Mahle MS Piston Set Honda/Acura K20 86mm Bore 86mm Stroke 139mm Rod 22mm Pin 12cc 12.7 CR Set of 4

If you're rebuilding the engine in your Honda or Acura K20, a solid set of pistons is crucial for reliable power. This Mahle MS piston set is built for the K20 engine, featuring an 86mm bore and designed to work with an 86mm stroke and a 139mm connecting rod. The 22mm wrist pin is a standard size for many performance applications, and the 12cc dish volume contributes to a 12.6:1 compression ratio, which is a notable bump over stock for improved engine response.

Mahle uses 4032 aluminum for these pistons, a well-known material for its strength and durability in performance engines. This alloy offers good thermal expansion properties, helping to prevent piston slap and maintain a tight seal even under demanding conditions. Each piston weighs in at 329 grams, keeping rotating mass in check for better engine acceleration. This set includes four pistons, all the necessary components for a complete engine rebuild.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For optimal installation and performance, it's always recommended to consult your engine's service manual or a professional mechanic for specific assembly procedures and torque specifications.