Which stroke of the four-stroke cycle is shown in the figure above? Answer Expert Verified
The Exhaust stroke
. The exhaust stroke is the final stroke of the four-stroke cycle engine. It occurs when the stroke valve is open and the intake valve is closed as can be seen in the picture above.
What are strokes of a 4-stroke cycle?
An internal-combustion engine goes through four strokes:
intake, compression, combustion (power), and exhaust
. As the piston moves during each stroke, it turns the crankshaft.
What is the 1st stroke of a 4-stroke engine called?
The four separate strokes are termed: Intake: Also known as induction or suction. This stroke of the piston begins at
top dead center (T.D.C.)
and ends at bottom dead center (B.D.C.).
What is the correct order of the 4 strokes?
The four strokes are as follows:
• intake stroke • compression stroke • power stroke • exhaust stroke Two strokes
occur during each revolution of the crankshaft. Therefore, a four-stroke cycle requires two revolutions of the crankshaft. Figure 5-1 illus- trates each of the four strokes taking place in proper sequence.
Which stroke for a 4-stroke IC engine is considered as the working or power stroke?
Process 3 to 4
: The thermal energy in the chamber as a result of combustion is used to do work on the piston—which pushes the piston down—increasing the volume of the chamber. This is also known as the power stoke because it is when the thermal energy is turned into motion to power the machine or vehicle.
Which is better 2 stroke or 4 stroke?
Because 2-stroke engines are designed to run at a higher RPM, they also tend to wear out faster; a
4-stroke engine
is generally more durable. That being said, 2-stroke engines are more powerful. … Two-stroke engines require pre-mixing of oil and fuel, while the 4-strokes do not.
What is the difference between 4-stroke engine and 2 stroke engine?
In a 2-stroke engine, all five functions of the cycle are completed in only two strokes of the piston (or one revolution of the crankshaft). In a 4-stroke engine, the five functions require
four strokes
of the piston (or two revolutions of the crankshaft).
What are the advantages and disadvantages of a 4 stroke engine?
More fuel efficiency :- 4 stroke engines have greater fuel efficiency than 2 stroke ones because fuel is consumed once every 4 strokes.
Less pollution
:- As power is generated once every 4 strokes & also as no oil or lubricant is added to the fuel; 4 stroke engine produces less pollution.
How much compression should a 4-stroke have?
What Outboard Compression Test Results Mean. Results vary depending on whether the outboard is a Four-Stroke or a Two-Stroke. Good results for Four-Strokes should be
180-210 PSI
, and Two-Strokes should be around 110-130 PSI. Here is everything that you need to know about outboard compression tests.
What is the function of 4 stroke engine?
4-stroke engines deliver a
good balance of power, reliability and efficiency
. When it comes to emissions, 4-strokes separate each event mechanically, which reduces unburned fuel emissions. It also separates oil from fuel, which significantly reduces carbon monoxide emissions.
How do I know if I have TDC compression stroke?
- Vacuum Pressure Gauge. Use a vacuum/pressure gauge. Hook up the gauge to your hose. Again turn the engine over by hand until you see pressure.
- Keep going until you see the pressure change to vacuum. Move on to STEP FOUR.
How many cylinders does a 4 stroke engine have?
A four-stroke cycle engine is an internal combustion engine that utilizes
four
distinct piston strokes (intake, compression, power, and exhaust) to complete one operating cycle. The piston make two complete passes in the cylinder to complete one operating cycle.
What is a stroke in engines?
A phase of the engine’s cycle
(e.g. compression stroke, exhaust stroke), during which the piston travels from top to bottom or vice versa. … The type of power cycle used by a piston engine (e.g. two-stroke engine, four-stroke engine).
Why thermal efficiency of 4-stroke engine is more than 2 stroke engine?
| 2 Stroke 4 Stroke | More power generation. Less power generation. | Produces more heat so it requires greater cooling and lubrication. Generates less heat. | Lower thermal efficiency Higher thermal efficiency |
|---|
Why is a 4-stroke engine more efficient?
4-Stroke Engines
4 stroke engines have a cycle of intake, compression, power, exhaust, which is a more efficient process, resulting in
a reduction in amount of fuel used to power the engine
and fuel lost from the exhaust.
Is 4 stroke fuel Unleaded?
4 stroke mowers
use just ordinary unleaded petrol
. 2 stroke mowers use a mix of ordinary unleaded petrol and a special oil. You have to mix them together using the right ratio. 2 stroke and 4 stroke mowers cost about the same to buy.
