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New Era Of Casting ZA-12 Graphicast

+1 demo: Basic page


Graphicast ZA-12 zinc alloy castings offer an excellent combination of mechanical properties, surface finish, and low cost. ZA-12′s strength, hardness, and wear properties are better than any other general-purpose nonferrous casting alloy. Because ZA-12 is spark proof, it can be used in hazardous environments, including those underground.Better material

ZA-12 vs. Cast Iron

ZA-12 has approximately the same density as cast iron, but is stronger. It machines three times faster with greatly improved tool life. It also offers much better corrosion resistance.

ZA-12 vs. Aluminum

ZA-12 is harder, stronger, and has better wearing qualities than aluminum, yet it does not require heat treating. ZA-12 machines more easily than aluminum, is more dimensionally stable, and will not warp.

ZA-12 vs. Brass/Bronze

ZA-12 machines as easily as either brass or bronze, yet has superior strength, hardness, and wearing qualities. It can also be coated for corrosive applications/environments.

With excellent castability, ZA-12 has a distinctive lustrous appearance, and its low casting temperature promotes long mold life. Zinc metal and alloys are also readily available at relatively stable prices, ensuring the long-term viability of products designed with Graphicast components.

New Technologies In Petrol Engine

Gasoline Engine Management Technology
A system for low fuel consumption, low emissions, and high torque

The Gasoline Engine Management System boosts
fuel efficiency by 18% overall, and complies with the
J-ULEV standard for ultra-low emissions vehicles set
forth by Japan’s Environment Ministry.

(i) UC Injectors

.Injectors that produce smaller droplets, precise fuel-
flow control, and a fine-tuned fuel/air mixture all work
together to limit hydrocarbon production when the car
is first turned on and is warming up. The UC injector
nozzles have a fan-shaped taper that produce
droplets with an average size of 50 microns, the
smallest in the world and a leap forward from the 65-
micron size that earlier nozzles produce.

(II) VCT Controller

The variable cam timing controller alters the timing of
the air-intake valve opening and closing, and works in
tandem with the internal EGR control valve to
minimize NOx production and raise fuel efficiency. It
works by continuously varying the phase of the intake

(iii)Super Ignition Spark Plug

By using a special alloy, both center and ground
electrodes, much smaller in diameter than
conventional, have improved ignitability and
achieved better fuel economy.


The engine control unit coordinates the operation of all
the various parts of the gasoline engine management
system using precisely tuned control algorithms that
result in maximum performance from the system.

(v)O2 Sensor & Air/Fuel Sensor

These work together to hold the air/fuel mixture at its
theoretical idea (14.6%) and minimize NOx production.
The O2 sensor makes a binary determination of whether
the mixture is lean or rich; the air/fuel sensor, much faster
acting than typical models, responsively takes
continuously variable readings of the mixture ratio.

(vi)Hexagonal Ceramic Substrate

a new hexagonal cell with
thinner walls, which gives quick warm up and low
pressure drop.

(vii)Transmission Fluid Warmer

The transmission fluid warmer shortens the warm-up
period for the automatic transmission and helps it
work more efficiently immediately after startup. Cold
transmission fluid is relatively viscous and is a cause
of poor fuel efficiency. The warmer reduces the
viscosity problem and contributes 1.5–2% to fuel

Its owned by “Denso”

Considering Mechanical Engineering?

The Expanding Role of Mechanical Engineers

Mechanical engineers build useful products for society. They design and manufacture everything from medical devices to jet engines, and they integrate computer chips into “smart products.” Mechanical engineers now reach far beyond the industries traditionally associated with the field, such as transportation and power generation. Mechanical engineers are creating new, important technologies that impact upon every aspect of our lives.

Designing for a Sustainable World

Recognizing that the environmental impact of the products we use has become a crucial design consideration, Stanford’s Mechanical Engineering department has made this an important focus. ME’s focus on sustainable design aligns with Stanford’s leadership position in promoting environmental sustainability – helping societies lean how to meet the demands for energy, food, water and other vital needs without undermining the planet’s precious resources.
Combining Excellence in Education with Service to Society

The goal of the undergraduate program in Mechanical Engineering is to provide students with a balance of intellectual and practical experiences that enable them to address a variety of societal needs.

Our program at the undergraduate level prepares students for entry-level work as mechanical engineers or for graduate study in engineering or in another discipline where a fundamental engineering background constitutes a desirable foundation.

With a solid grounding in the principles and practice of mechanical engineering, our graduates are ready to engage in ethical approaches to engineering, with concern for society and the environment.

ME – A Broad Discipline

The Mechanical Engineering program is designed to provide students with a wide range of options within the field of mechanical engineering. The discipline is very broad, encompassing elements of these areas:

* energy science and technology
* propulsion
* sensing and control
* nano- and micro-mechanics
* design

* mechatronics
* computational simulation
* solid and fluid dynamics
* microelectromechanical systems (MEMS)
* biomechanical engineering

The five engineering themes around which the department is built make this broad-based education possible:

* Biomedicine
* Computational Engineering
* Design
* Energy
* Multi-Scale Engineering

The five programs within the department are built around these themes where a continued emphasis on fundamental understanding of a range of engineering and scientific concepts is combined with a sensitized empathy for human need.

The department’s aim is to help produce academic and industry leaders. We believe that because of our unique and forward-thinking approach to research incorporating these five academic themes, as well as our emphasis on human-centered design and sustainability, our graduates are widely sought after.

Stanford University

Oddest Interview Questions Of 2010

1.How many basketballs can you fit in this room. This was a question asked by Google to one of the job seekers who felt it’s odd enough and an answer seems downright impossible.

2. If you were shrunk to the size of a pencil and put in a blender, how would you get out? The global investment banking and securities firm Goldman Sachs asked a job aspirant for the post of an analyst

3.Given the numbers 1 to 1000, what is the minimum numbers guesses needed to find a specific number if you are given the hint “higher” or “lower” for each guess you make – which left him with no guesses.The smart and the world’s biggest social networking site Facebook had a very smart but an off-the-wall question to a candidate applied for a software engineer post –

4.How many ridges around a quarter? The project analyst candidate was stunned with the whacky question by Deloitte interviewers for which a definite answer was impossible.

5.What is the philosophy of Martial Arts? – who really wished he knew a bit of martial arts then.A sales associate applicant was asked by the supplemental insurance Aflac

6.Explain me what has happened in this country during the last 10 years? – for a consultant post at Boston Consulting – too broad a question to even come close to answering.

7.How do you weigh an elephant without using a weigh machine? – A question beyond the reach of a software engineer to even attempt to answer it.IBM asked for a software engineer position:

8.Rate yourself on a scale of 1 to 10 how weird you are – asked at Capital One and the candidate wonders what would be the weirdness of this question.

9.If you had 5,623 participants in a tournament, how many games would need to be played to determine the winner? – A question that leaves the candidates with no other options but to call it a quit.Amazon asked to a managerial position

10.How many traffic lights in Manhattan? – Argus Information & Advisory Services asked during an interview for the position of an analyst.

11.There are three boxes, one contains only apples, one contains only oranges, and one contains both apples and oranges. The boxes have been incorrectly labeled such that no label identifies the actual contents of the box it labels. Opening just one box, and without looking in the box, you take out one piece of fruit. By looking at the fruit, how can you immediately label all of the boxes correctly?Apple showed its touch of uniqueness even in the interview with a question quite enough to confuse the candidate.

12.An apple costs 20 cents, an orange costs 40 cents, and a grapefruit costs 60 cents, how much is a pear?Another question asked for a project manager position at Epic Systems is even funnier

13.You have 8 pennies, 7 weight the same, one weighs less. You also have a judges scale. Find the one that weighs less in less than 3 steps. – Intel asked this during an interview for validation engineer.

14.How many bottles of beer are drank in the city over the week? – asked the global information and measurement firm, The Nielsen Company asked for a research analyst position.

15.Out of 25 horses, pick the fastest 3 horses. In each race, only 5 horses can run at the same time. What is the minimum number of races required? – asked for the position of a Financial Software Developer by Bloomberg LP.

-Got from a mail

A Turbocharger

The purpose of a turbocharger is to compress the air flowing into the diesel engine, this lets the engine squeeze more air into a cylinder and more air means that more fuel can be added. The engine burns air and fuel to create mechanical power, the more air and fuel it can burn the more powerful it is.

In simple terms, a turbocharger comprises of a turbine and a compressor connected by a common shaft supported on a bearing system. The turbocharger converts waste energy from an engine’s exhaust gases into compressed air, which it pushes into the engine. This allows the engine to burn more fuel producing more power and improve the overall efficiency of the combustion process.

The turbine consists of two components; the turbine wheel and the collector, commonly referred to as the turbine housing . The exhaust gas is guided into the turbine wheel by the housing. The energy in the exhaust gas turns the turbine. Once the gas has passed through the blades of the wheel it leaves the turbine housing via the exhaust outlet area.
Compressors are the opposite of turbines. They consist of two sections, the impeller or compressor wheel and the compressor housing . The compressor wheel is connected to the turbine by a forged steel shaft. As the compressor wheel spins, air is drawn in and is compressed as the blades spin at a high velocity. The housing is designed to convert the high velocity, low pressure air stream, into a high pressure low velocity air stream, through a process called diffusion.
In order to achieve this boost, the turbocharger uses the exhaust flow from the engine to spin a turbine, which in turn spins an air pump. The turbine in the turbocharger spins at speeds of up to 170,000 rotations per minute (rpm) that is about 30 times faster than most car engines can go. Since it is connected to the exhaust, the temperatures in the turbine are also very high. Air enters the compressor at a temperature equivalent to atmosphere. However, as compression causes the temperature of the air to rise it leaves the compressor cover at temperatures up to 200 degrees celcius.

The turbocharger bearing system is lubricated by oil from the engine. The oil is fed under pressure into the bearing housing , through to the journal bearings and thrust system. The oil also acts as a coolant taking away heat generated by the turbine.
The Journal Bearings are a free-floating rotational type. To perform correctly, the journal bearings float between two films of oil. The bearing clearances are very small, less than the width of a human hair. Dirty oil or blockages in the oil supply holes can cause serious damage to the turbocharger.

Hats off cummins

Reducing Diesel Emissions

innovative Selective Catalytic Reduction (SCR) Dosing System reduces CO2 and NOx emissions and improves performance, packaging, and long-term reliability of diesel engines.

In many parts of the world, diesel engines have grown from being the commercial transport powertrain of choice to also becoming the passenger car powertrain of choice. Delphi’s innovative Selective Catalytic Reduction (SCR) Dosing System will help diesel engines integrate well into a more environmentally responsible future.

“The Delphi SCR Dosing System offers a breakthrough technology that can help our customers significantly maximize their CO2 and NOx emission reductions,” said Larry Selby, marketing manager, Delphi diesel systems, Delphi Powertrain Systems. “Additionally, customers can reach their stringent emission goals and obtain high system value across a wide range of applications.”

Currently applicable to passenger cars and light commercial vehicles, Delphi’s SCR Dosing System injects aqueous urea solution at up to four times the pressure of any other comparable system. This allows the NOx reduction device to be placed close coupled to the engine, making use of the hotter environment to improve both NOx reduction and CO2 reduction potential.

“The close coupled path being pursued by Delphi allows our customers to achieve up to a 95 percent NOx reduction while saving up to 5 percent in CO2,” explained Peter Spadafora, Delphi product team leader, SCR systems, Delphi Powertrain Systems. “As an experienced diesel fuel injection supplier, Delphi had an excellent combination of design and high-volume precision manufacturing expertise necessary to develop our new system.”

This system is developed by Delpi , A well known engineering companey in US.