The belt in oil allows the same degree of design freedom as the dry belt. In comparison to a chain, both designs of belt have the advantage that timing belts with an odd number of teeth can be manufactured. This means it is easier to make adjustments to the entire arrangement. In contrast, smaller sprocket diameters are possible with chains without having a detrimental effect on the operating life.
With conventional wastegated turbochargers or fixed geometry turbochargers (FGT), a turbine flow area cannot be adjusted during operation.
Knocking is abnormal combustion in which the air-fuel mixture ignites prematurely due to exposure to high temperature and pressure, creating an unwanted high-frequency noise. When the compression ratio is increased, the temperature at compression top dead center (TDC) also rises, increasing the probability of knocking.