Boxster (986) F6-2.5L (1998)
Piston Ring: Description and Operation
Pistons:
Image Legend:
1 Rectangular ring, nitrided steel, 1.2 mm symmetrically crowned.
2 Taper face ring, gray cast iron, 1.5 mm.
3 Three-part oil ring, nitrided steel, 2.0 mm.
The cast aluminium pistons are covered with an iron coating serving as the sliding layer. The piston-pin hole is offset by 0.8 mm towards the intake side.