Mahle MS Piston Set EJ25 99.50mm Bore 79.0mm Stroke 130.4mm Rod 23mm Pin -22cc 8.5 CR Set of 4

This Mahle MS Piston Set includes four forged pistons designed for EJ25 engines. Each piston measures 99.50mm in bore diameter, features a 79.0mm stroke, and uses a 130.4mm connecting rod with a 23mm wrist pin. The pistons have a -22cc dish volume, resulting in a compression ratio of 8.5:1 when installed. These are a popular choice for engine rebuilds where improved performance and durability are desired.

Mahle is known for well-built engine components, and these pistons are no exception. They are constructed from 4032 aluminum, a material chosen for its strength and resistance to expansion, which helps maintain proper clearances during operation. The specific design details, like the 99.50mm bore and the -19.3cc actual dish volume (which translates to the 8.5:1 CR), are critical for achieving the desired engine performance and reliability. Each piston weighs approximately 398 grams, contributing to a balanced rotating assembly.

When rebuilding an EJ25 engine, especially for performance applications, using a matched set of quality pistons like these from Mahle is essential. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always refer to your engine build specifications and manufacturer instructions for proper installation procedures and any additional components required for your specific application.