The X-ray beam is attenuated to a higher degree. by calcium, therefore less photons pass through. bone to the detectors, resulting in its âwhiteâ. appearance on CT. White matter is less cellular, contains myelinated. axons (fat), and has a higher water content than. gray matter, resulting in slightly lower.
The piston ring (PR) is a split band pressed against the wall of the cylinder by springs (S) mounted in the inner junk ring (JR). The tongue (T) maintains the seal as the ring expands and splits apart. Spring-loaded piston rings. A pair of piston rings mounted on a 47mm two-stroke cycle scooter piston.A piston ring is a split ring that fits into a groove on the outer diameter of a piston in a reciprocating engine such as an internal combustion engine or steam engine. Sealing the combustion chamber so that there is no transfer of gases from the combustion chamber to the crank. 2  Supporting heat transfer from the piston to the cylinder wall. 3  Regulating engine oil consumption.
How Piston Rings Affect Horsepower. The rings seal the pistons to prevent air and oil from being drawn past the rings into the combustion chamber during the intake stroke. During the compression stroke, the rings make sure the air/fuel stays in the combustion chamber and is fully compressed before it is ignited. During the power stroke, the rings prevent pressure from blowing past the pistons as the burning gases shove the piston down. And during the exhaust stroke, the rings make sure all of the spent gases are pushed out of the exhaust port.