Re:Re:Show us your homemade Test Equipment

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2 years 10 months ago #48749 by Matt T

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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2 years 10 months ago #48751 by juergen.scholl
Your correct!

An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.

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2 years 10 months ago #48752 by Matt T

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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2 years 10 months ago #48753 by Wightscope
I'll be more careful about my casual examples next time !

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2 years 9 months ago #49352 by Ben
Alright got another 1 today with the chassis ear on a diesel injector and a pulse sensor in the radiator . This 1 happens to be on my poor severely overheated lawn mower.....

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2 years 9 months ago #49353 by Ben
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2 years 9 months ago #49354 by Ben
The sync is on injector #2 I'm not sure what degree they fire in relations to crank angle so I just marked the peak pressure and divided( I measured 180 degrees from pulse to peak but I believe this is direct inject and not above the intake valve?)

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2 years 9 months ago #49355 by Ben
Setup

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2 years 9 months ago #49407 by Noah
Is it stupid that I'm impressed by your commercial grade lawn mower?

"Ground cannot be checked with a 10mm socket"

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