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Humming sound after startup
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<blockquote data-quote="Virtual1" data-source="post: 24636" data-attributes="member: 4084"><p>That would be my guess. The fans may simply get a bit noisy when cold due to thermal contraction in the bearings or other areas of the cooling fan. Or the fan may be off balance. I don't know if the internal fan is variable-speed (one would hope so), and fans can have "sweet spots" where they hit a harmonic of vibration and get noisy when running at certain RPMs. Being cold outside may cause the fan to slow down because the spark doesn't need cooling, and that is dropping it into an RPM range where it starts to vibrate.</p></blockquote><p></p>
[QUOTE="Virtual1, post: 24636, member: 4084"] That would be my guess. The fans may simply get a bit noisy when cold due to thermal contraction in the bearings or other areas of the cooling fan. Or the fan may be off balance. I don't know if the internal fan is variable-speed (one would hope so), and fans can have "sweet spots" where they hit a harmonic of vibration and get noisy when running at certain RPMs. Being cold outside may cause the fan to slow down because the spark doesn't need cooling, and that is dropping it into an RPM range where it starts to vibrate. [/QUOTE]
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Humming sound after startup