shop-talk supported in part by Fat Chance Garage
http://fatchancegarage.com
Briggs&Stratton have used them for decades on some of their engines. In
this case, it does work, though not as the tornado folks claim. The
lawnmower engines with a long unheated manifold tube can suffer gasoline
dropout when idling, and stall. A twisted sheetmetal section is added at
the factory to the intake manifold to induce swirl and keep the gasoline
from dropping out.
In the case of a car, especially a modern fuel injected car, it's snake
oil.
The stunt they show with the inverted soda bottle is nothing more than
creating a vent hole in the center of the swirling water.
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