Graham King Posted September 19, 2003 Share Posted September 19, 2003 As a future high mileage motorist I am having to look into buying a diesel tintop, I am looking towards the Golf TDI's. Can anyone explain for me what a "Common Rail Diesel" is and how Volkswagons "Pompe Douce"? (PD) system differs from it. This is out of interest and also trying to work out if Volkswagon's system is the future or just different from everyone elses. Thanks for any info available. Graham. R7 GPK Link to comment Share on other sites More sharing options...
dino ferrana Posted September 19, 2003 Share Posted September 19, 2003 Someone did an article on just this recently I think it was Autocar. I think the VW system has the injectors as an integral part of the head or something. Only VW use this type of technology and they want to stick with it. There are many arguements for and against. Basically there is no definitive answer on it I believe! Link to comment Share on other sites More sharing options...
Graham Perry Posted September 19, 2003 Share Posted September 19, 2003 It was autocar,a few weeks ago they explained it very well from what I recall. Unfortunately I can't remember enough about PD to explain exactly how it works, but it does seem to to be technologically in a different direction to which all the other manufacturers have gone. ie they have electrically triggered injectors where the VW PD system does not Link to comment Share on other sites More sharing options...
deanteam Posted September 19, 2003 Share Posted September 19, 2003 With the PD system check the cost of oil, supply and service. Link to comment Share on other sites More sharing options...
Cooper nut Posted September 19, 2003 Share Posted September 19, 2003 I believe that the common rail diesel engines inject under a higher pressure to standard diesel engines which gives a cleaner and more efficient burnt You're only suppose to blow the blo*dy doors off Link to comment Share on other sites More sharing options...
ChrisC Posted September 19, 2003 Share Posted September 19, 2003 Its all about to change again with EU2005 directive, got to get even cleaner PD of not Chris.... H15 SVN Get it ! Link to comment Share on other sites More sharing options...
Bob Corb Posted September 19, 2003 Share Posted September 19, 2003 PD uses a low pressure lift pump to provide oil to the "pump nozzle" this has a combination of a mechanical drive from the camshaft to provide a high pressure and a solonoid to open the nozzle at the right point. This gives very high pressure at the nozzle but slightly restricts the degree of accuracy with regard to pre injection (can do three staged injections). Common rail has a high pressure pump which fills a common fuel rail at high pressure feeding all the injectors. The injectors are electronically triggered. Not such high pressure but greater control over injection (can do 6 staged injections). Therefore PD is compact and simple, common rail is quieter as the greater control over injection gives less of a diesel "knock". Not all VWs use PD. The V6 engine is common rail. Bob Link to comment Share on other sites More sharing options...
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