Re: battery polarity

Posted by John T on February 13, 2006 at 13:39:23 from (66.244.90.98):

In Reply to: Re: battery polarity posted by RAB on February 13, 2006 at 09:09:45:

RAB and Gary, I simply love this sparky chat so gotta jump in here. Heres how I would sumamrize the condensor size thing, which agrees with what you say basically.

Tooooo much capacitance, a weaker spark, and if its too much, no spark at all. It has to do with that di/dt business and the capacitive and inductive time constant stuff. An oscillograph trace would show the inductive capacitive ringing that occurs right after the points break open which eventually dampens out.

Correct amount of capacitance, maximum spark PLUS fairly good point life, the compromises and trade offs RAB spoke of.

Toooooo little or NO capacitance, rapid point burn up PLUS a weaker spark.

As far as the deposit build up, I could swear the artice I read showed more build up at one polarity then the other, but I fail to understand that and would think it would only matter as to which contact it happened on. Electrons have a mass and when current arc jumps across the points gap, it looks like build ups would occur on the side its jumping to leaving pits/voids on the other side???? Darned if I know I gotta dust off my oldddddddd textbooks if this keeps up lol

John T, a retired sparky

Aint lectricity funnnnnnnnnnnnn

Replies:

• Re: battery polarity Gary Schafer 17:06:35 02/13/06 (0)

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