Gasoline Engine Flashcards
I stationary position the engine speed is
800 rpm
Variable valve timing
Adjusting the cam shaft in a way that the valve inlet-outlet time can be changed
Lambda sensor
Emissions coming out of the exaust
CO, hydrocarbon, Knox,particulate matter
Why 3 oxygen sensor in exhaust
To monitor the changes in emissions before and after the catalytic convertor
why Secondary air system is used in gasoline engine
To increase the temp of the the catalyst in catalytic convertor
what is a Catalytic convertor
catalytic converteris anexhaust emission controldevice that converts toxic gases andpollutantsinexhaust gasfrom aninternal combustion engineinto less-toxic pollutants
GDI engine
Fuel is mixed inside the cylinder, due to this fuel and air do not mix properly due to which combustion is not proper and hence emission is not upto the mark I.e localised lambda is not 1.
GPF
Gasoline particulate filter component for filtering out emissions in GPF.
In GDI high pressure pumps are required, tru or false and why
True, coz Due to fuel going against the pressure inside the cylinder and hence it has to be relized with high pressure.
What is lean mixture?
Fuel content is less, air is more
What is rich mixture
Fuel content is more, air is less
SOHC
Single overhead camshaft
DOHC
Dual overhead camshaft
TDC in engine
Top dead centre
BDC in engine
Bottom dead centre
Air gas mixture used in
Petrol engine
What is engine knocking?
knock occurs when the peak of the combustion process no longer occurs at the optimum moment for the four-stroke cycle
Statiometric air-fuel ratio
14.7:1
Energy per litre of diesel
36.9 MJ
Energy per litre of petrol
33.7 MJ
Which engine does not use spark plug and why?
Diesel coz it has higher compression ratio and hence can be ignited using spark plug.
Who has more energy down to a molecule, petrol or diesel?
Diesel
What is Self ignition tempreture
temp at which the air-fuel mixture will ignite without the help of spark plug purely due to compression
compression ratios
ratio of Max to min volume of the cylinder.
Low idle RPM for 4 wheeler engine.
800 rpm
Low idle RPM for 2 wheeler engine.
1200 rpm
What is low idel rpm ?
It is the least minimum rpm required for sustaining the engine on its own without power.
