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I've heard of SAE formula 1 design where they had injectors pointed up the runner towards the plenum. The idea was to have a better AF mixture. I've heard they were a bear to start, but this could be overcome with a second set of injectors that point down the runner to the intake valve, like a typical setup and then possibly wait until the engine reaches closed loop operating conditions.
I'd imagine the runner velocities would need to be sufficiently high at slower engine speeds.
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