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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).
Still using a revised variable geometry turbocharger, it also features an EGR cooler to lower NO X, with a bypass valve to avoid increasing hydrocarbon emissions before the engine reaches operating temperature, and a cylinder head optimized per Nissan's MK (Modulated Kinetics) combustion method. [4] Applications. 1998–2001 Nissan Presage
This causes excessive buildup in the cooler matrix, and when the engine warms up these solid chunks of buildup can detach from the EGR cooler and get sucked into the plastic intake tube, melting holes in the intake tube, causing a massive boost leak and in very rare cases an engine fire. BMW has issued a recall to over 1.6 million vehicles in ...
An internal wastegate is a built-in bypass valve and passage within the turbocharger housing which allows excess exhaust pressure to bypass the turbine into the downstream exhaust. Control of the internal wastegate valve by a pressure signal from the intake manifold is identical to that of an external wastegate.
newly developed EGR cooler; Euro Stage V emission rating; new Selective catalytic reduction (SCR) system with AdBlue additive significantly reduces NO x emissions (currently only in Mazda CX-7, in special 15.5 litres (4.1 US gal; 3.4 imp gal) tank located under the luggage compartment, lasts over 20,000 km (12,000 mi) under normal driving ...
The GM Ecotec engine, also known by its codename L850, is a family of all-aluminium inline-four engines, displacing between 1.2 and 2.5 litres.Confusingly, the Ecotec name was also applied to both the Buick V6 Engine when used in Holden Vehicles, as well as the final DOHC derivatives of the previous GM Family II engine; the architecture was substantially re-engineered for this new Ecotec ...