précatalyseur
English translation: primary catalytic converter
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| 13:29 May 17, 2002 |
| French to English translations [PRO] Tech/Engineering - Automotive / Cars & Trucks / automotive | |||||||
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|  Selected response from: Didier Fourcot Local time: 07:25 | ||||||
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| 4 +4 | primary catalytic converter |
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| 5 | pre-catalyser, pre-catalyzer |
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Answers
10 mins confidence: 
peer agreement (net): +4
peer agreement (net): +4primary catalytic converter Explanation: On some petrol vehicles designed for lean-mixture operation a primary catalytic converter very close to the exhaust manifold gets up to operating temperature very fast and remains hotter than the main catalytic converter, by the way the context places this part just above the downpipe (descente d'échappement), which makes this position very likely between the exhaust manifold and the downpipe. Honda among others explains the advantages of this: http://www.insightcentral.net/emissions.html "The head/exhaust manifold/catalytic converter configuration that allows the primary catalytic converter to get up to operating temperatures quickly. The second (NOx absorptive) catalytic converter designed for lean-burn conditions." On modern Diesel engines a primary catalytic converter is alos used with a secondary one that completes the conversion and sometimes may also trap the carbon particles (Peugeot) http://www.discountconverter.com/diesel/results.htm "The Primary Converter continues the NOX, HC, and CO reduction and conversion and aids in the light off of the Clean Up Converter substrate. The Clean Up Converter substrate finishes any reduction and conversion that still needs to be done as well as finishing the Particulate Matter reduction." |
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