IC Engine Firing Order Quiz

What is the firing order?

• The sequence of fuel injection in a Diesel engine

• The sequence of power strokes in each cylinder

• The correct placement of spark plug wires on the distributor

• The Engine Control Unit (ECU) takes care of the correct firing sequence

Why is choosing an appropriate firing order critical?

• To minimize vibration

• To improve engine balance

• To achieve smooth running

• All of the above

How does cylinder firing order improve the distribution of the fresh charge in the manifold?

• By drawing alternately from opposite ends of the manifold

• By separating successive cylinders

• By minimizing interference between adjacent cylinders

• All of the above

Why is separating successive cylinders during exhaust even more important than during induction?

• To prevent escaping of products of combustion from the cylinders (called scavenging)

• To minimize interference between adjacent cylinders

• To improve engine balance

• To minimize vibration

What can happen if the exhaust periods overlap with the cylinders?

• Exhaust-gas back pressure may occur

• Engine balance may be affected

• Vibration may increase

• Fresh charge distribution may be disrupted

Why is it desirable to have successive power impulses to alternate ends of the crankshaft?

• To minimize vibration

• To improve engine balance

• To prevent winding up of the crankshaft

• To suppress torsional vibrations

What is the purpose of the Engine Control Unit (ECU) in modern fuel injection engines?

• To improve engine balance

• To achieve smooth running

• To take care of the correct firing sequence and other engine management requirements

• To minimize vibration

Which cylinders are normally chosen for drawing alternately in the V-engine manifold?

• Cylinders from opposite ends of the manifold

• Cylinders from the same end of the manifold

• Cylinders from alternate cylinder banks in V engines

• Cylinders from adjacent cylinder banks in V engines

What can happen if the natural torsional oscillations of the crankshaft coincide with the power impulses?

• Engine balance may be affected

• Vibration may increase

• Torsional vibrations may occur..

• Fresh charge distribution may be disrupted

What takes care of the correct firing sequence in a distributer type petrol engine?

• The correct placement of spark plug wires on the distributor

• The Engine Control Unit (ECU)

• The sequence of fuel injection

• The fresh charge distribution in the manifold