For a given compression ratio, as the mixture is made progressively rich from lean the mean effective pressure ____________
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When the mixture is lean ____________
For a compressor process with variable specific heat the peak temperature and pressure are ____________
Supercharging of S.I engines is employed only for aircraft and racing car engines.
____________ in supercharging pressure increases the tendency to detonate and pre-ignite.
The supercharged petrol engines have a lower fuel consumption than naturally aspirated engines.
Increased intake pressure and temperature reduces ignition delay and decreases flame speed.
The increased flame speeds make the petrol engine more sensitive to fuel-air ratio and engine cannot run on strong mixtures without knock.
Rich mixtures are used to control detonation, which further increases the specific fuel consumption of the engine.
The ignition timings and thermal load on the engine affect the knock limit of CI engine.
The ignition must be retarded at high intake pressure and temperature.
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