Bio Fuels Forums - View Single Post

mr.damage · #14 (**permalink**) 31st May 2008, 10:53 PM

Quote:

Originally Posted by spudseamus

thanks for that --ill give them a ring just in case--- i see you run bio in a cdi volks-- my son had a golf 2007 he was askin how you find the bio goes in a commom rail engin?

It goes great on it but the Polo is not a common rail engine it is a Pumpe-Düse (pump injectors).

Volkswagen's Pumpe Duse or pump injectors also use a computer controlled electric solenoid to control injector opening and duration but there the similarity stops. Instead of one high pressure pump for the fuel system, each Pumpe Duse injector is its own high pressure pump.
Fuel is supplied to each Pumpe Duse injector from a low pressure fuel pump and lines. A camshaft and rocker arms on the cylinder head operate a plunger with return spring on the top of the injector body that produce the high fuel pressure. This high pressure fuel is then injected, with injection controlled by the computer.
One of the advantages the Pumpe Duse injection system has the high pressure it operates at. With up to 30,000 PSI injection pressure, considerably higher than common rail systems, the Pumpe Duse injector provides finer atomisation of the fuel for high torque and power with low emissions and high fuel efficiency. The Pumpe Duse diesels are capable of converting up to 43 per cent of the thermal energy in the fuel into mechanical energy. This is better than for any other liquid-fuelled production car.

Link to full artical explaining P-D

CanadianDriver: Auto Tech - Pumpe Duse