Engine Liters and performance?

Although I prefer to see a theoretical and comprehensive answer, I will try and explain it in layman's terms.

The practical answer is no, a 3 litre engine does not use 3 litres of fuel for combustion. If the cylinder was just filled with fuel then we wouldn't have space for air for combustion.

The internal combustion engine based on the number of strokes would have either 2 or 4 strokes. Let us consider a 4 stroke engine, in each stroke we would have a different function of the piston. Hence we have the suction stroke, the compression stroke, the expansion stroke and the exhaust stroke.

For your question let us consider the suction stroke in a petrol engine. This stroke allows the air fuel mixture to be sucked in, into the 3 litre cylinder. The air to fuel ratio in a petrol engine varies from say 10:1 to 20:1. This implies for every litre of fuel sucked there should be 10-20 litres of air sucked in. Hence in a 3 litre engine the fuel taken in would be 2.73 litres of air to 0.27 litres of fuel (10:1) or 2.85 litres of air to 0.15 litres of fuel (20:1). Hence depending on the compression ratio and the engine size we may be able to determine the amount of fuel injected.

Hope this clarifies your question regarding intake of fuel.

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