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Ford Focus RS Mk2 2.5 Turbo Wossner Forged Piston Kit  652.05 
Ex Tax of 20% 

Overview

Wössner are regarded by Europe’s leading motor sport engine builders as being the piston of choice when building an engine not only to perform, but to withstand the stresses and duress’s of competition life. Wössner pistons feature a unique PTFE coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston. This helps remove the slapping noise during cold start, common place among engines running forged pistons due to larger then OE bore clearances. The crowns of the pistons are also polished to better resist detonation on a high performance engine. Polishing allows a more even spread of heat inside the chamber which will help prevent “hot spots” on piston crowns. Price includes all piston rings and gudgeon pins.

 

Crown features

On a Focus RS engine, this will give the factory Compression ratio of 8.5:1

If used to convert a Focus ST engine, this will lower the compression ratio from the factory 9.0:1 to 8.5:1

Specification

 

Part Number K9489
Engine Type

Focus RS Mk2 & Focus ST 2.5 (using RS Rod)

OE Bore Size 83.00mm
Bore Sizes Available

83.00mm - 2521cc

83.50mm - 2551cc

Stroke 93.2mm
Dome/Bowl Volume +11.5cc
Wossner Comp. Ratio

Focus RS Mk2 - 8.5:1

Focus ST Mk2 - 8.5:1

OE Comp. Ratio

Focus RS Mk2 - 8.5:1

Focus ST Mk2 - 9.0:1

Comp. Height 28.4mm
Valves Per Cylinder 4
Cylinders 5

 

Available Options:
K9489 Size Options:
83mm - K9489DA 
83.5mm - K9489D050 
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