Spark ignition Engine

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What are the Spark ignition Engine and Compression ignition Engine?

self-ignition because of high temperature caused by high compression of air when fuel injected (no need of spark plug).
Works on Diesel cycle.
Diesel (low self-ignition temperature is desirable).
16 to 20 upper limit of C.R. is decided by weight and structure of engine also.
Fuel is directly injected to the cylinder at high pressure at the end of combustion.
A high-pressure fuel pump is required with an injector (Carburettor is eliminated).

Based on cycle: Spark ignition engine and compression ignition engine is based on Otto cycle and Diesel cycle, respectively.

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1. S.I. engines arrangement are lighter than C.I. engines.

2. Vibrations in S.I. engines is lower than C.I. engines.

1. Due to the lower compression ratio, the thermal efficiency got is lower.

2. Cost of fuel (petrol) is higher than Diesel.

1. Mopeds, scooters and motorcycles.

2. In small pumping sets and mobile electric generating sets.

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1. Thermal efficiency of C.I. engines is higher than S.I. engines because of its higher C.R.

2. C.I. engines have a major application than S.I. engines.

1. C.I. engines are heavier than S.I. engines for the same power output.

2. The vibration from the engine and the unpleasant odour in the exhaust are the major drawbacks.

1. In ship propulsion, jeeps, buses and trucks.

2. Tractors for agricultural application.