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The MAHLE Motorsports Power Pak kit is Mahle's high volume shelf stock
program developed for high performance enthusiasts and sportsman class
racers. The Power Pak pistons are predominately made from 4032 aluminum
alloy to allow for tighter cylinder to wall clearances, and improved
temperature stability. Some applications require 2618 alloy including
the Power Pak Plus category. Each kit is complete with a set of high
performance rings, containing a low drag 1.5mm, 1.5mm, 3.0mm set or
1/16’, 1/16”, 3/16” high performance Ring Pak standard with big block
kits.
EJ205 Stroker Piston Specifics (2.1 Liter Stroker): 92.5mm bore (.5mm over stock) For 79mm stroke Crank (OEM STI) with 130.4mm rod (OEM STI) -12cc Dome Volume Weight - 333 grams 8.0:1 Compression Ratio Forged from 4032 low expansion aluminum alloy for high strength & reduced piston to wall clearance Mahle part # is SUB193642I16
** Phosphate coating provides the grey appearance to the MAHLE piston. This dry lubricant coating (not to be confused with a thermal film coating) provides a lubricant film in the pin bores and ring grooves until the oiling system of the engine reaches operating pressure; particularly useful during the initial start-up or break-in of engines to protect against galling and microwelding. The piston crown is still machineable.
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