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Cat + Carbs

 

You can race a car on carbs, still use a cat  and shouldn’t lose a great deal of power, if the set up is right for the rest of the engine. I wonder!!


Running a cat with carbs on a power rich mixture means that they simply are not going to work. In order to reduce CO emissions a cat needs to be at a working temperature and to be presented with a burnt mixture in the ratio of 15 parts of air to one of fuel. This chemically correct ratio is known as ‘ stoichiometric ’ or Lambda 1. Even road cars fitted with cats come out of Lambda 1 when you accelerate hard or run flat out. This is why pollution in Germany is a real problem because some areas still have no speed limit and cat or no cat , you are pumping out CO on a power rich mixture. The idea of fitting a cat on a race car doesn’t make sense at all. The amount of pollution coming from race cars over a weekend is exactly like piddling in the ocean  to try and raise the water level. All it will do is make the cost of racing more expensive…… but it will be politically correct, even if it is meaningless in terms of practicality.


Since when did anything  political make sense in the real world?
Emissions will not be improved one jot but then the results don’t really matter, it’s all a big PR exercise.


With acknowledgements to Cars & Car Conversions, Stuart Turner and anyone else who has written on this subject in the past.
Until the next time               
Mark Tew.