What else could the magneto be used for?

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Model T Ford Forum: Forum 2017: What else could the magneto be used for?
Top of pagePrevious messageNext messageBottom of page Link to this message  By George John Drobnock on Wednesday, May 31, 2017 - 03:57 pm:

So there are inventive types out there and there has been discussion on having a tach for the T motor.

So where is the tach that uses the magneto to measure engine RPMs?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Tom Carnegie Spokane, WA on Wednesday, May 31, 2017 - 06:31 pm:

The Buzz tach made by Buzz Pound did just that.


Top of pagePrevious messageNext messageBottom of page Link to this message  By George John Drobnock on Wednesday, May 31, 2017 - 08:06 pm:

A bit more information please... Did the Buzz Tach read pulses from the magneto magnets?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Cascisa - Poulsbo, Washington on Wednesday, May 31, 2017 - 09:03 pm:

The model T magneto is a variable amplitude speed dependent variable frequency source.
A tachometer is a frequency to voltage converter.

Be_Zero_Be


Top of pagePrevious messageNext messageBottom of page Link to this message  By Tom Carnegie Spokane, WA on Wednesday, May 31, 2017 - 09:22 pm:

"Did the Buzz Tach read pulses from the magneto magnets?"

It read the frequency of the voltage from the mag and as Bob said, converted it to an analog reading on a sweep hand gauge.


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dewey, N. California on Wednesday, May 31, 2017 - 10:27 pm:

Tom,
Bob may have said that, but he said it in technical terms that the average guy couldn't translate! So, it seems the answer is "Yes, the magneto can run a tachometer."


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mike Kossor - Kenilworth, NJ on Thursday, June 01, 2017 - 11:01 pm:

Here is another example: This Tachometer uses the magneto to measure engine RPM..... and magneto RMS output voltage, and magneto internal resistance and magneto magnetic field strength.

ECCT MT Option

Engine RPM is calculated by measuring the time between magneto voltage pulse frequency and calculates engine RPM knowing there are 8 (positive) magneto pulses per crank shaft revolution.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Cascisa - Poulsbo, Washington on Thursday, June 01, 2017 - 11:29 pm:

David,

Sorry for getting out of control with "Jargon".

I actually did a little fooling around with the Mag-Tach concept.

My preliminary findings showed that the AC Sine-wave from the mag became very noisy when the coils were operating.

This project is "On-The-Stack" now that I am retired.

In general, I thing a reasonably accurate Tach that runs from the Mag is doable.

Be_Zero_Be


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dewey, N. California on Friday, June 02, 2017 - 12:45 am:

Bob,
That's OK, you probably didn't even give it a second thought when you posted! When we work with a specialized technology a lot and a long time, often time we don't realize when we are talking "gobbledygook" to others!
When you get back to the project, it sound like it might be a neat addition to the T world.


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