied by the
main nozzle. Since the compensating jet (Auxiliary
Jet) draws fuel from reservoir (Auxiliary Chamber),
which is subjected to atmospheric pressure, through
the air, the quantity of fuel supplied by it to the venturi
does not change to an appreciable extent. This has
the effect of supplying a weaker solution than if only
one jet were provide in which case, the air-fuel
mixture supplied at high speed will be richer then
desired.
Thus the compensating jet enables the air-fuel
mixture of the desirable strength to be supplied. In
fact with correctly proportioned design of various
parts of this carburetor, the fuel supplied by the main
and compensating nozzle can be made to bear
almost a constant ratio to the air supplied.