Pistons

Pistons

The pistons on the new Boxster and Cayman models are forged from a light alloy. Since mixture formation is different on the basic models and the S version, the piston shape is also different.







Mixture formation and the direct fuel injection (DFI) combustion process require a special piston crown shape. The piston crown is a relatively large part of the combustion chamber and has a major influence on efficient combustion. Its shape also affects mixture formation and fresh fuel-air mixture stabilization in the spark plug area during injection processes in the compression phase in particular.

The pistons of the basic models have a conventional design.

Piston cooling

The piston crown temperature in the Boxster and Cayman engines is reduced by means of piston injection cooling. The spray nozzles are force-fitted in the crankcase. To ensure the necessary engine oil pressure at low revs and high engine oil temperatures, these spray nozzles only open at a higher oil pressure.