Author Topic: info needed on 2.0 tdi's (Read 5455 times)

the4ork · « **on:** November 05, 2007, 10:02:09 pm »

these are common rail engines yes? so no mechanical fuel injector pump?
how is the fuel pump configured? just a high pressure electric pump?

and more important, are the blocks still cast iron?

jtanguay · « **Reply #1 on:** November 05, 2007, 11:00:01 pm »

some good questions... i think that there may be some 2.0 PD engines that came in passats, but from what i've heard, they are all CR.

AFAIK the common rail uses a high pressure electric pump to supply the 25'000 psi pressures. downside to this is if you have a leak anywhere, the whole system will suffer. (just need to be anal about maintenance i guess)

i'm going to guess that the blocks are cast iron, as an alloy block would get quite expensive... perhaps on an audi, but highly doubt it on a VW.

CR is pretty interesting... it is able to inject something around 100 times per millisecond? pretty crazy. they use pilot injection to start burning the diesel (a very small amount) so that when they introduce more diesel it starts burning more completely. VERY sophisticated stuff!

Tiz · « **Reply #2 on:** November 06, 2007, 03:34:07 am »

2.0 16v PD in my Seat leon reference sport.

jtanguay · « **Reply #3 on:** November 06, 2007, 10:37:05 am »

excellent! thanks for sharing

hmmmmm 2.0 16 valve... DIESEL!!! that thing must go :twisted:

Tiz · « **Reply #4 on:** November 06, 2007, 11:16:31 am »

oh yes it certainly does i absolutely love the car to bits. ITs quite a heavy car but jesus it lights that traction control light up all the time even in the dry.

Greasecar · « **Reply #5 on:** November 11, 2007, 08:11:47 am »

I have a 2.0l PD in my Passat. The PD is a unit injector system that has an electric pump in the tank that feeds fuel to the engine at 10-12psi. There is gear pump on the back of the cylinderhead that runs off the cam shaft and boosts up the fuel pressure into channels in the cylinderhead that feed each of the unit injectors. The injectors themselves produce the high pressure injection. They are like spring loaded syringes and are actuated by an overhead cam. Each injector also has a pulse modulated solenoid so that the ECM can fine tune the injections.

The new VW common rail engines that are being introduced in North America in 2008 will have a high pressure external rail similar to what is seen on Mercedes, CRD and late model Cummins engines along with piezo actuated injectors. Piezo crystals allow for more rapid and therefor more percise multiple injection control.