Mahle 8250MS-10 Sport Compact Piston Ring Set 82.50mm Bore 1.0/1.2/2.8mm 4-Cyl

Vehicle Fitment

• Universal - fits any 4-cylinder engine with a 82.50 mm (3.248 in.) bore using a 1.0mm top ring, 1.2mm second ring, and 2.8mm oil ring
• Common applications include: VW/Audi 2.0T TSI/TFSI (EA888 Gen 1/2/3), Honda K-series, Toyota 2ZZ-GE/2ZR, Subaru EJ/FA, Mitsubishi 4G, and other sport compact inline-four engines with this bore size

Fitment Notes

• This is a universal performance ring set - always verify bore diameter (82.50 mm / 3.248 in.) before ordering
• Sold as a 4-cylinder set (4 complete sets, one per cylinder)
• Drop-in design with standard tension oil rings - no custom gap filing required for most applications
• Must be used with pistons machined to accept 1.0mm top ring, 1.2mm second ring, and 2.8mm oil ring grooves
• Verify ring groove dimensions of your specific pistons before ordering
• For single-cylinder (individual) ring sets at 82.50mm, see Mahle p/n 09301806

Features

• Steel nitrided top compression ring for exceptional hardness, wear resistance, and high RPM strength
• Reverse twist cast iron second ring for superior groove side sealing and oil control
• Standard tension 3-piece oil control ring assembly for reliable oil scraping across a wide range of applications
• Drop-in design pre-gapped for most sport compact builds - minimal prep time required
• Narrow 1.0/1.2/2.8mm ring pack reduces piston mass and friction for improved power output and high-rev performance
• Available in bore increments from 81mm to 100mm to suit a wide range of sport compact engines
• Engineered to Mahle Motorsport standards for builds requiring more than OE-grade ring sets
• Compatible with Mahle Motorsport and third-party forged piston builds at 82.50mm bore

Specifications

• Bore Size: 82.50 mm (3.248 in.)
• Top Compression Ring Thickness: 1.0 mm - Steel Nitrided
• Second Ring Thickness: 1.2 mm - Cast Iron, Reverse Twist
• Oil Ring Width: 2.8 mm - 3-Piece, Standard Tension
• Engine Type: L4 (4-Cylinder) - Drop-In Set
• Ring Design: Drop-In (standard tension, no file fitting required)
• Quantity: 4 sets (1 complete set per cylinder)

Included Components

• 4x Top Compression Ring (steel nitrided, 1.0 mm)
• 4x Second Compression Ring (cast iron, reverse twist, 1.2 mm)
• 4x Oil Ring Assembly (3-piece, standard tension, 2.8 mm)

Product Description

The Mahle 8250MS-10 is a Mahle Motorsport Sport Compact piston ring set designed for 4-cylinder performance engines with an 82.50 mm bore. This is a universal metric ring set - not a vehicle-specific OE replacement - and is intended for use with custom, OEM-spec, or aftermarket forged pistons machined to accept the 1.0/1.2/2.8 mm ring pack. The steel nitrided top ring delivers excellent hardness and scuff resistance under high cylinder pressures, while the reverse twist cast iron second ring provides tight groove side sealing and effective oil control.

The drop-in design with standard tension oil rings simplifies installation and makes this set well-suited for street performance builds, naturally aspirated high-rev applications, and lightly boosted sport compact engines. The narrow ring pack reduces reciprocating mass and friction compared to conventional 1.5mm+ ring sets, contributing to improved throttle response and top-end power. Always confirm bore size and ring groove dimensions in your pistons before ordering. For a single-cylinder ring set at this bore, see Mahle p/n 09301806.