I'm very happy with how this turned out. The new muffler doubles as an improved stand for the pump, and the total project added less than half a pound (~200 grams) to the weight of the pump.
To clarify the title, the measured sound at idle with the stock exhaust pointed at the camera at 12ft was 73dB, and after my modifications the measurement was 63dB. Measurements were taken with an app on my Samsung S22 Ultra that I used to film the video. Baseline sound measured in my backyard was 49dB.
At idle, and lower RPM, it seems most of the noise comes from the exhaust. My muffler was very effective at silencing this noise. However, at full throttle, a fair bit of the noise seems to be coming from mechanical engine noises from the air cooled engine, and so the drop in sound was less noticeable. I usually run my highbanker with this pump at less than 50% throttle, and so the improvements will be noticeable. Ahh the serenity :)
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Негізгі бет How I made my Honda WX15 Water Pump 10dB Quieter.
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