![]() There are disadvantages to using EGR too, in terms of fuel economy, performance and, in the case of diesels, the increased production of soot and particulates, but the latest engines use a variety of clever electronic control strategies to minimise the downsides while making full use of the EGR system. The recirculated exhaust gasses bring down the temperature of combustion, as NOx is produced at higher temperatures and pressures. The reason for this is to reduce the production of harmful oxides of nitrogen (referred to as NOx) to keep the car within legal pollution limits. Put simply, spent exhaust gasses are recirculated back into the inlet manifold to be used in combustion again. The principle applies to both petrol and diesel engines, though it's the latter that generally are more complicated and, sadly, more likely to gum up and require cleaning or replacement.Įxhaust Gas Recirculation is kind of self-explanatory, but it's quite a complicated and sophisticated measure. Here we're dealing with EGR valves that make up part of any 'external EGR' system. Some use what's called 'internal EGR', where there is no EGR valve as such. EGR stands for Exhaust Gas Recirculation and virtually all modern cars, petrol or diesel, employ this technique to control pollutants in the exhaust via an EGR valve. ![]()
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