Neil Powell said: (quoted from post at 23:33:23 03/14/10) Trying to understand how diesel injection systems and Jake brakes work. I understand that the Jake brake works by opening the exhaust valve at the top of the compression stroke. I also understand they typically actuate the exhuast valve from the injector cam that fires the injector.
Due to my poor understanding of diesel fuel systems, what I don't understand is why there is a cam to fire the injector at all. I thought a conventional diesel injection system had a pump with a separate unit for each injector, and each injector just acts like a pressure relief valve when the injection pump pressurizes the line. So, I don't understand why the engine needs a lobe on the camshaft for each injector or what this cam lobe would do.
Can anyone explain or point me to a site that would explain?
Thanks,
Neil
They are not universal. There are separate pump injector types, cam operated types, hydraulic, and hyd/electric, and etc. Pretty much gotta home in on a specific engine & model & year even in some cases.
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