Fuel Atomisation

[Arnaud Westenberg]

Greg Hermann wrote:

 >> 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?

 > Most port EFI designs deliberately injects the fuel onto the back side
 > of the _closed_ intake valves (or somewhere in that vicinity, if they
 > are lucky) at a point in time when there is little, if any, air
 > velocity in the port.

Thanks.
I forgot that in the carb case there's no fuel flow when there's no air 
flow, maybe I shouldn't have taken that last beer yesterday.  :-)

Are there any special provisions needed to squirt during valve open and 
still obtain adequate (whatever that may be) vaporization? Obviously, 
certain pulse widths would be too long to be able to spray during valve 
open, but what are the differences between timed sefi and batch efi/tbi, 
wrt the vaporization issue?

___

Arnaud

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