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Which mechanism advanced the timing with speed on a distributor?

  • A.A vacuum capsule connected to the inlet manifold, which advanced the timing as the depression increased with speed
  • B.A stepper motor
  • C.An eccentric bush within the distributor drive, which rotated as the speed rose and therefore advanced the timing
  • D.Centrifugal weights acting against springs

Answer: D

Bob weights flew outward against springs and rotated the cam relative to the shaft. The vacuum capsule provided load related advance, which makes the second option a real mechanism serving the other variable. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking which component actually carries the load settles most questions of this kind at once. The shared behaviour explains why these belong together and the differences explain why both exist.

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