VALVE, VALVE SPRING, VALVE SEAL, VALVE GUIDE [SKYACTIV-G 2.0]
2016 – MX-5 – Engine
VALVE, VALVE SPRING, VALVE SEAL, VALVE GUIDE [SKYACTIV-G 2.0]
Purpose, Function
Valve
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The intake valve is pressed down by the cam, the intake air passage is opened, and air is introduced into the cylinder.
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The exhaust valve is pressed down by the cam, the exhaust air passage is opened, and combustion gas is exhausted from the cylinder.
Valve spring
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The valve adheres to the valve seat by the valve spring pulling up the valve by spring force. As a result, the air seal in the combustion chamber is maintained.
Valve seal
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The valve seal prevents engine oil from entering combustion chamber through the valve guide, and engine oil consumption is suppressed.
Valve guide
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The valve guide maintains the valve stem to open and close the valve smoothly.
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The valve guide cools the valve by transmitting valve heat to the cylinder head.
Construction
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The valve, valve spring, valve seal, and valve guide are assembled to the cylinder head.
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The sliding resistance has been reduced by setting the valve spring load to the required minimum.
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The intake valve and exhaust valve are subjected to a nitriding treatment to enhance wear resistance.
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An unequal pitch valve spring has been adopted. In addition, the upper diameter is smaller compared to the bottom diameter.
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The valve guide is made of sintered alloy with excellent wear resistance.