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.
Once the piston ring grooves are cleaned, and the piston wiped off, side clearance for the rings can be checked. This dimension is the clearance between a piston ring and the upper edge(usually called the inside edge) of the groove in which it rests. Piston ring side clearance performs an important function.xcess movement of a piston ring may also cause it to break. If clearance is too small, the ring may bind in its groove when the piston heats up and expands. To measure the piston ring side clearance, the ring does not need to be installed on the piston.