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Detonation in petrol engines can be suppressed or reduced by the addition of small quantity of lead nitrate.

For best results of efficient combustion, high speed diesel engines need an approximate cetane number of 50.

Calorific value of diesel oil is of the order of 10000 kcal/kg.

Carbon residue in diesel oil should not be more than 0.1%.

In the case of 4-cylinder engines, the crankpins are 90 degrees apart. So, manufacturers use 1-3-4-2 as firing order for 4-cylinder engines.
The most popular firing order in case of four cylinder in-line I.C. engine is 1-3-4-2.

Freezing temperature of petrol is about 0.75.

For same compression ratio and for same heat added Otto cycle is more efficient than Diesel Cycle.

The efficiency of Carnot cycle is maximum for reversible engine.

For the same compression ratio, the efficiency of dual combustion cycle is less than Otto cycle and greater than diesel cycle.

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle is equal.

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