What is the compression ratio with these pistons?

These Mahle MS pistons feature a 4.3cc dish volume, which results in a 12.4:1 compression ratio when used with the specified rod length and stroke in an Acura K24 engine. This is a notable increase over stock configurations.

Are these pistons suitable for a stock K24 engine rebuild?

While these pistons are well-built and forged for durability, the increased compression ratio (12.4:1) is intended for performance-oriented builds. You will likely need ECU tuning and potentially other supporting modifications to safely utilize this higher compression.

What does 'Not CARB approved' mean for shipping?

This means the piston set does not meet California Air Resources Board emissions standards. Consequently, it cannot be legally shipped to addresses within California.

Mahle K24 Forged Piston Set 87.25mm Bore 930024135

Name: Mahle MS Piston Set Acura K24 87.25mm Bore 99mm Stroke 139mm Rod 4cc 12.3 CR Set of 4
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-acura-k24-87-25mm-bore-99mm-stroke-139mm-rod-4cc-12-3--t14-169200
Price: 637.08 USD
Availability: InStock

Mahle MS Piston Set Acura K24 87.25mm Bore 99mm Stroke 139mm Rod 4cc 12.3 CR Set of 4

$637.08

Only 1 left in stock

Mahle MS Piston Set for Acura K24 2.4L. Features 87.25mm bore and 12.4 CR for improved performance.

Key Features

Fits Acura K24 2.4L engines.
Forged from 4032 aluminum for improved strength and heat resistance.
87.25mm bore size with a 99.0mm stroke.
Features a 4.3cc dish volume for a 12.4:1 compression ratio.
Each piston weighs 321g, balancing strength with rotating assembly weight.
Designed to work with a 152.0mm rod and a 22mm pin.

This piston set is designed for Acura K24 2.4L engines. Please verify compatibility with your specific vehicle application.

⚠️ 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

These Mahle MS pistons are forged from 4032 aluminum, a material known for its strength and ability to handle higher temperatures and pressures compared to cast aluminum. This set is specifically sized for Acura K24 engines, with an 87.25mm bore and a 99.0mm stroke, designed to work with a 152.0mm rod and a 22mm pin. The 4.3cc dish volume contributes to a 12.4:1 compression ratio, which is a notable increase over stock, aiming for improved engine response and power output when paired with appropriate tuning.

Mahle's MS piston line is built for durability and performance. Each piston weighs in at 321g, keeping rotating assembly weight manageable while still benefiting from the strength of forged construction. The 139mm rod length specified in the product details is crucial for achieving the correct piston deck height and compression ratio within the K24 block. These pistons are a solid option if you're rebuilding the top end of your K24 engine and looking for a reliable, well-built component that can handle increased performance demands.

It's important to note that this piston set is not CARB approved and cannot be shipped to California. Proper engine management and tuning will be essential to take full advantage of the increased compression ratio and ensure the longevity of your engine. Always refer to Mahle's installation guidelines for specific details regarding pin fitment and assembly.