ENGINE MECHANICAL QUESTIONS AND
ANSWERS UPDATED 2026
# Term Definition
1 What is the four stroke cycle? Intake, compression, power, exhaust
2 Air/Fuel mixture enters the combustion chamber.
What happens in the intake stroke?
3 Air/Fuel mixture is compressed.
What happens in the compression
stroke?
4 Air/Fuel is ignited by spark plug.
What happens in the power stroke?
5
Burned Air/Fuel gases are forced out of the combustion
What happens in the exhaust stroke?
chamber.
6 What is the Air/Fuel mixture ratio?
14.7 to 1 for gas mixture. Varies for the diesel engine
depending on how much fuel is injected
7 Spark
What is the ignition method for gas?
8 Compression
What is the ignition method for diesel?
9
Enhances engine horsepower by forcing more air in to the
What is the funtion of the supercharger?
cylinders.
10 What drives the supercharger? A belt driven by the crankshaft.
, 11
What controls the output of the
ME control module through an electromagnetic clutch.
supercharger?
12 1100 mbar.
What is the maximum charge pressure
for the 112 engine?
13
What is the function of the turbo Enhances engine output by forcing more air in to the
charger? cylinders.
14
Where is the location of the turbo
Normally located on the exhaust manifold of all engines.
charger?
# Term Definition
15 What drives the turbo charger? Exhaust gases.
16 ME control module.
What controls the turbo charger output?
17
What is the purpose of the intercooler? Cools the air heated up by the compression during intake.
18 Where is the intercooler located? Below the radiator.
19
Tuning the intake manifolds to optimize the pressure
How can engine breathing be enhanced?
pulses in the intake system.
20 Variable Runners.
What is used to increase the efficiency of
the intake manifold and broaden the
torque range?
21 The long runners, to increase the airs velocity.
In variable runners where is the air
directed at low RPM's?
ANSWERS UPDATED 2026
# Term Definition
1 What is the four stroke cycle? Intake, compression, power, exhaust
2 Air/Fuel mixture enters the combustion chamber.
What happens in the intake stroke?
3 Air/Fuel mixture is compressed.
What happens in the compression
stroke?
4 Air/Fuel is ignited by spark plug.
What happens in the power stroke?
5
Burned Air/Fuel gases are forced out of the combustion
What happens in the exhaust stroke?
chamber.
6 What is the Air/Fuel mixture ratio?
14.7 to 1 for gas mixture. Varies for the diesel engine
depending on how much fuel is injected
7 Spark
What is the ignition method for gas?
8 Compression
What is the ignition method for diesel?
9
Enhances engine horsepower by forcing more air in to the
What is the funtion of the supercharger?
cylinders.
10 What drives the supercharger? A belt driven by the crankshaft.
, 11
What controls the output of the
ME control module through an electromagnetic clutch.
supercharger?
12 1100 mbar.
What is the maximum charge pressure
for the 112 engine?
13
What is the function of the turbo Enhances engine output by forcing more air in to the
charger? cylinders.
14
Where is the location of the turbo
Normally located on the exhaust manifold of all engines.
charger?
# Term Definition
15 What drives the turbo charger? Exhaust gases.
16 ME control module.
What controls the turbo charger output?
17
What is the purpose of the intercooler? Cools the air heated up by the compression during intake.
18 Where is the intercooler located? Below the radiator.
19
Tuning the intake manifolds to optimize the pressure
How can engine breathing be enhanced?
pulses in the intake system.
20 Variable Runners.
What is used to increase the efficiency of
the intake manifold and broaden the
torque range?
21 The long runners, to increase the airs velocity.
In variable runners where is the air
directed at low RPM's?
