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4-stroke [2009/02/24 21:44] Admin created |
4-stroke [2009/05/11 18:51] (current) Admin |
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| The operation is as follows – | The operation is as follows – | ||
| - | • Intake Stroke – The inlet valve is opened and the fuel/air mixture is drawn in as the piston travels down. | + | * Intake Stroke – The inlet valve is opened and the fuel/air mixture is drawn in as the piston travels down. |
| - | + | * Compression Stroke – The inlet valve is closed and the piston travels back up the cylinder compressing the fuel/air mixture. | |
| - | • Compression Stroke – The inlet valve is closed and the piston travels back up the cylinder compressing the fuel/air mixture. | + | * Just before piston reaches the top of its compression stroke a spark plug emits a spark to combust the fuel/air mixture. The number of degrees before the top its stroke is the ignition advance. |
| - | + | * When the piston is at the top of its travel it is at ‘top dead centre' (TDC). | |
| - | Just before piston reaches the top of its compression stroke a spark plug emits a spark to combust the fuel/air mixture. The number of degrees before the top its stroke is the ignition advance. | + | * Combustion Stroke – The piston is now forced down by the pressure wave of the combustion of the fuel air mixture. The engines power is derived from this stroke. |
| - | + | * Exhaust Stroke – The exhaust valve is opened and the piston travels back up expelling the exhaust gases through the exhaust valve. At the top of this stroke the exhaust valve is closed. | |
| - | When the piston is at the top of its travel it is at ‘top dead centre' (TDC). | + | |
| - | + | ||
| - | • Combustion Stroke – The piston is now forced down by the pressure wave of the combustion of the fuel air mixture. The engines power is derived from this stroke. | + | |
| - | + | ||
| - | • Exhaust Stroke – The exhaust valve is opened and the piston travels back up expelling the exhaust gases through the exhaust valve. At the top of this stroke the exhaust valve is closed. | + | |
| This process is then repeated. | This process is then repeated. | ||
