how does the common rail differ from my old p7100 on my 12V?

[shendren]

thanks. scott.

 

[rbattelle]

The short answer is, a lot.



Basically, in a common rail system the injector pump provides steady pressure to a fuel reservoir and electronically-controlled injectors with on-board solenoids provide fuel to each cylinder on-demand.



If you are really interested in this, I suggest any of the myriad technical texts available on the subject of the intermittent combustion engine, with particular emphasis on modern diesel fuel injection systems. Personally, I like Charles Fayette Taylor's 2-volume work, "The Internal Combustion Engine in Theory and Practice", although I caution you that his description of common-rail systems is somewhat dated, and must be updated by the reader.

 

[Jim Fulmer]

I love my 7100 but the common rail is just way cool, look at the high HP gasser guys, this is what they use except they have a laptop controlling fueling and timing of each cyl on it's own.



I got to see a guy lay down 530 or 540 area (can't remember) at May Madness with only a TST box and a PDR40 and a puff of smoke... ... that was impressive.



Jim

 

[TxDieselKid]

Originally posted by Jim Fulmer

I love my 7100 but the common rail is just way cool, look at the high HP gasser guys, this is what they use except they have a laptop controlling fueling and timing of each cyl on it's own.

Things will be intresting in the future won't they?

 

[rbattelle]

I think one of the biggest advantages of the common rail arrangement over jerk pump counterparts is simplicity. You have a very simple pump (just 3 radial pumping chambers and absolutely no need to time it) that supplies fuel to a large reservoir, then individual injectors are fired using a simple piezoelectric solenoid. Very simple; much fewer moving parts than a comparable jerk pump (to me, part count - especially moving part count - defines simplicity).



The down side, of course, lies in susceptibility to damage from small contaminants in the fuel system.



-Ryan

 

[Joseph Donnelly]

See TDR #35, p. 20, #42, p. 26.