What are the characteristics of good petrol?
(a) It must be cheap and readily available.
(b) It must burn clean and produce no corrosion, etc. on combustion.
(c) It should mix readily with air and afford uniform manifold
distribution, i.e. should easily vaporize.
(d) It must be knock resistant.
(e) It should preignite easily.
(f) It must have a high calorific value.
(g) No sign of contamination, water, dirt, rust, etc.
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