Fuel Atomisation

[Arnaud Westenberg]

Greg Hermann wrote:

 >> So what you are saying is that carbs (I guess not all) have better
 >> atomisation than port injection? and consequently lower BSFC? (As a
 >> generalised statement - feel free to go into much detail).

 > Squirting fuel on the back side of a closed intake valve (as some
 > port injectors do) so as to vaporize it (to make up for the lack of
 >  good atomization) hurts both volumetric AND thermal efficiency.

 > The trick here is to have as much of the _vaporization_ (as opposed
 > to atomization) take place _after_ the intake valve has _closed_ .

I don't get it. How come the atomized fuel from the carb doesn't 
evaporate until it is in the cylinder, but that from a (port) injector 
evaporates at the valve? Can't be just from the higher fuel temp in the 
injector case, or is it?

___

Arnaud

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