When I say my prototype is 50cc, I mean the volume of air moving into the cylinder is 50cc (49.5cc actually). Because I'm employing Low Temperature Combustion to prevent formation of NOx, however, my engine runs at now more than 0.48 equivalence (with 1.0 being stoichiometric). That means my effective displacement for comparison with other 50cc engines is 21.2 cc (meaning I'm putting in as much fuel as a 22.2 cc engine running at full stoichiometric). Why does this matter? Everyone regulates scooters to some cc figure (50cc being the lowest common figure) based on the amount of air they consume. As a result, I'm being penalized by the fact that I use Low Temperature Combustion to reduce emissions . Nonetheless, My analysis indicates an 11% improvement in torque, 76% reduction in fuel consumption, and 66% reduction in volume relative to the very popular GY6 engine (http://fixmychinesescooter.com/139qmb-gy6-50cc/) and even greater improvements relative to Honda's 50cc four-stroke (http://engines.honda.com/models/model-detail/gxh50).
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