Also, the burned oil would foul the spark plug, increase the possibility of knocking and hamper the action of compression rings. This would increase oil consumption so that the engine would require the addition of oil at frequent intervals. Otherwise, it will go into the combustion chamber and burn. It must be scraped off and returned to the oil pin. For more oil reaches on the cylinder wall that is needed. Some connecting rods have an oil split hole which splits oils from the oil pan on the cylinder wall during each revolution of the crankpin. Wearing of ring and cylinder is also reduced. The load on the upper ring is reduced so that it does not press quite so hard on the cylinder wall. If there are two rings, this pressure will be divided between the two rings. During the power stroke, the pressure increases as high as 70 kgf/cm2 and would be difficult for a single compression ring to hold this much pressure. Usually, two compression rings are installed on the piston. As combustion starts, the pressure acts quickly on the upper lip of the ring, forcing out thus having good sealing with the cylinder wall. The headland ring also has the advantage of good sealing during the power stroke. Generally, the second and third compression rings are taper-faced and supplied to improve oil sealing.īy the use of headland ring on the piston of the special type having chamfered top, this space is eliminated so that the amount of unburned air-fuel mixture exhausted from the cylinder is reduced. An oil control ring is fitted into the lower groove of the piston. The number of compression rings tends to improve the compression ratio. In modern engines, there are two or three compression rings fitted into the top grooves. Three-piece steel rail type with an expander Compression Piston Rings. Read also: List of Car Engine Parts: Its Function (With Pictures) Types of Piston Rings:
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