Piston: Description and Operation

Pistons and Connecting Rods






The pistons are made of a high strength aluminum alloy. The top land height has been decreased to reduce emissions. Piston skirts are coated with a solid lubricant for scuff resistance. The connecting rod is forged steel with a fractured connecting rod cap design. The connecting rod is also equipped with a squirt hole and attaches to the piston with a full floating pin retained by lock rings.

The piston rings include a moly-filled top ring (1) with a symmetrical barrel face. The intermediate piston ring (2 or 3) is of the Micro-Napier design. The Micro-Napier design has a reduced "hook" on the running face, removes the need for chroming and improves oil economy. The oil control package consists of two steel rails (4) and an expander spacer (5).