JE Pistons is the leader in forged racing pistons. With 70-plus years of experience, in-house forging, and industry-leading technology, JE Pistons are designed to perform at the top levels of all forms of motorsports.
Bore (in) 3.406 Bore (mm) 86.5 Top Compression Ring Thickness 0.0400 Second Compression Ring Thickness 0.0480 Oil Ring Thickness 0.111 Forging Type FSR Volume (cc) -25.10 Series JE Pistons Piston Head Type Inv Dome/Dish Pin Diameter (IN) 0.866 Compression Height 1.220 Make BMW Wrist Pin Style - floating or press fit Floating Wall Type CHAMFERED Wall Thickness (IN) 0.150 Ringset Part Number JG1001-3405 Ring Brand ProSeal Ringset Included Yes Retainer Thickness 0.063 Retainer Lock Style Wire Lock Retainer Lock Part Number 866-063-MW Retainer Diameter (IN) 0.866 Replacement Single Piston 297170S Replaced By 288988 Piston Pin Inside Diameter 0.566 Piston Pin Material 5115 LOW CARBON STEEL, CASE HARDENED Piston Material 2618 Piston Pin Length (IN) 2.250 Piston Avg Wt 285 Pin Offset Yes Pin Brand JE Pistons Pin Part Number 866-2250-15-51C Pin Included Yes Pin Diameter (mm) 22.00 Oil Rail Support Included No Deck Clearance 0.030 Brand JE Pistons
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