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I can see how it might achieve the claimed results.
With a two valve head and an offset spark plug, squirting a high-speed jet of mixture from the squish area across the chamber directed at the plug could give some improved mixing, increase turbulence and result in a faster flame front. This could lead to a faster and a more complete burn, equalling more power and better economy. Less ignition advance would be required to give the (higher) peak cylinder pressure just after TDC.
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