butre
Well-Known Member
I measure as an audio engineer does, not as a race track does. that's one meter from the source at 45 degrees. 20 inches or 1 meter is close enough to give similar results with maybe a 1 decibel difference.
the overwhelming majority of the noise my bike makes is in those straight cut gears and I haven't found a good way to drop that noise by any considerable margin without adding bulk. thick grease helps, but not enough. if someone would make a set of helical gears for a china girl I'd be their first customer.
come to think of it, I haven't measured since I built that chamber, and I've added silicone dampers between the fins and quieted down the intake quite a bit since then.
the overwhelming majority of the noise my bike makes is in those straight cut gears and I haven't found a good way to drop that noise by any considerable margin without adding bulk. thick grease helps, but not enough. if someone would make a set of helical gears for a china girl I'd be their first customer.
come to think of it, I haven't measured since I built that chamber, and I've added silicone dampers between the fins and quieted down the intake quite a bit since then.
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