Re: Point Gap/Effects on Operation

Posted by txgrn on July 28, 2005 at 05:14:15 from (209.151.117.135):

In Reply to: Point Gap/Effects on Operation posted by JKC on July 27, 2005 at 13:01:55:

Didn't read the other answers. Here's my 2c.

The gap sets the time the coil is sucking current. Current is energy (1/2 LI squared) where L is the inductance of the coil and I is the current running through it.

The longer the points stay closed (narrow gap) the more the current buildup in the coil (exponentially increases). So take that times the number of times you do it per unit time (rpm x # of cyl/2)and you have power transferred.

Part of that is loss in the coil which generates heat (winding resistance and core loss). Heat kills coils....but I never took an ignition coil apart to see just why.....melted solder or melted varnish.

What's funny about heat problems is that usually when the unit cools it goes back to functioning normally......till it gets hot again.

On the other side, if too open, low current to the coil and to the plug and it may not fire the plug.

So yes it could to answer your question.

(Not being a smarta$$ here but being retired, I have to keep my brain functioning.....one reason for yakin with you guys......and I like you.)

HTH

Mark

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