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| PETCOCK |
| The fuel valve, usually found on the side of the gas tank. |
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| PINGING |
| Metallic noise produced by a faulty combustion cycle inside the cylinder also known as knocking. |
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| PLANAR LAMBDA OXYGEN SENSOR |
| In 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. |
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| PLUGS |
| One 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. |
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| 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). |
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| POLARIS |
| A brand of motorcycle, atv, and snowmobile produced in the United States. |
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| 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. |
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| 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. |
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| POWER COMMANDER |
| Fuel injection product from Dynojet. |
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| 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. |
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| PSI |
| Pounds 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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