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INTAKE OPENS - WHEN AND WHY - ON A MILD RACING CAM. In the cylinder and valve timing diagram (Figure 1) note that the intake valve begins opening 30°, before T.D.C. (top dead center) or before the piston actually starts on the suction (intake) stroke.. Naphtha 25-35%. Isopropyl Alcohol 10-20%. So you’re looking at a product that contains a lubricating oil, a solvent, and alcohol. All three products can act to break up engine deposits.. Static Vs. Dynamic Compression Ratio. Dynamic Compression Ratio (DCR) is an important concept in high performance engines. Determining what the compression ratio is after the intake valve closes provides valuable information about how the engine will perform with a particular cam and octane. Definition: The Compression Ratio (CR) of an engine is the ratio of the cylinder volume compared to.