1200rallycar wrote
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the answer to that is no, the iris and roller style have a very large opening very quickly and therefor would not offer the fine control at low throttle
have you tried it? a large throttle body will offer better control at low throttle compared to the mentioned at the proportinate size for your engine if your foot does the same with both? I dont think your statement is correct.
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if your butterfly style throttle is too small for the application and therefore you are getting pressure drop... then do what everyone else is doing... put a bigger throttle body... or muck around knife edging it
Actually lack of air with a too small TB (reduces the volume of air) the idea Bakat put up focuses on air fuel in a vortex and centrally focused highly mixed/atomised fuel air path similar to what latest bike carbs and TBs seem to be designed to do.