[img:left]https://flic.kr/p/wETvRh[/img]
Looking at the picture above of a VW EA888 1.8 liter 3rd generation turbo engine, one can see that the fuel injector angle allows fuel spray to hit the back of the intake valves during the intake cycle. Other pictures of GDI engines that I've seen have the fuel injectors at a steeper angle or even at the top of the cylinder head, which does not allow fuel to spray on the intake valves.
The reason I ask is that some older VW FSI engines had carbon deposit problems on the back of intake valves due to the fact that direct injection does not actually let fuel wash the back of intake valves. Could VW have modified the angle of the newer generation engines to allow some fuel coming from the injectors to spray on the back of valves? It's just my theory and I'm looking to see other's opinions and expertise on this.
Looking at the picture above of a VW EA888 1.8 liter 3rd generation turbo engine, one can see that the fuel injector angle allows fuel spray to hit the back of the intake valves during the intake cycle. Other pictures of GDI engines that I've seen have the fuel injectors at a steeper angle or even at the top of the cylinder head, which does not allow fuel to spray on the intake valves.
The reason I ask is that some older VW FSI engines had carbon deposit problems on the back of intake valves due to the fact that direct injection does not actually let fuel wash the back of intake valves. Could VW have modified the angle of the newer generation engines to allow some fuel coming from the injectors to spray on the back of valves? It's just my theory and I'm looking to see other's opinions and expertise on this.
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