In other words, only air, not fuel, touches the valve faces.ĭuring normal cruise operation, most GDI engines inject the fuel into the cylinder during the compression stroke, during which all the valves are closed. In a GDI engine, the gasoline is injected directly into the cylinder head or cylinder, under very high pressure, downstream of the intake valve. The fuel delivery in a GDI engine works differently. Even if the valves did get carbon-fouled over time, a can of a good fuel system cleaner like Redline, Lucas, Seafoam, or Techron in the gas usually took care of the problem. In both carbureted and port-fueled engines, the gasoline in the fuel-air mixture cleaned the intake valves as it passed over them. In other words, in what we now call a port injection engine, the fuel and air are mixed downstream of the throttle body, but before they get to the intake valve. The fuel was injected into each cylinder's intake port, usually located on the intake manifold, where it was mixed with air coming from the throttle body before entering the cylinder through the intake valves. In turbocharged engines, a pump called a turbocharger generated forced air that helped push the mixture into the manifold.įuel-injection engines did away with the carburetor and replaced it with something called the throttle body, which regulated air, but not fuel. If the engine was naturally aspirated, the mixture of air and gasoline was drawn from the carburetor into the engine's intake manifold by the vacuum created by the pistons' intake strokes. ![]() Traditional carbureted engines mixed the gasoline and air in the venturi of the carburetor. A mixture that contains a higher ratio of gasoline to air is referred to as rich, and a mixture that contains a lower ratio of gasoline to air is referred to as lean. The normal reference ratio of air to gasoline is 14.7 parts air to one part fuel and is called the stoichiometric mixture. This page discusses other maintenance that can help keep your car's GDI or T/GDI induction system clean.Īll gasoline engines burn a mixture of gasoline and air. Choosing the right oil for your GDI engine is part of this. Strictly speaking, this page isn't so much about oil as it is about how to keep the intake system, valves, and rings of GDI and T/GDI engines clean. ![]() Unfortunately, there's also a downside to the benefits of GDI engines, and that is that the induction systems, especially the intake valves, are more susceptible to deposits that can rob the engine of power, waste fuel, and cause oil burning. The "wrong" oil was very good oil but out of GM/Opel/Vauxhall spec.: it was perfect on my brother's 320d E90, on my old 1.5 DCI Renault engine, on my wife's Honda, my mom's Honda, sister's husband BMW.GDI (Gasoline Direct Injection) and T/GDI (Turbocharged Gasoline Direct Injection) engines are a relatively recent design that produce more power, using less fuel, with a smaller, lighter engine than more conventional engine designs. ![]() YES.not ruined engine/DPF/CAT but very annoyng situation with my sister's 2008 Opel ( Vauxhall) 1.3 CDTI DPF Meriva: with the "wrong oil", the DPF required a lot of regen, the oil level raised over the max level for several times so, after few regen, I was always obliged to due a oil+filter changes.įinally ( I taked several months to understand the problem was the oil ) after several oil+filter changes, I changed the oil quality as per GM spec. Does ANYONE have first hand experience (as opposed to anecdotal) of any engines, catalytic converters or DPF's ruined by someone filling them with the 'wrong' oil?
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