CP Pistons SC7637-4 Forged Piston & Ring Set 83mm 9.5:1 for Audi/VW 2.0T TSI EA8

Vehicle Fitment

• 2015-2021 Volkswagen Golf GTI Mk7/Mk7.5 (2.0L I4 TSI EA888 Gen 3, FWD)
• 2015-2021 Volkswagen Golf R Mk7/Mk7.5 (2.0L I4 TSI EA888 Gen 3, AWD)
• 2019-2021 Volkswagen Jetta GLI Mk7 (2.0L I4 TSI EA888 Gen 3, FWD)
• 2015-2020 Audi A3 8V (2.0L I4 TFSI EA888 Gen 3, FWD/AWD)
• 2015-2020 Audi S3 8V (2.0L I4 TFSI EA888 Gen 3, AWD)
• 2016-2022 Audi A4 B9 (2.0L I4 TFSI EA888 Gen 3, FWD/AWD)
• 2016-2022 Audi A5 B9 (2.0L I4 TFSI EA888 Gen 3, FWD/AWD)
• 2016-2022 Audi Q5 (2.0L I4 TFSI EA888 Gen 3, AWD)
• 2015-2020 Audi TT/TTS 8S (2.0L I4 TFSI EA888 Gen 3, FWD/AWD)
• 2015-2020 SEAT Leon Cupra Mk3 (2.0L I4 TSI EA888 Gen 3, FWD/AWD)
• 2015-2020 Skoda Octavia RS Mk3 (2.0L I4 TSI EA888 Gen 3, FWD/AWD)

Fitment Notes

• Designed specifically for the VW/Audi EA888 Gen 3 2.0L TSI/TFSI engine (2014+)
• Uses the OEM 23mm wrist pin diameter - compatible with factory connecting rods without modification
• Not compatible with the EA888 Gen 1 or Gen 2 2.0L TSI (different pin size and block architecture) - see SC7630 series for Gen 2 applications
• 83mm bore is +0.5mm oversize from the standard 82.5mm bore - requires boring and honing
• For aftermarket 22mm pin rod applications, see SC7634 (83mm) or SC7636 (83.5mm) instead
• Compatible with turbo, supercharger, and nitrous applications
• Requires professional engine assembly and machine work by a qualified builder

Features

• Forged from high-strength aluminum for superior durability under the high cylinder pressures of the direct-injection turbocharged EA888 Gen 3
• Dish-style piston crown (-9.50cc) produces a 9.5:1 compression ratio matching the factory specification
• OEM 23mm wrist pin compatibility allows use with factory connecting rods for simplified builds
• Fully CNC machined and balanced to within +/- 1 gram for smooth, vibration-free operation
• Accumulator groove reduces ring flutter and improves cylinder sealing under boost
• Dual forced pin oilers provide enhanced wrist pin lubrication during high-load conditions
• Deep valve reliefs accommodate high-lift camshaft profiles and oversized valves
• Custom skirt cam and barrel profiles for optimized bore contact and reduced noise
• Pin lock grooves included for secure and easy wrist pin lock installation
• Proudly manufactured in the USA

Specifications

• Part Number: SC7637-4
• Engine Application: VW/Audi EA888 Gen 3 2.0L I4 TSI/TFSI (2014+)
• Bore Diameter: 83mm (3.268", +0.5mm oversize)
• Stroke: 92.8mm
• Connecting Rod Length: 144mm
• Compression Height: 1.165" (29.6mm)
• Dome/Dish Volume: -9.50cc (Dish)
• Compression Ratio: 9.5:1
• Wrist Pin Diameter: 23mm (.905")
• Wrist Pin Part Number: 905-2250-18CP1C
• Ring Set Part Number: CPN-3268
• Lock Part Number: 905 073 SWL
• Piston Material: Forged Aluminum
• Product Series: CP Sport Compact
• Set Quantity: 4 Pistons

Included Components

• 4x CP-Carrillo Forged Pistons
• 4x Matched Piston Ring Sets (CPN-3268)
• 4x Wrist Pins (23mm, 905-2250-18CP1C)
• 4x Pin Locks (905 073 SWL)

Product Description

The CP Pistons SC7637-4 is a Sport Compact Series forged piston and ring set engineered for the Volkswagen/Audi EA888 Gen 3 2.0L TSI/TFSI turbocharged direct-injection engine. With an 83mm bore (+0.5mm oversize), 92.8mm stroke, and 144mm connecting rod length, this set is designed for the MQB-platform Gen 3 engine found across a wide range of 2014+ Volkswagen and Audi vehicles including the Golf GTI, Golf R, Jetta GLI, A3, S3, A4, A5, Q5, TT/TTS, as well as SEAT Leon Cupra and Skoda Octavia RS models. The -9.50cc dish crown produces a 9.5:1 compression ratio that matches the factory specification, making it a seamless upgrade from the OEM cast pistons without changing the boost or tune characteristics of the engine.

A key advantage of the SC7637 is its use of the OEM 23mm wrist pin diameter, which allows builders to retain the factory connecting rods without modification or replacement. This simplifies the build process and reduces cost compared to piston sets that require aftermarket rods with a different pin size. For builders who are already upgrading to aftermarket connecting rods with a 22mm pin bore, CP offers the SC7634 (83mm) and SC7636 (83.5mm) as alternatives. Each piston is fully CNC machined from high-strength forged aluminum and balanced to within one gram. Standard features include dual forced pin oilers, an accumulator groove for improved ring sealing under boost, deep valve reliefs for oversized valves and aggressive cam profiles, and custom skirt cam and barrel profiles for optimized bore contact.

The EA888 Gen 3 is one of the most widely tuned and modified production engines available today, with strong aftermarket support for upgraded turbochargers, intercoolers, fueling, and engine management. Whether you are building a stage 2+ Golf R targeting 400+ horsepower, upgrading an Audi S3 with a hybrid turbo and E85 fueling, or preemptively replacing the factory cast pistons with forged internals for long-term reliability under increased boost, the SC7637-4 provides the precision, strength, and factory-compatible design needed to support serious power goals while maintaining seamless integration with the OEM bottom end.