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Dart’s wet flow bench uses a testing liquid with the<br />
same specific gravity as gasoline, which has been laced<br />
with a fluorescent dye, allowing researchers to observe<br />
the behavior of the fuel as it flows through the head. In<br />
this manner, our head designers can see what designs<br />
encourage proper fuel atomization and avoid designs<br />
that cause fuel to congeal into solid streams or become<br />
overly turbulent.<br />
Wet flow has shown us some of the key design principles<br />
that optimize fuel behavior in a cylinder head. A port<br />
design that flows more fuel and air while remaining<br />
smaller will make more power. Sharp edges around the<br />
intake seats will shear the fuel flow and increase atomization,<br />
and thus, fuel flow. Through repeated trials Dart researchers<br />
have been able to collect hard data from the wet flow<br />
bench that has directly resulted in increased performance.<br />
A clear cylinder sleeve allows technicians to observe the physical behavior of<br />
the air/fuel mixture entering the chamber.<br />
Like dry flow benches and dynos, the wet flow bench is<br />
another weapon in Dart’s arsenal. The wet flow bench<br />
makes the formerly invisible movement of fuel and air<br />
readily apparent and it provides hard data on a cylinder<br />
head’s ability to move fuel and air efficiently.<br />
Traditional flow benches are still a useful tool in cylinder head development,<br />
but cannot provide any data regarding the fuel handling capabilities of a port<br />
or chamber design.<br />
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