Ignition coil charge time

[robert dingli]

Hi guys,  this morning as I drove in to Uni, I was playing around with the
coil charge time in an attempt to solve some wierd noise problems that I
have been having.  I logged in, read my mail and you guessed it  - coil 
charge time is the current topic of discussion.

> Bill Lewis wrote:
> >Does anyone know how to figure out the correct charge time for a given
> >ignition coil?
> >
> >Should you run the coil until the current saturates?  Slightly less, or longer?

and Ed replied,
> 
> 1) Don't use so much charge time that the coil overheats and melts.
> 
> 2) Don't exceed any other physical or electricals limit to the coil or drive circuit.
> 
> 3) Use as much charge time as you can so you can build maximum current in the coil, so 
> long as you don't run into problems with 1) or 2).
>