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Why Do Exhaust Valves Use Sodium? Kia Stinger GT 3.3L V6 Review
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The 3.3L V6 twin-turbo in the 2018 Kia Stinger won a 2018 Ward’s Auto 10 Best Engines award. The aluminum engine produces 365 horsepower and 376 lb-ft of torque. The engine has a wide range of useful torque, and is also capable of adjusting valve timing for better fuel economy, closing the intake valves late to improve efficiency.

One of the interesting features of this engine are the sodium filled exhaust valves, and not just the stem, but the head of the valve is filled with sodium as well. Hyundai/Kia engineers state this can bring exhaust valve head temperatures down from about 800 deg C to 650 deg C. The sodium liquifies as it has a relatively low melting point, and as it splashes around within the valve it transfers heat from the head of the valve to the stem of the valve, which is cooled via the engine block cooling through the valve guides. This technology is certainly common in many other engines, but Kia claims this is the first use of sodium filled exhaust valve heads in a V6 engine.

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