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Air-cooled engine tuning

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Clark Greene

03-01-2001 04:28:47




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Many years ago, my grandfather had a tool that he used to tune up air cooled engines. It was about the size of a ball-point pen and consisted of a sliding rod with a small weight. I think you set the lenght of the rod/weight according to the number of cylinders on the engine. When the tuner was held against the engine it would vibrate wildly until the engine rpm, point gap, carbuerator setting, etc. were all correct. Anybody out there know anything about this device?

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Al English

03-02-2001 11:09:04




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 Re: air-cooled engine tuning in reply to Clark Greene, 03-01-2001 04:28:47  
I saw a generator with a device that works on the same principal. Its purpose was to allow the engine speed to be adjusted so the output would be 60 cycles(more or less)...Al English



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I know it almost all

03-01-2001 04:56:25




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 Re: air-cooled engine tuning in reply to Clark Greene, 03-01-2001 04:28:47  
Clarke - Thats a vibrating tachometer. It doesn't tell anything about the state of tune of the engine, just rpm's. I think you can still get them today, perhaps from some small engine mail order catalog.



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RayP(MI)

03-05-2001 18:47:16




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 Re: Re: air-cooled engine tuning in reply to I know it almost all, 03-01-2001 04:56:25  
You're right on - I have one given to me by a friend, (origional source unknown). They are suprisingly accurate - I compared one to an electronic frequency meter that I use in two-way radio communication and it was very close. Mine's about the size of a snuff can. For generators there is also a frequency meter with several vibrating reeds, tuned in 2Hz increments,
the reed vibrating the greatest amplitude is the frequency, if two vibrate, frequency is between them. This is electrically driven off the generator output.

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Bus Driver

03-02-2001 09:42:51




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 Re: Re: air-cooled engine tuning in reply to I know it almost all, 03-01-2001 04:56:25  
The official name of the "vibrating tachometer" is "Sirometer".



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Yoda

03-01-2001 18:02:08




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 Re: Re: air-cooled engine tuning in reply to I know it almost all, 03-01-2001 04:56:25  
He was correct about the Tach tool. If you want to tune up your air-cooled engine just clean the filter,change the oil and replace the spark plug.If the motor is missing it may be bad gas or dirt in the carb. If the motor has many hours on it you may consider a valve job and new rings this does wonders.A dirty filter or dirt in the carb can really effect its performance. Good luck



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