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The goal of EGR is thus to reduce NO x production by reducing the combustion temperatures. In modern diesel engines, the EGR gas is usually cooled with a heat exchanger to allow the introduction of a greater mass of recirculated gas. However, uncooled EGR designs do exist; these are often referred to as hot-gas recirculation (HGR).
AUDI AG. February 2005. Archived from the original (MS Word document) on 27 July 2011 "Geneva Motor Show: Audi RS4 – The Sports Car for 365 Days a Year". VWvortex.com – Audi News. AUDI AG. 1 March 2005. Archived from the original on 16 July 2011 "New Audi RS4". WorldCarFans.com. AUDI AG – press release. 5 September 2005.
The EA111 series of internal combustion engines was initially developed by Audi under Ludwig Kraus’s leadership and introduced in the mid-1970s in the Audi 50, and shortly after in the original Volkswagen Polo. It is a series of water-cooled inline three- and inline four-cylinder petrol and diesel engines, in a variety of displacement sizes.
The second radiator is plumbed in series with the main radiator in the circuit. This was the case when the Audi 100 was first turbocharged creating the 200. These are not to be confused with intercoolers. Some engines have an oil cooler, a separate small radiator to cool the engine oil.
[77] [full citation needed] In turbocharged engines, EGR needs a controlled pressure differential across the exhaust manifold and intake manifold, which can be met by such engineering as use of a variable geometry turbocharger, [citation needed] which has inlet guide vanes on the turbine to build exhaust backpressure in the exhaust manifold ...
The following list of Audi vehicles, including past and present production models, as well as concept vehicles and limited editions. The current era of Audi production dates to 1968, when present-day owner Volkswagen Group , which had purchased Auto Union from Mercedes-Benz in 1965, debuted the first modern Audi-branded vehicles.
Up to $10 billion will be paid to 475,000 Volkswagen or Audi owners whose cars are equipped with 2.0-litre diesel engines. Owners can also opt to have their car repaired free of charge or can sell it back to the company, who will pay back its estimated value from before the scandal began.
With low octane fuel, a problem would occur as the compression ratio increased as the fuel was igniting due to the rise in temperature that resulted. Charles Kettering developed a lead additive which allowed higher compression ratios, which was progressively abandoned for automotive use from the 1970s onward, partly due to lead poisoning concerns.
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