Originally Posted by
yr right
The reason for a carby preformance is it better atomises the fuel into the whole volume of intake air.
There is no basis in fact for this claim. The only advantage it might have is when the carb is positioned way upstream giving the fuel more time and surface area for vaporization. On F1 engines in the past, the injector was placed at the inlet bellmouth entry for this very reason. Of course it doesn't come without penalty, which is increased air-fuel ratio excursions during transient operation.
Most phased port injection systems are injecting on the back of a closed inlet valve - immediately after valve closing for sequential systems - so a large part of mixture preparation is by evaporation.
Originally Posted by
yr right
It the hymomics of the desiel that's the worry for me.
You worry about some strange and irrelevant stuff...