Thursday, Aug 03, 2006 at 07:47
Well... just have a look at it and look how it is connected to the ECU..........
and, for good measure, here is the Nissan blurb on that engine... I would definitely not mess with the system based on the advice of a bush mechanic:
The measures adopted to accomplish M-Fire combustion include:
optimisation of fuel injection timing;
application of heavy exhaust gas recirculation (EGR); and
generation of strong fuel swirl.
In diesel engines, fuel has traditionally been injected at a point considerably before the piston reaches top dead centre (TDC) of the compression stroke.
In the ZD3O engine, the injection timing has been changed so that the fuel is injected closer to TDC of the stroke, allowing compressed air to enter the expansion stroke, thus combustion occurs after the pressure has started to drop meaning lower pressure at the onset of combustion.
As
well, injecting fuel at this point allows ample time for fuel to evaporate — because it is not ignited immediately after being injected — making it possible to accomplish premixed combustion.
In designing the ZD3O engine, Nissan engineers substantially increased the Exhaust Gas Recirculation (EGR) rate. This results in a gradual combustion process in which the mixture does not burn instantaneously following ignition which keeps the combustion temperature from rising.
And a newly-developed helical port is used to generate strong swirl motion to improve mixture formation and promote stable combustion.
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