Description - Cylinder Block Components - GTDI 2.0L Petrol: Piston
| ITEM | DESCRIPTION |
|---|---|
| 1 | Compression surface - Exhaust side |
| 2 | Piston recess |
| 3 | Recess for high pressure injector |
| 4 | Upper compression ring |
| 5 | Lower compression ring |
| 6 | Oil control ring |
The piston crown has a recess for stabilisation of the fuel/air mixture. The recess is used together with the geometry of the intake path to optimise the transport of the intake air and the injected fuel to the spark plug.
The combustion chamber is enlarged by the piston recess. The piston has been finished in such a way that a compression surface is formed on the exhaust side of the piston crown. This compression surface is used to compensate for the material missing from the piston recess allowing the compression ratio to be achieved.