Genuine Nissan 300ZX Exhaust Valve

The Nissan 300ZX Exhaust Valve functions to open up after the power stroke, allowing built-up burnt gases from each cylinder to escape. After this happens, the Exhaust Valve also seals the chamber to build compression for the next cycle. The camshaft lobes in the valvetrain of the Nissan 300ZX operate the lifters and pushrods on the exhaust rocker arm or follower to lift the Exhaust Valve to the proper position. It then opens again at the proper time. Meanwhile, coil springs return the Exhaust Valve to the seat of the plug to keep it shut until it is supposed to lift again. The seat pressure of a valve when the assembly is closed should be between 70 and 90 pounds. However, when the assembly is opened, the pressure should be greater than 200 pounds. This prevents misfire and valve float as the engine speed increases. Excess clearance between moving parts causes swinging or flapping motion, which increases the impact on the Exhaust Valve and can bend pushrods or break rocker arms. Too much lash lets hot gases out too soon, speeding up Exhaust Valve burning in the Nissan 300ZX. Many failures stem from overheating, while a burnt or cracked valve reduces power, causes rough running, and lowers fuel economy. Effectively managing the valve functioning assures good performance of the Nissan 300ZX.

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