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Sparks per revolution?

Ralph Wiggum

By Ralph Wiggum
January 26, 2011 in Boats & Motors.

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Ralph Wiggum

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Ralph Wiggum

Posted January 26, 2011

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Posted January 26, 2011

I need to know how many sparks per revolution my motor puts out in order to install a tach. How can I determine this?

The motor is a 1993 Merc ELHPTO 60 HP, 3 cylinder.

Thanks!

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boatfixer

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boatfixer

Posted January 26, 2011

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Posted January 26, 2011

Set the pole setting to 12 on the back of the tach

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Ralph Wiggum

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Ralph Wiggum

Posted January 26, 2011

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Posted January 26, 2011

Set the pole setting to 12 on the back of the tach

Thanks, but that doesn't help. This is a Tiny Tach TT2A. This is the chart in the manual:

45° = 8 sparks per revolution

60° = 6 sparks per revolution

90° = 4 sparks per revolution

120° = 3 sparks per revolution

180° = 2 sparks per revolution

360° = 1 spark per revolution

720° = 1 spark per 2 revolution

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delcecchi

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delcecchi

Posted January 27, 2011

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Posted January 27, 2011

It is a 3 cylinder two stroke, wouldn't that be 3 per revolution? As I read the shop manual there are 3 pickup coils and one magnet in the flywheel to trigger the sparks. So I vote for 3 sparks per revolution.

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Ralph Wiggum

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Ralph Wiggum

Posted January 27, 2011

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Posted January 27, 2011

It is a 3 cylinder two stroke, wouldn't that be 3 per revolution? As I read the shop manual there are 3 pickup coils and one magnet in the flywheel to trigger the sparks. So I vote for 3 sparks per revolution.

That makes sense. I guess worst-case is I mess around with it till it seems right

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boatfixer

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boatfixer

Posted January 27, 2011

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Posted January 27, 2011

Makes perfect sense to me to

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Ralph Wiggum

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Ralph Wiggum

Posted January 27, 2011

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Posted January 27, 2011

Sometimes, when you actually think about something, the answer really makes sense

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boatfixer

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boatfixer

Posted January 28, 2011

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Posted January 28, 2011

Aint dat da troof

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