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Which conversion does a dedicated gas engine benefit from?

  • A.A raised compression ratio to exploit the knock resistance
  • B.Nothing, since the engine must remain unchanged in order that it may also operate upon petrol when required
  • C.A lower ratio
  • D.An increased compression ratio, which recovers the efficiency that a bi-fuel conversion is obliged to give up

Answer: A

A dedicated engine can raise its compression ratio and recover efficiency. The last option explains exactly that, which makes it a correct and more instructive version. Bi-fuel conversions cannot. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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