Automobile Engineering in ME
A basic difference between the spark ignition engine and the Diesel engine is that the

Air temperature ignites the fuel in the Diesel engine
Diesel engine compresses air alone instead of an air-fuel mixture
All of these
Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

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Automobile Engineering in ME
The crankcase dilution means

Dilution of mixture passing through crankcase in two stroke engines
Dilution of oil by water in the crankcase
Dilution of fuel in the crankcase
Dilution of lubrication oil by fuel in the crankcase D. Dilution

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Automobile Engineering in ME
The function of oil control rings is that it

Keeps the cylinder wall lubricated by holding oil in its channel
Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
Lubricates the cylinder wall by releasing oil from its hole
Maintains a seal and prevents escape of burned gases and oil leakage

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