What is the compression ratio for these pistons?

These Mahle MS pistons are designed to achieve a 16.6:1 compression ratio. This is due to the combination of the 4.095-inch bore and the -41.8cc dish volume on each piston.

Are these pistons suitable for a stock Duramax engine rebuild?

These are cast performance pistons designed for builds aiming for improved performance. While they fit GM 6.6L Duramax engines, they are intended for applications that can utilize the higher compression ratio and specific dimensions for enhanced power.

What is the significance of the piston weight and wrist pin size?

Each piston weighs approximately 893 grams, which is a consideration for balancing the rotating assembly in a performance engine. The 1.358-inch wrist pin diameter is a standard size for many performance diesel applications, ensuring compatibility with appropriate connecting rods.

Mahle Duramax Piston Set 930029895

Name: Mahle MS Piston Set Duramax 4.095in Bore 3.898in Stk 6.417in Rod 1.358 Pin -41.8cc 16.6 CR Set of 8
Brand: Mahle
SKU: mahle-mahle-ms-piston-set-duramax-4-095in-bore-3-898in-stk-6-417in-rod-1-358-pin-t14-372176
Price: 1950.89 USD
Availability: BackOrder

Mahle MS Piston Set Duramax 4.095in Bore 3.898in Stk 6.417in Rod 1.358 Pin -41.8cc 16.6 CR Set of 8

$1950.89

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle Duramax cast performance piston set. 4.095in bore, 16.6:1 CR. Not CARB approved.

Key Features

Set of 8 cast performance pistons for GM 6.6L Duramax engines.
Features a 4.095-inch bore and a -41.8cc dish volume.
Achieves a 16.6:1 compression ratio.
Piston crown to wrist pin center height is 1.951 inches.
Includes 1.358-inch diameter wrist pins.
Designed for use with 6.417-inch connecting rods.

These pistons are designed for GM 6.6L Duramax 411 cu in engines. They are 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

These Mahle MS Piston sets are built for GM 6.6L Duramax engines, specifically for builds aiming for improved performance. Each piston features a 4.095-inch bore and a -41.8cc dish volume, contributing to a 16.6:1 compression ratio. This setup is designed to handle the demands of a performance diesel engine, offering a solid foundation for a rebuilt or upgraded top end.

Crafted from cast aluminum, these pistons are well-built for durability and performance. They measure 1.951 inches from the piston crown to the center of the wrist pin bore, and the wrist pin itself is 1.358 inches in diameter. The stroke is 3.898 inches, and they are designed to work with a 6.417-inch connecting rod. Each piston weighs approximately 893 grams, balancing strength with reasonable reciprocating mass for the engine's operation.

This set includes eight pistons, enough for a complete engine rebuild. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.