"Michael D. Callahan" wrote:

    Jim's right, for the upstream injector setup to work correctly it should
not make any turns, especially in a round intake runner, as it will cause
fuel to adhere to the outside of the runner and defeat the purpose of
injecting it upstream to begin with. Making the runner oval shaped would
help the situation as would leaving the inside surface slightly rough in
order to energize the boundary layer a bit and keep things stirred up.

    I plan to leave one set of injectors on the housing, though for
go-arounds. You'll never get instant throttle response with everything
travelling that far. Another bit I overheard at OSH was that the F1(auto
racing) setups have two complete sets of injectors, one at the ports and one
way upstream. If the driver stabs the throttle, the computer fires the port
injectors until the engine catches up and then switches to the upper set for
peak power and economy.

 
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