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Hi ,hope i'm not too late to help.They don't inject into the combustion chamber mainly because the fuel& air takes time to mix-not good for an f1 engine .this is why diesel engines don't rev very high.I think i also read somewhere that direct inj. is banned in f1 for cost reasons.The inlet trumpets are shaped to accelerate the air into the engine with minimum loss& also work with the stop start harmonics of the incoming air to 'jam more in'-a simplistic way of putting it.(longer/narrower suits low revs,shorter/wider suits higher revs).A similar effect occurs in the exaust system.hope this is not too basic
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