02-12-2013, 03:55 PM
If it's a *25tds it's a VP37 pump, which is just a VE (same as the 306 Bosch) pump with an electronic lid and electronic timing control - they're Indirect Injection so it'll have pintle nozzles which are of relatively little restriction usually ~175-200bar break - unlike VCO DI nozzles which are 220bar+. With Indirects you can get away with insanely long injection lengths in comparison to DIs, which means more revs!
The V6 TDis had a VP44 injection system, which is more similar to the Lucas CAV pumps in operation with a cam ring, but it's still a distributor pump - not CR or UI... Just means that the VP44s could cope with higher break pressure injectors than the VP37s could. The VP44 is a radial distributor pump, the VP37 is an Axial distributor pump...
It's just that the VP44 is known to be one of the most unreliable injection pumps ever!
The V6 TDis had a VP44 injection system, which is more similar to the Lucas CAV pumps in operation with a cam ring, but it's still a distributor pump - not CR or UI... Just means that the VP44s could cope with higher break pressure injectors than the VP37s could. The VP44 is a radial distributor pump, the VP37 is an Axial distributor pump...
It's just that the VP44 is known to be one of the most unreliable injection pumps ever!