JD: Your posting prompted me to compile a doc describing how the DB2 works. Feel free to critique and revise the following information which is based in part on your research and my own.

We could combine this information with yours if you'd like, so it could be used in the reference section. If any members have images that could be used to enhance the information that JD and I have put together, it would be really appreciated.

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How the Stanadyne DB2 Pump Works

The Stanadyne DB2 rotary distributor pump has a single pumping element that feeds all injectors. The high pressure pumping action is carried out in a single barrel, which houses two opposing plungers operated by two rollers. These plungers are pushed together by a cam ring with internal lobes acting on the rollers and it is this action that pressurizes the fuel.

The number of lobes on the cam ring corresponds to the number of cylinders in the engine, so each thrust of the plungers by a pair of cam lobes results in a pulse of fuel to one particular cylinder injector.

The injection pump controls fuel delivery by: