HOW IT WORK ENGINE FOUR STROKE
Well on the second post I outline a discussion of how the four-stroke engine as well as the advantages and disadvantages of using this type of engines, what? of course, this article is pure outpouring of ideas from the author by citing some parts of the picture that the author of textbooks teach students in the author taught writer, please read my article, if you want to copy your postingkan never again in your website / blog because it's called 'THEFT IDE'.
As mentioned in the introduction, engines four steps require two crankshaft rotations (4 piston movement) to complete the first cycle in the cylinder. Some examples of the motorcycle engine that uses four step (I only take an example, not intended for the promotion of goods or the like) which may only be marketed in Indonesia as follows:
- Suzuki Shogun
- Honda CG
- Honda GL
- Honda GL Max
- Yamaha Vega
As mentioned in the introduction, engines four steps require two crankshaft rotations (4 piston movement) to complete the first cycle in the cylinder. Some examples of the motorcycle engine that uses four step (I only take an example, not intended for the promotion of goods or the like) which may only be marketed in Indonesia as follows:
- Suzuki Shogun
- Honda CG
- Honda GL
- Honda GL Max
- Yamaha Vega
- Suzuki Thunder
- Honda Supra XX
- Honda Nova Sonic125 RX
- Honda New Sonic
- Honda Legend
- Honda GL Pro
- Honda Tiger 2000
- Honda Supra X
General characteristics of the motorcycle four-stroke engine:
- Exhaust gas is colorless (unless there is damage)
- More fuel economical
- Using one lubricating oil to lubricate the space crank, pistons, cylinder walls and transmission
- Honda Supra XX
- Honda Nova Sonic125 RX
- Honda New Sonic
- Honda Legend
- Honda GL Pro
- Honda Tiger 2000
- Honda Supra X
General characteristics of the motorcycle four-stroke engine:
- Exhaust gas is colorless (unless there is damage)
- More fuel economical
- Using one lubricating oil to lubricate the space crank, pistons, cylinder walls and transmission
Advantages And Disadvantages Engine four steps
a. Advantages engines four steps:
• Since the entry process, compression, labor, and waste stand-alone process that is more precise, efficient and stable, rotation distance from low to high over wide (500 - 10000 rpm).
• Losses due to back pressure step smaller than two stroke engines that use fuel more saving.
• Low round better and more engines heat can cooled by circulating oil
• Step intake and exhaust longer so intake efficiency and pressure efektive average better
• The heat engines is lower than the two-cycle engine
b. Losses engines four steps:
• Components and more valve motion mechanism, so that treatment more difficult
• The sound is more mechanical noise
• Step 2 rotation of work going on with the crank shaft, so Swivel equilibrium is unstable, need more than the number of cylinders one and as a vibration absorbers.
a. Advantages engines four steps:
• Since the entry process, compression, labor, and waste stand-alone process that is more precise, efficient and stable, rotation distance from low to high over wide (500 - 10000 rpm).
• Losses due to back pressure step smaller than two stroke engines that use fuel more saving.
• Low round better and more engines heat can cooled by circulating oil
• Step intake and exhaust longer so intake efficiency and pressure efektive average better
• The heat engines is lower than the two-cycle engine
b. Losses engines four steps:
• Components and more valve motion mechanism, so that treatment more difficult
• The sound is more mechanical noise
• Step 2 rotation of work going on with the crank shaft, so Swivel equilibrium is unstable, need more than the number of cylinders one and as a vibration absorbers.
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| Figure 1. wedge four-stroke motorcycle engines cross section |
As mentioned in the introduction, four stroke engines require two crankshaft rotations (4 piston movement) to complete one cycle in the cylinder. For more details, see the explanation below:
How to work four-stroke engine
1. process:
Intake stroke (suction stroke)
• Valves entrance open, the exhaust valve is closed
• Piston moves from TDC to BDC
Step Explanation:
As the piston moves downward pressure combustion diruang be empty (vacuum). The difference in air pressure outside the high vacuum pressure, making the air will flow and mix with of gas. Furthermore, the gas through the open intake valve flow into the chamber cylinder.
Intake stroke (suction stroke)
• Valves entrance open, the exhaust valve is closed
• Piston moves from TDC to BDC
Step Explanation:
As the piston moves downward pressure combustion diruang be empty (vacuum). The difference in air pressure outside the high vacuum pressure, making the air will flow and mix with of gas. Furthermore, the gas through the open intake valve flow into the chamber cylinder.
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| Figure 2. Intake Stroke |
2. Process:
Compression stroke (compression stroke)
• Valve incoming and exhaust valves closed
• Piston moves from BDC to TDC
Step Explanation:
After charging, the piston has reached BDC back again moves toward TDC, the room is far above the piston, so that the air-fuel mixture becomes solid, the pressure and temperature rise. The pressure rose approximately threefold. A few degrees before the piston reaches TDC occurs expose electrical spark from the spark plug to burn the fuel-air mixture. As the piston moves upward, closed intake valve and at the same time exhaust valve is also closed. The mixture in the combustion chamber at TDC compressing up, thus easily ignited and burn rapidly.
Compression stroke (compression stroke)
• Valve incoming and exhaust valves closed
• Piston moves from BDC to TDC
Step Explanation:
After charging, the piston has reached BDC back again moves toward TDC, the room is far above the piston, so that the air-fuel mixture becomes solid, the pressure and temperature rise. The pressure rose approximately threefold. A few degrees before the piston reaches TDC occurs expose electrical spark from the spark plug to burn the fuel-air mixture. As the piston moves upward, closed intake valve and at the same time exhaust valve is also closed. The mixture in the combustion chamber at TDC compressing up, thus easily ignited and burn rapidly.
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| Figure 3. Compression Stroke |
3.Step work
(explosion / power stroke)
• Valve incoming and exhaust valves are still closed
• Piston moves from TDC to BDC
Step Explanation:
The mixture burns very quickly, causing the combustion process gas mixture expands and expands, and the heat energy produced by combustion in the combustion chamber creates a pressure in all directions and combustion pressure pushes the piston down (TMB), then rotate the crankshaft through the connecting rod
(explosion / power stroke)
• Valve incoming and exhaust valves are still closed
• Piston moves from TDC to BDC
Step Explanation:
The mixture burns very quickly, causing the combustion process gas mixture expands and expands, and the heat energy produced by combustion in the combustion chamber creates a pressure in all directions and combustion pressure pushes the piston down (TMB), then rotate the crankshaft through the connecting rod
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| Figure 4. Power Stroke |
4. Process:
Step exhaust (exhaust stroke)
• Valve closed entry
• Kaktup open flue
• Piston moves from BDC to TDC
Her step explanation:
Before the piston moves down to the TMB, the valve opens and gas expenses combustion flowing out. When the piston begins to rise from the BDC, the piston pushing combustion gases are still left out through the exhaust valve and exhaust into the atmosphere. Once the piston down from TDC start spending valve is closed and the mixture begins to flow into the cylinder.
Step exhaust (exhaust stroke)
• Valve closed entry
• Kaktup open flue
• Piston moves from BDC to TDC
Her step explanation:
Before the piston moves down to the TMB, the valve opens and gas expenses combustion flowing out. When the piston begins to rise from the BDC, the piston pushing combustion gases are still left out through the exhaust valve and exhaust into the atmosphere. Once the piston down from TDC start spending valve is closed and the mixture begins to flow into the cylinder.
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| Figure 5. Exhaust Stroke |
When the valve opening and closing the income and expenses associated with the position of the piston is called "valve timing"
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| Figure 6. Valve Timing Diagrams |
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