Contemporary problems that mankind has faced especially in the last two decades, linked environmental protection and duplication fuel price increases, have led to the rediscovery fuel-based vegetable oils (biofuels) that can be immediate answers to solve these problems. But in an interesting and specifically, the use of biofuels immediately taken before a study-related consequences and effects on internal combustion engines.
The use of biofuels immediate result and the ease of application of technological methods for obtaining them, the most “complex” issue is resolved to obtain a required minimum productivity of crops to plant oil rentabiliza economic use of biofuels and alternative (partial or total) Supplying internal combustion engines.
Developing future (and present) of theoretical and experimental studies on biofuels has shown that, in addition to validate the results already obtained beneficial about practice, there are negative effects (for example, emission of pollutants on the basis of nitrogen oxides – NOx) which require the need for thorough study of the experimental field of biofuels.
For faithful reproduction of all operational conditions of the engines fuelled by biofuels, attempts are made through stands trial on the basis of a rigorous methodology and a well-defined norms in force. Stands the test of engines fuelled by biofuels have the advantage of enabling the location of a large number of sensors that take the necessary information, analyzed using computer systems.
The main structure of a test stand is shown in Figure 1.

Fig.1. The structure of a stand of experimental tests engines. (1-diesel, 2-injection pump, 3-coupling pump training, 4-pump food; regulator 5-speeds, 6-lever Command cremalierei, 7-battery filters, 8-high-pressure pipeline; 9-injector, 10 back-fuel pipeline, 11-pipeline liquid cooling, 12-reservoir water hydraulic brake, transmission cardanică-13, 14-hydraulic brake, the 15-time interpreter, the interpreter 16-speed, 17-weight brake; 18.19-electrical connectors, 20-block with tanks feed mixed with rapeseed oil and diesel, 21-power reservoirs with mixtures of rapeseed oil, diesel tank-22, 23-food pipeline, 24-ramp to connection, 25-d food pipeline, 26-radiator, 27-purchasing system data)

It should be noted that the results obtained by testing experimental engine with a compression-ignition (diesel) are specific type of engine tried as a series of parameters constructivi and functional specific to each engine (cilindre, injection pressure, stroke injection, fuel flow injected, the type of injectors, type of room burns, etc.). have direct influence on the results obtained. It is recommended that for each type of engine (or at least an engine representative of a wide-functional tipodimensional) be made a specific programme of tests on the stand and operational practice.
However, tests carried out may provide an overview of opportunities for optimum use of power engines with compression ignition biodiesel. | n this vein below are the results of the experimental parameters functional to feed the engine type D-118 (used in the construction of agricultural tractors Romanian) with biofuel-based vegetable oils.
functional main parameters that have been taken into consideration are the consumption zone (CZ), specific fuel consumption (which), when engine (M) and actual power (by).

Fig.2 Changes in fuel consumption zone depending on the type of biodiesel used (vegetable oil rape)

Fig.3 Changes in specific fuel consumption depending on the type of biodiesel used (vegetable oil rape)

Fig.4 Change timing depending on engine type used biodiesel (vegetable oil from rapeseed)

Fig.5 Change effective power depending on the type of biodiesel used (vegetable oil rape)

For the experiments carried out on the same type of engine, but which has been used pure vegetable oil sunflower, functional change the parameters of engine compression ignition is shown in the figure 6.

Fig.6 Change functional parameters of engine D118 to feed sunflower oil (1-work mechanical indicated, 2-average power indicated; average 3-pressure indicated; yield 4-wise, 5-average effective pressure, 6-power effective, 7-effective yield, 8-specific consumption of fuel actually).

Based on the experimental results obtained for engine D 118 (engine common in wheeled agricultural equipment) and study variations of these data presented in the previous figures, we can say that:
– Fuel Classic (diesel) can be successfully replaced with mixed vegetable oil + gas oil (biodiesel) both through the prism of maintaining relative performance engine and the decrease in the price of fuel cost;
– In terms of consumption zone is observed that this increase with the decrease in the percentage of vegetable oil, the best results being obtained for B50 and B20 mixture + 5% methanol. | n similarly can say that for specific fuel consumption, it is more than the use of biodiesel, but in a very close range of approximately 10%;
– The best results on the timing for the engine to obtain the mix B20 + 5% methanol which are nearing the moment powered by diesel engine speed of over 1,600 rot / min respectively for mixed classical B10-B50 is found a decrease;
– The closer the actual values of engine power are obtained for a B10 biodiesel, and for the mixture of vegetable oil + diesel maximum studied finds an actual decrease in power with 10-12%;
– To feed an engine compression ignition fuel based on sunflower is found measured by the experimental results of the main indicators of functional engine (mechanical work and indicated actually indicated an average pressure and effective power indicated, the effective power, performance wise and actually, etc.). that they have lower values of 10-12% compared with the use of diesel as fuel. Specific consumption of fuel actually increased in this case with 28-30%;
– It is said that the use of fuel based on sunflower oil (pure or mixed) offers advantages of supplying engine compression ignition, but in this case should be stressed that it is necessary to achieve changes in the structure and system construction Petrol engine (injector, injection pump, filter system, etc.)..

When i want to read more about global warming, i found an interesting article written by Nicola. He wrote about Global warming Fact or fiction. For you that interested and concern with global warming issue like me, may be this article will useful for you.

So, What is global warming? Is it Fact or Just a Fiction? Nicola will tell you from the article below:

Global Warming – Fact Or Fiction?

By Nicola Bullimore

Some people who have studied global issues would say there was no such thing as global warming and it is all a big hoax. However, others disagree and believe that since the industrial revolution, we are having a negative affect on our environment.

The best place to start is to look at what we have already been led to believe.

The Greenhouse effect is the relationship between the earth and the sun. The sun provides the earth with the heat and energy it needs and the earth releases back that energy into space.

The greenhouse effect comes into play as the gases in the earth trap that energy so that it cannot be released back into space therefore, warming the earths environment.

The greenhouse effect is a natural process and vital to our survival, without it, the earth would be too cold to live in.

Gases such as Methane, Carbon dioxide and water vapour all trap energy from the sun and enable the warming of the earth.

It is commonly known that plants provide Carbon dioxide, but not so commonly known that plants also remove carbon dioxide.

This is because, when a plant dies and is buried into the earth, these plants become fossil fuel which is coal and oil.

When coal and oil is burned, this then removes the carbon dioxide from the air around it.

200 years ago, before machinery was invented and cars filled our streets, global warming wasn’t an issue.

The natural gases which came from the earth would trap energy to warm the earth, however, since the industrial revolution, more gases are being produced, which means more energy is trapped and result is global warming.

Activists and researches cannot agree as to whether or not humans are causing global warming, but I think we can all agree that when something unnatural occurs, it affects the natural.

If we are producing more gases than what is known as natural, then you would expect that this would have an affect on our environment, but whether or not this affect is causing global warming, well, we will have to leave that down to the scientists.

It is said that in the last century the earth has warmed by 1%, although this is not a massive amount, it still could be an unnatural 1% which would have an effect on the earth’s climate.

The truth of the matter is, the earth works in a certain way that even the best scientists in the world cannot fathom it. We can never assume we know it all just as we cannot 100% rely on what we already believe we know as there could be many unknown factors that have not been taken into account.

It is natural to believe that we are having some kind of affect on our environment in comparison to 200 years ago, but is the cause of global warming? I guess we couldn’t say either way, but what we do know is that we need to keep it in mind and do what we can to help our environment.