Re:Re:Show us your homemade Test Equipment
juergen.scholl wrote:
Wightscope wrote: So at 1200rpm a sound at 10Hz is going to be valvetrain as the cams rotate at half the speed of the crankshaft, or maybe an idler pulley bearing - if it is 2/3rds of the size of the crank pulley will make a noise at 13.3Hz
The frequency in your example would be 15 hertz, not 13.3.
An idler pulley that is 2/3 the effective diameter of the crank pulley will be rotating 50% faster. Crank is at 20Hz in the example so idler will be 30Hz if the noise only happens once per idler revolution. More likely to be a higher frequency bearing noise though.
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juergen.scholl wrote: Your correct!
I think you could've been correct too if Wightscope hadn't tricked you into using camshaft frequency.
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