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write any essaysexplosion forces down the piston, so turning the crankshaft. The final phase of the operation is the stroke that expels the exhaust gases from the cylinder.

B Cylinder Head

The engine¡¯s cylinder block is invariably made of cast iron on to which is bolted an aluminium cylinder head. This contains the valves that permit the petrol-air mixture to enter the combustion chamber and the exhaust gases to leave it. These can be actuated by pushrods from a block-located crankshaft-driven camshaft, although the head more usually incorporates single or twin ¡°overhead¡± camshafts driven by a ribbed rubber belt.

C Fuel Injection

Fuel-Injection System The fuel-injection system replaces the carburettor in most new vehicles to provide a more efficient fuel-delivery system. Electronic sensors respond to varying engine speeds and driving conditions by changing the ratio of fuel to air. The sensors send a fine mist of fuel from the fuel supply through a fuel-injecti...