Andrew van den Heever
Member Since: 09 Jun 2007
Location: Cape Town
Posts: 340
  
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OK, so how do they get damaged or "blocked"? Is it a fuel quality problem? If so, then not really an issue for the petrol V8?
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 12th Mar 2011 8:13 am |
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heine
Member Since: 07 Feb 2007
Location: Midrand
Posts: 4054
 
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Bad fuel , lrp
From wikipedia
Catalyst poisoning occurs when the catalytic converter is exposed to exhaust containing substances that coat the working surfaces, encapsulating the catalyst so that it cannot contact and treat the exhaust. The most-notable contaminant is lead, so vehicles equipped with catalytic converters can only be run on unleaded gasoline. Other common catalyst poisons include manganese (originating primarily from the gasoline additive MMT), and silicone, which can enter the exhaust stream if the engine has a leak, allowing coolant into the combustion chamber. Phosphorus is another catalyst contaminant. Although phosphorus is no longer used in gasoline, it (and zinc, another low-level catalyst contaminant) was until recently widely used in engine oil antiwear additives such as zinc dithiophosphate (ZDDP). Beginning in 2006, a rapid phaseout of ZDDP in engine oils began.[citation needed]
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| 12th Mar 2011 10:58 am |
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