PETCOCKThe fuel valve, usually found on the side of the gas tank.
PINGINGMetallic noise produced by a faulty combustion cycle inside the cylinder also known as knocking.
PLANAR LAMBDA OXYGEN SENSORIn its basic operating concept the planar sensor corresponds to the heated finger-type element sensor by generating a response curve with a characteristic jump at lambda=1. At the design level the planar sensor is distinguished from the finger-type unit.
PLUGSOne example of the available connection techniques is the plug connection at the high-voltage terminal towers of the ignition distributor. Socket version A has only a relatively low high-voltage strength and is thus encountered only in isolated cases in original equipment applications.
POLLUTANT EMISSION The ignition angle Az or the ignition point has an important influence on the exhaust-gas values, the torque the fuel consumption and the drivability of the spark-ignition engine. The most important pollutants in the exhaust gas are the unburned hydrocarbons (HC), oxides of nitrogen (NOx) and carbon monoxide (CO).
POLARISA brand of motorcycle, atv, and snowmobile produced in the United States.
POST-START ENRICHMENT Enrichment with additional fuel improves the post-start performance at low temperatures. This function is calibrated to give satisfactory throttle response at all temperatures together with minimum fuel consumption.
POST-START PHASE Following low-temperature starts, supplementary fuel is required for a brief period, until the combustion chamber heats up and improves the internal mixture formation. This richer mixture also increase torque to furnish a smoother transition to the desired idle speed.
POWER COMMANDERFuel injection product from Dynojet.
PRESSURE CHARGING Because maximum possible torque is proportional to fresh-air charge density, it is possible to raise power output by compressing the air before it enters the cylinder.
PSIPounds per square inch (PSI) is the common unit of measurement for pressure. Normal atmospheric pressure at sea level is 14.7 psi.
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