What is one effect of excessive bore wear in a cylinder?

• Increased fuel efficiency

• Loss of compression

• Improved engine performance

• Reduced oil consumption

What symptom might occur if the crankcase becomes too pressurized?

• Increased engine power

• Oil leaks from engine seals

• Reduced engine noise

• Improved fuel economy

What is the approximate combustion pressure during the combustion stroke at 6000 rpm in petrol engines?

• 50 bar

• 75 bar

• 100 bar

• 25 bar

What is the load exerted on the piston due to combustion pressure at 6000 rpm?

• 3 t

• 5 t

• 7 t

• 9 t

What is the purpose of the piston pin offset in petrol engines?

• To increase engine speed

• To reduce fuel consumption

• To combat high wear on the cylinder wall

• To enhance combustion efficiency

By how much is the piston pin axis offset to combat pressure strain?

• 5-6% of the piston diameter

• 3-4% of the piston diameter

• 1-2% of the piston diameter

• 7-8% of the piston diameter

What is a second effect of a worn cylinder bore?

• Excessive blue smoke

• Increased fuel efficiency

• Reduced engine noise

• Improved acceleration

Which test is used to diagnose a worn cylinder bore?

• Compression test

• Brake test

• Speed test

• Temperature test

What action should be taken if a cylinder bore is worn?

• Dismantle engine and renew piston rings

• Increase oil levels

• Have the cylinder re-bored

• Replace the air filter

What is an advantage of using cylinder liners in engines?

• They are more expensive to replace.

• They allow for the use of standard pistons with new rings.

• They decrease engine capacity.

• They require larger pistons and rings.