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Which engines suit the alpha-n load calculation?

  • A.Turbocharged engines, whose manifold pressure exceeds atmospheric and therefore cannot be measured by a sensor
  • B.Diesel engines
  • C.Engines with a large plenum, in which the manifold pressure signal is steady and therefore easily measured
  • D.Those with individual throttle bodies or wild camshafts

Answer: D

Individual throttles give no usable manifold vacuum signal, so throttle angle and speed are used instead. A large plenum is precisely the condition under which speed density works well, which makes the last option describe the opposite case. 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 properties explain why these belong to one family, and the differences explain why more than one exists.

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