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Jon and V Boat Conversions & Modifications
Alumacraft 1436 Engine Harmonic Resonance at 3/4 throttle
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<blockquote data-quote="DaleH" data-source="post: 488427" data-attributes="member: 15636"><p>The harmonic is typically set at an RPM that the engine doesn't run at, but just transitions through. On larger OBs it's usually in the low 2K range as boats typically start planning or stay on plane from 2,500 to above 2,800 or so. At least that's where it was when I was in the engine bizness ...</p><p></p><p>Not sure 2-strokes use dynamic harmonic balancers, but maybe that's used on newer 4-stroke technology.</p></blockquote><p></p>
[QUOTE="DaleH, post: 488427, member: 15636"] The harmonic is typically set at an RPM that the engine doesn't run at, but just transitions through. On larger OBs it's usually in the low 2K range as boats typically start planning or stay on plane from 2,500 to above 2,800 or so. At least that's where it was when I was in the engine bizness ... Not sure 2-strokes use dynamic harmonic balancers, but maybe that's used on newer 4-stroke technology. [/QUOTE]
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Jon and V Boat Conversions & Modifications
Alumacraft 1436 Engine Harmonic Resonance at 3/4 throttle
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