Valve positions in a 1,2,4,3 firing order- paul-ryan.info Valves closed aspiston rises oncompression stroke. Exhaust valve openas piston rises onexhaust stroke. Valves closedas pistondescends onpower stroke. Inlet valve open aspiston descends oninduction stroke.
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The engine - how power is created

The conversion of fuel energy into power in an engine starts when petrol is mixed with air in a d...