Posted by MoparNorm on Monday, September 04, 2006 at 10:27AM :
In Reply to: Monorail- and electronic injectors? nm posted by chriscase on Sunday, September 03, 2006 at 4:45PM :
In 2002 Cummins went to the CRD, common rail diesel. Higher pressure and the "pre" ignition actually takes place just before the cylinder. From the Bosch web site:
"The Common Rail system in particular gives engine developers the freedom they need to reduce exhaust emissions even further, and especially to lower engine noise. The particular design of Common Rail, with its flexible division of injection into several pre-, main and post-injections, allows the engine and the injection system to be matched to each other in the best possible way. In the Common Rail accumulator injection system, the generation of the injection pressure is separate from the injection itself. A high-pressure pump generates in an accumulator – the rail – a pressure of up to 1,600 bar (determined by the injection pressure setting in the engine control unit), independently of the engine speed and the quantity of fuel injected. The fuel is fed through rigid pipes to the injectors, which inject the correct amount of fuel in a fine spray into the combustion chambers. The Electronic Diesel Control (EDC) controls extremely precisely all the injection parameters – such as the pressure in the Rail and the timing and duration of injection – as well as performing other engine functions."
MN