Posts: 1996
Location: Pelican Lake/Three Lakes Chain | I must have missed the part where you said "for a two stroke" in your first statement, and not to be a naysayer, but actual testing doesn't agree with your Verado is the quietest statement at any of the RPM or Cruising speed.
Powerboat Reports has published test results comparing six different 150-HP engines:
Four-Stroke
Mercury Verado 150
Suzuki DF150
Yamaha F150
Honda BF150
Two-Stroke
Mercury Optimax 150
Evinrude E-TEC 150
In terms of sound at idle speed of 1,000-RPM, the quietest motors:
dB-SPL / Motor
63.5 -- Suzuki
64.0 -- Verado
65.5 -- Yamaha
66.5 -- Honda
69.0 -- E-TEC
72.0 -- Optimax
However, pump the speed up to 1,500-RPM, a typical No-Wake speed, and the order changes to
dB-SPL / Motor
70.0 -- Yamaha
70.5 -- Honda
71.0 -- Verado
71.5 -- Suzuki
75.0 -- E-TEC
79.0 -- Optimax
Jump ahead to cruising speed, and the order changes again. This time we are going to look at boat speed, not engine speed. This helps the two-strokes because they won't be running the engine quite as fast. Now the results are:
dB-SPL / Motor / MPH
84.0 -- E-TEC -- 29-MPH
84.0 -- Yamaha -- 27.9-MPH
84.5 -- Honda -- 27.6-MPH
87.0 -- Verado -- 27.8-MPH
89.5 -- OptiMax -- 27.7-MPH
90.5 -- Suzuki -- 30.3-MPH
At wide open throttle, the ranking changes some more. Again we compare at boat speed not engine speed:
dB-SPL / Motor / MPH
92.5 -- Honda -- 42.9-MPH
96.0 -- Verado --45.1-MPH
97.5 -- E-TEC -- 48.8-MPH
99.0 -- Suzuki -- 44.0-MPH
101.8 -- OptiMax -- 45.0-MPH
102.0 - Yamaha -- 45.3-MPH
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