Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used ?
Correct answer: C. Spark plug fouling
- A. Vapour locking
- B. Hot starting
- C. Spark plug fouling
- D. All A, B & C
Explanation
Front-end volatility mainly influences vapour locking and hot starting because the most volatile components vaporise readily. Spark-plug fouling is more closely associated with heavier, less volatile fuel fractions, so it is the unaffected characteristic.
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