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Here we go again; speculation: My best guess is that they are to improve idle by reducing standing wave action.
With one carb per cylinder, there's a standing wave of fuel droplets in front of the carb at certain rpms--it's a length/ rpm tuning thing. (That's one of the functions of those "silencer" air boxes attached to the carbs; to contain this.) If you've seen that standing wave of fuel hanging in mid-air it's kinda scary; I mean, one good spark and....ka-boom!
My late and much mussed buddy Clint watched a big block Chevy running on a dyno with Hilborn injectors. There was a MASSIVE cloud of fuel droplets 18 inches high above each of the 8 injector pipes at certain rpms!
Jeff
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45ss does it getting on plane. will try balancing tubes soon.
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Here's another factory intake set up, this one from a Merc 90 triple. Note how deep those inter-cylinder passages are!
Jeff
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I removed the attentuator from my merc triple and every time I pull the cowl to wash it when I get home there a lot of fuel sitting in the lower cowling.
I was thinking about making up some venturi's for it ,do you reckon this would help?
other wise I was going to refit the attenuator back on.
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That's the standing wave of fuel droplets impacting on the cowl and settling.
Jeff