Diamond Racing Pistons Mercedes M157 Piston Kit

Diamond’s years of working alongside top sport compact race teams have helped generate an exceptionally robust line of sport compact pistons. Race proven designs are combined with precision CNC machining, strong 2618 forged aluminum, and premium Trend Performance wrist pins to deliver unmatched durability and performance. Whether you’re looking for more power, boost readiness, or chasing records and win lights on the racetrack, Diamond’s mild-to-wild sport compact line is ready to help you get there.

Technical Specifications

Product Market: Sport Compact Piston Series: M157 Product Type: Engine Piston Kit Piston Quantity: 8 Cylinder Quantity: 8 Bore Diameter: 98.00 MM Stroke: 90.50 MM Compression Height: 1.185 IN Compression Ratio: 10.00:1 Rod Length: 5.765 IN Piston Volume: -8.65 CC Piston Average Weight: Contact for Details Forging Type: Full Round VP Intake Depth: 0.045 IN VP Exhaust Depth: 0.045 IN Ring Set Included: Yes Ring Set Part Number: 09463858 Ring Set Thickness: 1.20 MM x 1.20 MM x 3.00 MM Top Compression Ring Thickness: 1.20 MM Second Compression Ring Thickness: 1.20 MM Oil Ring Thickness: 3.00 MM Oil Rail Support Included: No Wrist Pin Included: Yes Wrist Pin Part Number: H9452500190C Wrist Pin Dimensions: 0.945 IN x 2.500 IN Wrist Pin Outside Diameter: 0.945 IN Wrist Pin Length: 2.500 IN Wrist Pin Retainer Part Number: 015133-16 Wrist Pin Retainer Included: Yes Add-On Components: 015133-16 | 09463858 | H9452500190C

Upgrades the following OEM part numbers:

• Piston Part Number: A 157 030 05 17
• Piston with Rod Kit Number: A 278 030 06 20
• Other Compatible/Superseded Numbers: A 157 030 03 17, A 157 030 01 17, A 278 030 13 17
• Engine: M157.980 / M157.981 (5.5L V8 Twin Turbo)

Complete Fitment Guide

This piston kit is engineered specifically for the Mercedes-Benz M157 5.5L twin-turbocharged V8 engine. Verify your engine code before ordering.

Year | Make | Model | Submodel

2012-2016 | Mercedes-Benz | E63 AMG | W212

2013-2017 | Mercedes-Benz | E63 AMG Wagon | S212

2013-2018 | Mercedes-Benz | CLS63 AMG | W218

2011-2014 | Mercedes-Benz | CL63 AMG | C216

2015-2017 | Mercedes-Benz | S63 AMG Coupe | C217

2014-2020 | Mercedes-Benz | S63 AMG | W222

2013-2020 | Mercedes-Benz | SL63 AMG | R231

2012-2015 | Mercedes-Benz | ML63 AMG | W166

2016-2019 | Mercedes-Benz | GLE63 AMG | W166

2013-2016 | Mercedes-Benz | GL63 AMG | X166

2017-2019 | Mercedes-Benz | GLS63 AMG | X166

2015-2018 | Mercedes-Benz | G63 AMG | W463

Important Notes

• Engine Code Verification: Confirm M157 engine code before ordering. This kit is designed for the 5.5L twin-turbocharged V8 and is not compatible with M156 naturally aspirated or M113K supercharged engines.
• Professional Installation Required: Installation should only be performed by qualified technicians with proper tools and expertise.
• Engine Assembly: Proper ring gap verification, torque specifications, and clearance measurements are critical for reliability and performance.
• Material: 2618 forged aluminum construction provides superior strength for high-boost twin-turbocharged applications.
• Valve Pockets: Includes 0.045 inch valve pocket depth for both intake and exhaust sides to accommodate factory and performance camshafts.
• Boost Applications: Ideal for upgraded turbocharger systems and higher boost levels beyond factory specifications.
• Custom Options: Contact us for custom compression ratios, bore sizes, or specialized applications.

Performance Applications

Ideal for:

• Upgraded turbocharger systems and high-boost applications
• Stage 2+ and Stage 3 performance builds
• Engine rebuilds requiring stronger internals
• High-mileage engine refreshes
• Competition and racing builds
• Reliability upgrades for high-performance street vehicles
• 1000+ horsepower builds