"Those early applications demonstrated how well-managed tract turbulence accommodates extra-lean air/fuel mixtures, and how swirl can improve combustion quality to reduce a mixture's sensitivity to detonation. The more mixture activity that occurs, the better the fuel remains in suspension and the better the mixture burns. The faster a fuel burns, the less ignition timing is required to produce equal power. And because wet fuel doesn't burn, or burns unevenly at best, swirl helps create and maintain a fully atomized air/fuel mixture"
