1. The ____ is the distance travelled by a piston from ____ dead centre to ____ dead centre. 2. In a four-stroke petrol engine the ____ valve opens allowing a mixture of ____ and ____ to enter the cylinder. 3. When the cylinder is full the ____ travels back up the cylinder ____ the mixture. 4. A ____ at the ____ then causes the mixture to explode, the expanding burning gases ____ the piston down. 5. After the explosion the cylinder is full of exhaust gas. This is then pushed out of the cylinder past the open ____ valve. 6. The spark plug sparks only ____ the crankshaft in a four-stroke cycle engine turns two complete revolutions. 7. The crankshaft has turned 720 degrees to complete its four strokes, the ____ turns 360 degrees.

OTTO - FOUR STROKE O.H.V. PETROL SI ENGINE

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