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Tractor Talk Discussion Forum

Using a Sirometer

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Gene Davis (Ga.

11-18-2005 16:09:54




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Has anybody out there use a Sirometer, aka vibrating wire tachometer? It is manufactured in Germany for Briggs & Stratton. I got one for checking engine speeds with and the directions are in 4 languages, but are very vague. Directions say to hold it on the item being checked and to extend the wire till it is moving at the same frequency with the machine. How do you tell that? Do you extend or retract the wire to the maxium oscillation point, or is there some other way of telling when it is at the correct frequency of vibration. Kinda lost on this one. Gene Davis

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Gene Davis (Ga.)

11-20-2005 19:06:26




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 Re: Using a Sirometer in reply to Gene Davis (Ga.), 11-18-2005 16:09:54  
Thanks for the wisdom guys!



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JT

11-19-2005 05:52:27




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 Re: Using a Sirometer in reply to Gene Davis (Ga.), 11-18-2005 16:09:54  
Gene,
If you will put it on a peice of equipment, turn the dial out until the wire is vibrating in its widest sweep, you have your RPM, you can turn it in and out and it will vary on the sweep of the wire, but after a while you see the siromic vibration you will get, once you have a handle on that, it is the most accurate tach for small engines on the market other than a digital tach.



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mhmalcolm

11-19-2005 03:45:47




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 Re: Using a Sirometer in reply to Gene Davis (Ga.), 11-18-2005 16:09:54  
It is very simple to use. When you have the unit placed on the engine, dial out the wire reed until it starts vibrating. Keep dialing it out until the sweep of the reed is at it's widest arc and then starts to reduce. Dial back to the widest arc and read the dial. That reading will be your true RPM. These are very accurate once you master the technique.



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RAB

11-19-2005 00:24:24




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 Re: Using a Sirometer in reply to Gene Davis (Ga.), 11-18-2005 16:09:54  
I have one of those devices. But not that make I would think. Very old tech. Mine was given to me about twenty years ago by an uncle who used to work on turbines in his past life. I think it may have been used about 50 years ago! I just keep mine as an antique to demonstrate to the modern kid that "in them days they relied on mechanicals, as electronics didn"t exist". I think that harmonics and other vibrations might be a problem with some readings, so needs a little brain power to understand and interpret sensibly, not like the simple digi read-out from a modern tacho.
Regards, RAB

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doogdoog

11-18-2005 20:46:47




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 Re: Using a Sirometer in reply to Gene Davis (Ga.), 11-18-2005 16:09:54  
Aloha, After reading your posting again, I think that the link has the same instruction that you must have. How far does the wire come out?? It seems that while you have the meter on the engine, you have to let the wire out until it starts to vibrate and when that happens, you take your reading. Try it on a know rpm machine first.

Mahalo,
doogdoog



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doogdoog

11-18-2005 20:22:31




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 Re: Using a Sirometer in reply to Gene Davis (Ga.), 11-18-2005 16:09:54  
Aloha, I will try to post a link to the Sirometer instructions. Hope it comes out.

Mahalo,
doogdoog



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