02-13-2008, 01:27 AM | #1 |
Not Yet Wild
Join Date: Feb 2008
Posts: 18
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Does anyone run a Tachometer?
Does anyone run a Tachometer on there cart? If so how does it work?
I am looking to hook up a tach with a magnetic pickup or pulse generator and wondering if anyone has done this? |
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02-13-2008, 01:33 AM | #2 |
supervision required
Join Date: Dec 2007
Location: Augusta AR.
Posts: 2,225
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Re: Does anyone run a Tachometer?
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02-13-2008, 01:42 AM | #3 |
Gone Wild
Join Date: Dec 2006
Posts: 679
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Re: Does anyone run a Tachometer?
Tachs are basically frequency counters so set it on 4-cylinder engine and use two magnets on the same pickup.
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02-13-2008, 07:20 AM | #4 |
WILD
Join Date: May 2007
Location: lebanon county,pa
Posts: 1,266
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Re: Does anyone run a Tachometer?
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02-13-2008, 08:45 PM | #5 |
Not Yet Wild
Join Date: Feb 2008
Posts: 18
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Re: Does anyone run a Tachometer?
I am experimenting with a bicycle speedometer right now. Seems to be accurate, just have to multiply by 10.
I was hoping to hook up a digital tack with a shift light, and set the shift light rpm at the high efficiency curve. If you know where do find a pickup for a tach please let me know. Thanks |
02-13-2008, 09:16 PM | #6 |
Gone Wild
Join Date: Dec 2006
Posts: 679
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Re: Does anyone run a Tachometer?
Caddymankc, it is quite simple when you break it down into what you know.
So what do we know? Tachs get their signal from the primary side of the ignition coil. The primary side is 12 volts so we know the voltage of the signal we need. Most 4-cylinder engines are four stroke so that would be two pulses every revolution. It would be four pulses every rev if it were a two stroke 4 cylinder engine. So the tack will work if it gets two 12V pulses every revolution when set on the 4-cylinder setting. It would probably work with less than 12V as the signal also. Signal could be generated from two magnets on the electric motor's shaft and a magnetic pickup like a "HALL effect sensor" pulsing into the gate or base of a transistor that has 12V on one lead and the tach input on the other lead. It is a little more complicated than that but there is you basic setup. |
02-15-2008, 06:23 PM | #7 | |
WILD
Join Date: May 2007
Location: lebanon county,pa
Posts: 1,266
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Re: Does anyone run a Tachometer?
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