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Garden Tractors Discussion Forum

Re: Tecumseh HH100

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joe csuti

01-14-2013 13:31:58

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With an electrical circuit that has an inductive load(coil)when the sw contacts or points open a back emf or spike voltage is generated up to 3X the supply voltage for a fraction of a second as the magnetic field in coil is collapsing

The function of the condenser is to absorb/quench this spike voltage to reduce voltage to as near 0V as possible before next close/open operation of points,this now gives max voltage buildup in coil primary & giving max hv to plug,without condenser or if condenser open/shorted voltage in primary of coil stays high & gives the same effect as points not opening,the condenser also prevents arching/burning of point contacts.

I've had the same experience as anon with several briggs eng with a bad/weak condenser,eng would be hard starting & only run rough at idle/slightly above & when you goosed throttle eng would die.

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01-17-2013 13:24:00

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 Re: Tecumseh HH100 in reply to joe csuti, 01-14-2013 13:31:58  
Thanks for the lesson on just how that all works. Kinda remember that from reading a Motors Manual forty years ago, but sorta lost the details.


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01-17-2013 13:13:47

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 Re: Tecumseh HH100 in reply to joe csuti, 01-14-2013 13:31:58  
I've also had that when the condenser was bad, but mine wouldn't run at all, like you said, beause it was open/shorted. I was just confounded by the fact that it would run without one. Irv

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