![]() ![]() ideally one needs 14,7kg of air for 1kg of fuel. This ratio is measured on a ‘mass’ basis (not a volume basis) i.e. The commercial pump fuel that we use in karting can be ignited by the spark plug and burnt in the combustion chamber when the A/F ratio is as low as 7:1 (very rich mixture) all the way up to 20:1 (extremely lean), and the ideal ratio is in the region of 14,7:1 as this ensures complete combustion and also where we get the best utilization of the chemical energy present in the fuel. This process is something that we have no control over because it all has to do with the basic design of the carb itself, so we’ll leave that aspect up to the ‘pointy heads’ employed by the carb manufacturer. So what exactly are its main functions? Well firstly, it needs to thoroughly atomize the fuel into droplets and mix them into the incoming airstream because we want a constant air/fuel ratio (A/F ratio) present in the combustion chamber. ![]() There are many pre-requisites for a kart’s engine to function at peak performance, not least of which is the carburettor (the carb). ![]()
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February 2023
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