Diesel Exhaust Fluid (DEF): The urea solution for diesel engines

Diesel Exhaust Fluid (DEF) Diesel exhaust fluid (also AdBlue) is a standardized urea solution consisting of a urea-water mixture. It is used to reduce nitrogen oxide emissions in diesel engines, which is achieved by a cathalytic reduction. Actually, you need ammonia, which is not easy to use in its pure form. Therefore, harmless urea is used, which […]

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Filter Systems in Cars

Various filter systems are performing many different functions in cars. In addition to the air filter and the oil filter, there are other filter systems such as fuel filters and cabin filters. Fuel Filter Fuel can contain various impurities which, among other things, reach the tank during filling. These are often, for example, pieces of […]

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Mercedes M 178 – The 4.0l V8-Biturbo Engine of the AMG GT

The Mercedes M178 As a sibling model of the M 177, the Mercedes M 178 DE 40 AL has modifications to the drivetrain and the oil supply, as well as lightweight construction elements. The powerful 4.0-liter V8 twin-turbo with direct injection is installed as a front mid-engine on the front axle of the AMG GT […]

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Secondary air injection on gasoline engines

The secondary air injection system of gasoline engines ensures a reduced emission of pollutants in the warm-up phase when starting the engine. During this time, the engine requires a mixture with fuel surplus until reaching the operating temperature, with the result that some of the fuel leaves the combustion chamber unburned. Since the lambda control […]

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Turbo-compound engine: The “cooler” turbocharger

A turbo-compound engine uses the exhaust gases through a downstream turbine. This can be installed in addition to a turbocharger. While the first exhaust gas turbocharger provides more boost pressure in the combustion chamber due to the exhaust gas energy and thus higher engine power, the second turbocharger converts the remaining energy into movement power. […]

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The Exhaust System

The exhaust system receives the exhaust gases escaping from the exhaust valves of the cylinders through the exhaust manifold. These are attenuated in their noise generation after they have been cleaned in the catalyst, and discharged into the environment at a suitable part of the vehicle. The entire system is connected to the underside of […]

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Direct Injection

In a diesel or gasoline engine with direct fuel injection, the fuel is injected through a nozzle with up to 200 bar directly into the combustion chamber. This mixes with the air that was introduced through the inlet valve. In gasoline engines with direct injection gasoline is supplied mainly in the compression stroke. In diesel […]

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