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How self-ignition temperature of petrol be compared to that of diesel?

How self-ignition temperature of petrol be compared to that of diesel? Correct Answer Higher

Concept:

Self-Ignition Temperature (SIT) is the lowest temperature at which a diesel/Petrol will ignite itself without the presence of a spark or flame.

The Self Ignition Temperature of Diesel is 210°C and that of Petrol varies from 247°C to 280°C.

The lower SIT of Diesel is the reason behind the absence of a spark plug in a diesel engine.

The temperature of the fuel-air mixture in a diesel engine running at 1:20 compression ratio can go as high as 700°C. Since this temperature is much higher than the Self Ignition Temperature, diesel automatically catches fire at 210°C.

Petrol engines have lesser compression ratios compared to diesel engines (1: 8 - 10) and they rely on spark plugs for the source of ignition.

Generally, for hydrocarbon fuel, the Self Ignition Temperature increases with decreasing pressure.

Related Questions

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