Jim Cathey wrote: > I am told that a surprising amount of the diesel's noise is > due to the Bosch inline pump. I test-drove an older Dodge diesel > (for a fellow lister) once that had a rotary pump in it, and it > was noticeably quieter than mine, which has an inline P7100. > The pump on a test stand is supposed to make quite a racket.
That would explain why the VW diesel I used to own was noticeably quieter than my Mercedes diesel, once I put good injectors in it. VW diesels used the Bosch VE rotary pump. It would be interesting to take a mechanic's stethoscope and listen to the pump.
