All the indentations are spirally inclined along the axis, which increases the controlling accuracy of gasoline supply and avoids the problems of gasoline dropping and had atomization.

In F1, it is particularly important because of the strict fuel-flow limit rate of 100kg/hour.

In F1, thermal efficiency is a cause of concern as it has a strict fuel-flow limit rate of 100 kg/hour.

In F1's turbo-hybrid era it has become particularly important because of the strict fuel-flow limit rate of 100kg/hour.