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It would be interesting to try putting only the secondaries at a distance, and make the staging point as high as you can. This would give you a nice cooling of the intake charge under full throttle ops, but maybe (key word) not hurt throttle response that much.
I don't think this helps charge density.
Indeed, by giving the fuel a chance to fully evaporate in the manifold you cool the air. The fuel vapor occupies much more space than the fuel droplets. Thus, the resultant cold air / fuel vapor combo is less dense than the warm air / fuel droplets combo.
By locating the injectors close to the engine, a good fraction of the fuel is still in the form of tiny droplets, which occupy much less space than fuel vapor. Thus, you end up with a greater charge density. At least this is the way I understand it to be.
Bill Dube'
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