Description

• The piston of choice for the very best engines
• Set of 5 pistons complete with rings & pins
• Available in stock size and 0.5mm oversize

Focus ST225 and RS Mk2 2.5 Pistons don’t get any better than the Mahle Motorsport PowerPak Forged piston kit. ( 22mm pin size )

Mahle’s PowerPak piston assemblies include forged pistons, piston rings, pins, and wire locks–all in one race-proven package. The pistons are hand-deburred and then coated with dry phosphate to protect against ring micro-welding and pin galling during initial startup. For additional performance, Mahle added its proprietary Grafal anti-friction coating to the piston skirts. Low drag rings, steel pins, and round wire locks to complete the Mahle PowerPak package.

PowerPak piston sets are Mahle Motorsport’s high volume shelf stock program developed for high performance enthusiasts and engine builders that want uncompromising reliability. They feature 8.5:1 compression ratio and hard anodised ring grooves along with Mahle double coating of dry phosphate to prevent micro welding and pin galling and grafal anti friction coating. Forged from Mahle proprietary M142S alloy these parts have the low noise characteristics of 4032 alloy with the strength of 2618.
Technical Specifications:
Model – Focus ST and RS
Engine – 2.5l
Bore – 83.00mm (83.50mm oversize)
Stroke – 93.20mm
Rod Length – 143.00mm
Compression Height – 30.40mm
Pin Diameter – 23mm (Does not suit stock ST225 rods)
Crown Volume – (-)10.77cc
Piston Weight – 324g
Compression Ratio – 8.5:1
Ring Layout – 1.0, 1.2, 2.8mm

Strong, lightweight, low drag forging superior to the traditional full round design. Mahle Motorsport pistons are produced on German manufactured custom forgings per part.

Every Mahle Motorsport piston is machined to exacting tolerances with focused attention given to the radial flatness of the ring grooves. A flat ring groove is essential in achieving and maintaining the best seal possible. The quality of the ring grooves is so critical to peak and lasting performance, that Mahle designed and built the machinery used to machine the ring grooves for its Motorsport piston assemblies.

Every Mahle Motorsport piston is supplied as standard with a high strength, light weight, German manufactured gudgeon pin. Other manufacturers offer high strength pins as a cost upgrade, with Mahle they are supplied as standard.

Mahle pioneered the use of piston ring simulation and computer development tools to engineer rings that provide free horsepower by successfully minimizing friction. Mahles ultra flat ring flanks and precision finish also maximise ring to piston sealing. The difference is evident on the dyno and the track.