Mahle MS 78-89 Porsche 930 Turbo 3.3L to 3.4L 98mm Bore 74.4mm Stroke 127mm Rod 23mm Pin 14.2cc 7.7CR - PS98-009

MAHLE Motorsport piston and cylinder kit for the Porsche 930 Turbo 3.3L (MAHLE catalog lists 1978-1992), taking it to 3.4L with a 98 mm bore on the 74.4 mm stroke. The kit pairs a set of six forged 4032-alloy pistons (PP98-012) with matching PC98-001 cylinders and includes a 1.2 / 1.2 / 3.0 mm performance ring set. With a 14.2 cc crown it runs a 7.7:1 compression ratio.

MAHLE's relationship with Porsche dates back to Porsche's beginning, and MAHLE Motorsport North America drew on that OE and racing experience to develop its air-cooled performance kits. The pistons are machined from forgings with narrower, shorter skirts to reduce weight and friction, and the cylinders are produced and machined to original-equipment tolerances for performance, durability and longevity. These kits are modern adaptations of the original parts, so visual differences from factory components are intentional.