Does anyone run a Tachometer?

MRC · 02-13-2008, 01:27 AM

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?

Riorat · 02-13-2008, 01:33 AM

Quote:

Originally Posted by MRC

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?

I have a tiny tach on my 95 CC it works great.

Nate · 02-13-2008, 01:42 AM

Tachs are basically frequency counters so set it on 4-cylinder engine and use two magnets on the same pickup.

caddymankc · 02-13-2008, 07:20 AM

Quote:

Originally Posted by Nate

Tachs are basically frequency counters so set it on 4-cylinder engine and use two magnets on the same pickup.

Ive never messed with a tach, are you saying that wires going to a sparkplug you run both plugs to one wire?Can you explain a little more?

MRC · 02-13-2008, 08:45 PM

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

Nate · 02-13-2008, 09:16 PM

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.

caddymankc · 02-15-2008, 06:23 PM

Quote:

Originally Posted by Nate

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.

I forgot i was in the electric section i get it now.

02-13-2008, 01:27 AM	#1
MRC Not Yet Wild Join Date: Feb 2008 Posts: 4	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?
MRC Not Yet Wild Join Date: Feb 2008 Posts: 4

02-13-2008, 01:42 AM	#3
Nate Gone Wild Join Date: Dec 2006 Posts: 372	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.
Nate Gone Wild Join Date: Dec 2006 Posts: 372

02-13-2008, 08:45 PM	#5
MRC Not Yet Wild Join Date: Feb 2008 Posts: 4	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
MRC Not Yet Wild Join Date: Feb 2008 Posts: 4

02-13-2008, 09:16 PM	#6
Nate Gone Wild Join Date: Dec 2006 Posts: 372	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.
Nate Gone Wild Join Date: Dec 2006 Posts: 372

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