#si engine

Difference between SI and CI engines

Difference between SI and CI engines:

Spark Ignition Engines (S.I. Engine)It works on Otto cycle. In Otto cycle, the energy supply and rejection occur at constant volume process and the compression and expansion occur isentropically. The engines working on Otto cycle use petrol as the fuel and incorporate a carburettor for the preparation of mixture of air fuel vapour in correct…

What is Octane Number? How rating of SI Engines (Spark ignition engines) is done using an octane number?

Octane Number – Rating of S.I. Engine Fuels

What is Octane Number? How rating of SI Engines (Spark ignition engines) is done using an octane number?

The hydrocarbon fuels used in spark ignition (S.I.) engine have a tendency to cause engine knock when the engine operating conditions become severe. The knocking tendency of a fuel in S. I. engines is generally expressed by its octane…