Description
Wössner Ford ST/RS 2.5 5‑cyl 20V Turbo Pistons – Specs
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Engine: Ford 2.5 5‑cyl 20V Turbo (HYDA / HUWA / Duratec I5, as used in Ford Focus ST / Ford Focus RS Mk2)
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Bore Size: 83.5 mm (also available 83.0 mm / 84.0 mm depending on oversize)
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Stroke: 93.2 mm
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Compression Ratio (stock spec): 8.5:1 for the 83.5 mm kit
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Material: Forged alloy (4032‑T6)
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Compression Height: ~28.4 mm
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Pin Diameter (Wrist Pin): 21 mm
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Included Components: Pistons, piston rings, wrist pins, circlips
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Fitment Options: 83.0 mm standard bore, 83.5 mm oversize, 84.0 mm oversize — depending on block condition and machining.
Application
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Vehicles / Engines: Ford Focus ST / RS Mk2 2.5 20V Turbo (HYDA/HUWA Duratec I5)
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Use: Turbocharged performance builds, forged engine rebuilds, motorsport or high‑boost street/track applications
