What is the compression ratio of these pistons?

These Mahle MS pistons are designed to achieve an 8.5:1 compression ratio when installed in the specified Subaru EJ20/207 engines with a 75mm stroke and -12cc dish volume.

Are these pistons suitable for daily driving?

While these pistons are forged from strong 4032 aluminum and designed for performance, their 8.5:1 compression ratio is generally suitable for many daily driving applications when paired with appropriate tuning. However, they are not CARB approved and cannot be shipped to California.

What material are these pistons made from?

The pistons in this set are manufactured from 4032 aluminum. This alloy is chosen for its superior strength, thermal expansion properties, and durability under high-stress conditions compared to standard cast aluminum.

Mahle MS Piston Set Subaru EJ20/207 92mm Bore 8.5 CR 9300203

Name: Mahle MS Piston Set Subaru EJ20/207 92mm Bore 75mm Stroke 130.4mm Rod 23mm Pin -12cc 8.5 CR Set of 4
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-subaru-ej20-207-92mm-bore-75mm-stroke-130-4mm-rod-23mm-t14-135582
Price: 637.08 USD
Availability: InStock

Mahle MS Piston Set Subaru EJ20/207 92mm Bore 75mm Stroke 130.4mm Rod 23mm Pin -12cc 8.5 CR Set of 4

$637.08

Only 3 left in stock

Mahle MS Piston Set for Subaru EJ20/207 engines. Features a 92mm bore and 8.5:1 compression ratio for improved performance.

Key Features

Fits Subaru EJ20 and EJ207 engines.
Forged from 4032 aluminum for strength and heat resistance.
92mm bore size.
Features a -12cc dish volume for an 8.5:1 compression ratio.
Includes a 23mm wrist pin diameter and 130.4mm rod length.
Each piston weighs 346g.

This piston set is designed for Subaru EJ20 2.0L engines. Please verify compatibility with your specific engine model before purchase.

⚠️ 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, and they're particularly recognized for their high-performance pistons. This MS Piston Set is built for Subaru EJ20 and EJ207 engines, specifically designed for builds requiring a 92mm bore. These pistons are crafted from 4032 aluminum, a material chosen for its strength and ability to handle higher temperatures and pressures compared to cast aluminum, making them a solid choice for performance applications.

Each piston in this set has a 75mm stroke, a 130.4mm rod length, and a 23mm wrist pin diameter. The dish volume is -12cc, which, combined with the other specifications, results in a compression ratio of 8.5:1. This compression ratio is a notable step up from stock, offering a good balance for increased power without being overly aggressive for pump gas in many setups. The pistons weigh in at 346g each, which is a reasonable weight for forged pistons of this caliber, helping to keep reciprocating mass in check.

This set includes four pistons, all necessary hardware for installation, and is designed as a direct fit for the specified Subaru engines. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Additionally, they fall under Prop 65 regulations. For those rebuilding or significantly upgrading their EJ20 or EJ207 engine, this Mahle MS Piston Set offers a well-built foundation for a more powerful and durable powerplant.