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the cylinder (known as Bottom Dead Centre or BDC) the exhaust valve starts to open. As the piston now moves up the cylinder, the hot gases (consisting mostly of nitrogen, carbon dioxide, water vapour and unused oxygen) are expelled from the cylinder. As the Piston approaches TDC again the inlet valve starts to open and the cycle repeats itself.
Fire Ringed Cylinder Heads. For more intense engine builds, the cylinder head gaskets can be superseded with the installation of fire rings. In a fire ringed cylinder head, a small groove is machined into the cylinder head around each individual combustion chamber. A metal ring is then inserted in this groove, which positively seals to the engine block once the cylinder head is torqued down.