A plunger in a port-helix metering pump with a lower helix would produce which of the following timing characteristics?
A) variable beginning, variable ending
B) variable beginning, constant ending
C) constant beginning, variable ending
D) constant beginning, constant ending

Question

Quizplus · Accepted Answer

A plunger in a port-helix metering pump with a lower helix results in a constant beginning because the start of fuel delivery is determined by the position of the plunger's lower edge relative to the port, which does not change. The ending of fuel delivery is variable because it depends on the rotation of the plunger and the helix's interaction with the port, which can change based on engine requirements.

A Plunger in a Port-Helix Metering Pump with a Lower