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tacho wire

by Mark Hills in 2 Stroke Technical Questions 7 years ago

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Re: tacho wire

by Daniel » 7 years ago

Daniel

1 2 0

Would this circuit work for a Bosch Points Ignition system?

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Re: tacho wire

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.97k

It might be OK as shown.

For any points type ignition, you might Increase or eliminate the 47K resistor and reduce the second 10K resistor down to 1k or less.

You really will need an oscilloscope to see what you are getting, otherwise, it is just a trial and error shot in the dark.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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Re: tacho wire

by Lauri Buell » 6 years ago

Lauri Buell

0 1 0

The MSD 6 series ignition modules have to take a trigger signal in order to output to the ignition coil. So if you are hooking it to a V8 your trigger signal will be 4 pulses per rev of the crank and so will the tach output. The only reason it is even provided is because the MSD modules are a capacitive discharge ignition with multiple discharges. This would be unsuitable for a tach to read directly off of the coil.

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