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Wisconsin Engines

Wisconsin AHH Setting Max RPM - Tachometer Recommendations?


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Old 02-08-2018, 09:08:08 PM
No Muffler No Muffler is offline
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Default Wisconsin AHH Setting Max RPM - Tachometer Recommendations?

Will be assembling two 1946 Wisconsin AHH thumpers soon. These are rated to operate at only 2200 rpm, so I want to be sure not to over-rev. Whatís a good, relatively inexpensive tachometer to use for this? Wonít use it often but want it to last. Recommendations appreciated.

Jeff G
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Old 02-08-2018, 09:34:46 PM
s100 s100 is offline
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Default Re: Wisconsin AHH setting max rpm- tachometer recommendations?

I have a couple of those old Stewart-Warner contact type tachometers. They work well but I can't recall their speed range. I think even 2200 rpm will cause the needle to make more than one complete turn so some cipherin' will be needed to know the actual speed. If I were to buy another tachometer I would get a stroboscope - ideally an old General Radio Strobotach.

But unless you will be using your engines under load why crowd the envelope? Run it up by ear something around 1800 and call it good.
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Old 02-08-2018, 09:55:23 PM
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Default Re: Wisconsin AHH setting max rpm- tachometer recommendations?

Thanks S100. I will use these at load- for pumping water for fire hoses to fight wildfire at a cabin in the forest. In that circumstance, Iíll use them for 1/2 hour- and for that 1/2 hour they need to pull at full load. Iíll check out the tachs you describe. There are inexpensive laser tachs on Amazon- only $20- I wonder how well they work.
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Old 02-09-2018, 12:43:30 AM
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Default Re: Wisconsin AHH Setting Max RPM - Tachometer Recommendations?

A genuine Tiny Tach runs about $50. Shows running time when engine is off.
Cheaper versions available. Here’s the first one that popped up on Ebay.
https://m.ebay.com/itm/Digital-Engin...EAAOSw0exZ8mxI
These have a wire you wrap around the spark plug cable and it picks up the ignition pulses.
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Old 02-09-2018, 06:22:21 AM
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Default Re: Wisconsin AHH Setting Max RPM - Tachometer Recommendations?

Electronic non contact tach at Harbor freight in Santa Clara. $37 and it's an accurate instrument.
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Old 02-09-2018, 07:06:17 AM
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Default Re: Wisconsin AHH Setting Max RPM - Tachometer Recommendations?

Who needs a freakin' tach??!

Just count the exhaust barks for a minute and multiply by two.

Easy!
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Old 02-09-2018, 07:31:10 AM
Phil P Phil P is offline
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Default Re: Wisconsin AHH Setting Max RPM - Tachometer Recommendations?

Hi

You can get these for a reasonable price off of ebay.

I had lost mine and was able to get the 2 pack for $20. This included the low RPM and the higher RPM unit.


http://www.vibra-tak.com/products.html
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Old 02-09-2018, 12:14:48 PM
K-Tron K-Tron is offline
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Default Re: Wisconsin AHH Setting Max RPM - Tachometer Recommendations?

A handheld Stewart Warner or a tiny tach would be my recommendation. I use both. I set the governed speed with my SW tach without a load, and then when I load and actually use the engine, I mount the tiny tach and watch the rpm as I adjust the carburetor and fully loaded speed.

Chris
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Old 02-09-2018, 01:00:38 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Wisconsin AHH Setting Max RPM - Tachometer Recommendations?

I have 2 different tachs, that drive off a crankshaft. One is a Stewart rotary that can read up to 3500 RPM. The other is a Starret counter type. With the counter type, you hold on the crank for 15 seconds, and remove, read the counter and multiply by 4, and you have RPM. I believe it is capable of reading up to I,000 turns, so that gives you a 4000 RPM readability. I have 3 of these, and all are accurate, when compared to each other and the Stewart. The Starret's are precision instruments. Last one I bought was at a flea market - cost me $15!

The Stewart dial is about 3' in diameter. it is also about 4" from face to rubber tip The tach can read in both clockwise and counterclockwise. The Starret tachs are about 4" long from tip to end, and about 2" wide and 1" thick, where the gearing is. With the Starret - you can put it in your pocket, walk around, take it out and take an instant reading on almost any motor or engine in a matter of seconds!
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Old 02-10-2018, 04:01:18 PM
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Default Re: Wisconsin AHH Setting Max RPM - Tachometer Recommendations?

Thanks one and all- great advice!
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