Manley Platinum Series Piston Set Ford Focus RS (LZ) / Mustang EcoBoost (FM / FN / FO)

$1,460.00
SKU: 637000C-4
Series
Bore Size
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Manley Platinum Series Piston Set Standard / 87.50mm (STD)$1,460.00

Manley Platinum Series Piston Set - Ford Focus RS (LZ) / Mustang EcoBoost (FM / FN / FO)

Manley Platinum Series forged pistons for the 2.3L EcoBoost in the Ford Focus RS (LZ) and the Mustang EcoBoost (FM / FN, including the High Performance, and the 2024-on FO). They're made from 2618 alloy forgings with moly-coated skirts and a dished crown that gives 9.5:1 compression, so they suit a high-boost build that keeps the factory 94 mm stroke and 5.875 in rods.

Two versions are offered. The Standard Series comes with 0.150 in wall chrome moly wrist pins. The Extreme Duty Series is the same piston with thicker 0.210 in wall 9310 alloy pins for more boost and power. Every set includes Manley Premium Steel top ring sets and round wire locks, so it's ready to fit once the bores are finished.

Which set do I need?

Part number Bore Piston weight Rings included
637000C-4 (Standard)
637000CE-4 (Extreme Duty)
87.50 mm (standard) 382 g 46875-4
637001C-4 (Standard)
637001CE-4 (Extreme Duty)
87.60 mm (+0.10 mm) 384 g 46876-4
637005C-4 (Standard)
637005CE-4 (Extreme Duty)
88.00 mm (+0.50 mm) 390 g 46880-4

Note: Suits the 2.3L EcoBoost in the Ford Focus RS (LZ) and the Mustang EcoBoost (FM / FN, including the High Performance, and the 2024-on FO). Choose the bore size that matches your finished cylinder bore. Recommended piston-to-wall clearance is 0.0030 in, measured 1.100 in up from the bottom of the oil ring. Uses a 22.5 mm (0.886 in) wrist pin, which matches the Manley H-Beam rod set. Installation by a professional engine builder is recommended.

Features

  • 2618 high-strength forged alloy, lightweight design
  • Offset wrist pin for quiet start-ups
  • Moly-coated skirts to cut friction and scuffing
  • Dish crown: -8.2 cc, 9.5:1 compression ratio
  • Pressure balance groove for better ring seal
  • Valve reliefs take valves up to 1 mm oversize
  • Standard Series: 0.150 in wall chrome moly pins; Extreme Duty: 0.210 in wall 9310 alloy pins
  • Premium Steel top ring sets and round wire locks included
  • Set of 4: one engine

Pairs Well With

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