Description
The MAHLE Subaru STI PowerPak is a complete, race proven piston kit composed of hand de-burred, all forged, performance coated pistons, high quality steel wrist pins, round wire locks and low drag performance piston rings.
Performance coatings include a phosphate dry lubricant that is used to protect against ring micro welding and pin galling during initial start-up and engine break-in. For added performance, MAHLE applies it’s proprietary “Grafal” anti-friction coating to each piston skirt.
The MAHLE WRX PowerPak was designed as a completely finished drop-in piston assembly for your Subaru WRX or STI. Other than filing the included performance ring set, everything else is done for you.
* Forged from 4032 low expansion aluminum alloy for high strength and reduced piston to wall clearance
* Radiused valve pockets
* Forced Pin Oiling
* Precision Pin Fitting and Race Proven Round Wire Locks included
* 23mm high quality steel wrist pin (123 grams) included
* Precision Ring Grooves for 1.2, 1.2, 2.8mm rings included
WRX EJ20 Mahle Piston Specifications:
– Stroke: 75mm
– Rod Length: 130mm
– Pin Diameter: 23mm
– Compression Height: 32.7mm
– Dome Volume: -12
– Weight in Grams: 92.5mm = 348, 93mm = 353
– Compression Ratio: 8.0:1
STI EJ25 Mahle Piston Specifications:
– Stroke: 79mm
– Rod Length: Stock
– Pin Diameter: 23mm
– Compression Height: 30.7mm
– Dome Volume: -22
– Weight in Grams: 99.5mm = 399, 100mm = 401
– Compression Ratio: 8.5:1
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