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What is a 4 stroke engine?
A four stroke engine is an internal combustion engine in which the process consists of 2
revolutions of crankshaft to complete 4 separate strokes up and down of a piston as one cycle.
The 4 stroke engine is commonly found on small vessels which contain higher power and are
faster. The strokes of a 4 stroke engine are intake, compress, power or combustion and
exhaust.
what are the separate stroke of a 4 stroke engine:
1. Intake Stroke - air drawn into the combustion chamber mixed with the fuel when the piston
descends in the cylinder bore, the intake valve will open which contains pressurized air coming
from the atmosphere to supply the required amount to combust.
2. Compression Stroke - After the intake stroke the intake valve is automatically closed and
another valve or the exhaust valve will remain closed as well. The piston ascends in the cylinder
bore where the piston compresses the air and fuel.
3. Power Stroke - After the air and fuel is being compressed, the piston descends in the cylinder
bore and creates space to react from the combustion that takes place to produce the engine
power.
4. Exhaust stroke - After the combustion takes place, The exhaust valve is automatically open in
which the piston pushes the burn gases into the exhaust valve to exit in the cylinder.
JASON A. FRENILA
BsMarE STUDENT

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What is a 4 stroke engine? A four stroke engine is an internal combustion engine in which the process consists of 2 revolutions of crankshaft to complete 4 separate strokes up and down of a piston as one cycle. The 4 stroke engine is commonly found on small vessels which contain higher power and are faster. The strokes of a 4 stroke engine are intake, compress, power or combustion and exhaust. what are the separate stroke of a 4 stroke engine: 1. Intake Stroke - air drawn into the combustion chamber mixed with the fuel when the piston descends in the cylinder bore, the intake valve will open which contains pressurized air coming from the atmosphere to supply the required amount to combust. 2. Compression Stroke - After the intake stroke the intake valve is automatically closed and another valve or the exhaust valve will remain closed as well. The piston ascends in the cylinder bore where the piston compresses the air and fuel. 3. Power Stroke - After the air and fuel is being compressed, the piston descends in the cylinder bore and creates space to react from the combustion that takes place to produce the engine power. 4. Exhaust stroke - After the combustion takes place, The exhaust valve is automatically open in which the piston pushes the burn gases into the exhaust valve to exit in the cylinder. JASON A. FRENILA BsMarE STUDENT Name: Description: ...
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