Supertech Mitsubishi 4B11T 86.5mm Bore -4.6cc Dish 9:1 CR Pistons - Set of 4 (Excl Rings)

If you're rebuilding the engine in your Mitsubishi 4B11T, especially if you're looking to push more power or refresh a high-mileage powerplant, a set of quality forged pistons is a critical component. These Supertech pistons are built to handle the demands of a performance-oriented 4B11T engine, offering a solid foundation for your build. They feature an 86.5mm bore, which is the standard size for many 4B11T applications, and a dish volume of -4.6cc, resulting in a 9:1 compression ratio. This compression ratio is a good balance for many performance builds, allowing for increased power while still being manageable with appropriate tuning and fuel.

Forged pistons are significantly stronger and more durable than cast pistons, making them essential for engines that will see higher cylinder pressures, increased boost levels, or more aggressive driving. Supertech uses high-grade aluminum alloys and a forging process that creates a denser, more resilient piston structure. This means they can better withstand the heat and stress generated in a performance engine. The -4.6cc dish is precisely machined into the piston crown, which helps achieve the target 9:1 compression ratio when paired with the correct cylinder head volume. It's important to note that these pistons are sold as a set of four and do not include piston rings; you'll need to source those separately to complete the installation.

When undertaking an engine rebuild of this caliber, attention to detail is paramount. Ensure you have all the necessary supporting components, including new piston rings, bearings, gaskets, and fluids, before you begin assembly. Proper balancing of rotating assembly components is also recommended for optimal engine longevity and smooth operation. Remember that these pistons are not CARB approved and cannot be shipped to California.