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

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

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Automobile Engineering in ME
An imbalance wheel during vehicle operation

Creates a standing wave
Deflects in the vehicle's longitudinal direction
Bounces vertically or deflects from side to side (as seen from front or rear)
Makes large noise when its heavy point hits the road surface

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