This simple technology didn ’ t last . Turbodiesels were becoming increasingly popular everywhere in the car market , from small hatches to 4WDs . Diesel particulate emissions became more obvious a health problem in places such as Europe , and diesel emission standards increased in large markets such as the US and Europe . This pushed manufacturers to move to the cleaner-burning common rail injection systems .
COMMON RAIL INJECTION
The common rail diesel engine injects fuel at high pressures ( more than 2000bar ) and has much more electronics to make it all happen . The high-pressure fuel pump delivers diesel to a fuel rail ( the ‘ common rail ’ that gives these engines their name ), where the injectors draw fuel in precise amounts . Piezo-electric fuel injectors ( using tiny piezo crystals that expand with a small current applied to them ) provide a much quicker , precise injection of fuel than previous injectors .
This common rail design not only allowed manufacturers to meet the increasingly stringent emissions requirements , it made a big difference to performance and economy . The 4WDs could be built bigger and heavier , with no loss to performance , and for some , the same if not better economy .
Then the noose tightened for diesels , with emissions regulations ( overseas ) forcing the manufacturers to technology such as the diesel particulate filter . Suddenly , the humble diesel had become a very complex beast . Australia ’ s emission standards are based on the Euro 5 standard , with the government still reviewing if it ’ s going to adopt the cleaner Euro 6 standard that has been required in Europe since 2015 .