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.
Problems with your car engine's piston rings often display symptoms or signs that are similar to other problems with low compression in a vehicle. 1  While the following symptoms are not always attributed to faulty piston rings, they are a good indicator that you should check the rings for wear and to see if they need to be replaced. Here is a list of the most common symptoms for bad piston rings: 1  White or gray exhaust smoke. 2  Excessive oil consumption. 3  Low power for acceleration. 4  Overall loss of power or poor performance.