Diesel fuel compresses slightly under high pressure. The longer the line, the longer it takes for the injection pulse created at the pump, to make it out the injector nozzle. Thus the reason for keeping all lines same-length (or close). If you shortened all your lines, firing time would be slightly advanced equally. If you shortened only one line, timing would be advanced on one cylinder only.
Length of lines certainly does make a difference. Injection systems gets "injection lag." That is the time difference between when the pressure spike is created at the pump . . . and when injection actually takes place in the engines combustion chamber (or pre-combustion chamber).
When an engine is designed, injection-lag is taken into account and the pump timing specs allow for it. Some makers give you timing specs to be checked AT the pump, while others IN the combustion chamber.
All this is why there is big difference in timing specs if using a diesel line-pulse timing light instead of a luminosity sensor. The former measures injection BEFORE the injector, and the latter measures AT the time of injection. There is often a difference of 3-4 pump degrees (that"s 6-8 engine degrees for a 1/2 engine speed rotary pump).
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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