MODERN ENGINE

TODAY‘S PETROL ENGINE WORKS on the same basic  principles as the first car engines of a century ago ,although it has been greatly refined. Modern engines,
often made from special metal alloys, are much lighter than earlier engines. Computerized ignition systems, fuel injectors, and multi-valve cylinder heads achieve a more efficient combustion of the fuel/air mixture (the charge) so that less fuel is wasted. As a resuh of this greater efficiency, the power and performance of a modern engine are increased, and the level of pollution in the exhaust gases is reduced. Exhaust pollution levels today are also lowered by the increasing use of special filters called catalytic converters, which absorb many exhaust pollutants. The need to produce ever more efflcient engines means that it can take up to seven years to develop a new engine for a family car, at a cost of many millions of pounds.