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Which ignition feature supports a direct injection stratified charge engine?

  • A.A wasted spark system, which fires twice per cycle and therefore ensures that the stratified charge is ignited
  • B.A magneto
  • C.A wide plug gap, which spans the region in which the stratified charge is concentrated near the spark plug
  • D.High energy multi-spark ignition with precise timing

Answer: D

Igniting a small rich cloud in a mostly lean cylinder needs energy, timing precision and often several sparks. Plug position and gap genuinely are optimised for the charge cloud, which makes the last option a real design consideration. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming what changes and what stays the same is the reliable route through questions of this shape. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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