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Which compromise does a bi-fuel conversion accept?

  • A.Retention of the petrol compression ratio, so the knock resistance of the gas cannot be exploited at all
  • B.A compression ratio suited to petrol
  • C.None, since the engine adapts its compression ratio automatically according to the fuel that is being used
  • D.Nothing

Answer: B

A bi-fuel engine must keep a compression ratio the petrol can tolerate. The last option explains exactly that limitation, which makes it a correct and more instructive version of the same answer. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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