What material are these pistons made from?

These Mahle MS pistons are constructed from 4032 aluminum. This material is chosen for its balance of strength and thermal expansion characteristics, making it well-suited for performance engine applications.

What is the compression ratio achieved with these pistons?

These pistons are designed to achieve a 9.0 compression ratio when used with the specified stroke and rod length. They feature a -7.2cc dish volume to help achieve this ratio.

Are these pistons compatible with all Audi S4 models?

This piston set is specifically designed for the Audi S4 2.7L 6-cylinder, 5-valve turbo engine. It is not CARB approved and cannot be shipped to California.

Mahle MS Piston Set 81.50mm Bore 930070509

Name: Mahle MS Piston Set Audi S4 81.50mm Bore 86.4mm Stroke 154mm Rod 21mm Pin -7cc 9.0 CR Set of 6
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-audi-s4-81-50mm-bore-86-4mm-stroke-154mm-rod-21mm-pin--t14-182293
Price: 831.76 USD
Availability: InStock

Mahle MS Piston Set Audi S4 81.50mm Bore 86.4mm Stroke 154mm Rod 21mm Pin -7cc 9.0 CR Set of 6

$831.76

Only 5 left in stock

Mahle MS Piston Set for Audi S4 2.7L. Features 81.50mm bore and 9.0 CR for improved engine performance.

Key Features

Fits Audi S4 2.7L 6-cylinder, 5-valve turbo engines.
Set includes six forged pistons.
Features an 81.50mm bore and a 9.0 compression ratio.
Constructed from 4032 aluminum for strength and thermal properties.
Piston specs include 86.4mm stroke, 154mm rod length, and 21mm pin size.
Each piston has a -7.2cc dish volume and weighs 295g.

This piston set is designed for the Audi S4 2.7L 6-cylinder engine. It is not CARB approved and cannot be shipped to California.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

Mahle is a well-known name in engine components, recognized for their extensive experience and high-performance parts. This MS Piston Set is built for the Audi S4 2.7L 6-cylinder, 5-valve turbo engine, offering a direct replacement for those rebuilding or upgrading their engine's core components.

This set features pistons with an 81.50mm bore and a 9.0 compression ratio, designed to work with an 86.4mm stroke and a 154mm connecting rod. The pistons themselves are constructed from 4032 aluminum, a material known for its strength and thermal expansion properties, making it suitable for demanding engine builds. Each piston weighs in at 295g and includes a -7.2cc dish volume, contributing to the overall 9.0 compression ratio. The 21mm pin size ensures a solid connection to your connecting rods.

This set includes six pistons, providing a complete solution for your S4's engine. Please note that these pistons are not CARB approved and cannot be shipped to California. It's always recommended to consult your vehicle's service manual or a professional mechanic for specific installation procedures and torque specifications.