jim beam > wrote in news_-dnS91tZMHfzHfRVn-
:

> wrote:
>> TeGGeR® wrote:
>>
>> http://www.tegger.com/hondafaq/ignit...ion/index.html
>>
>> Hopefully this is correct now.
>>
>> Thanks to all for their help, especially Jim Yanik.
>>
>> --
>> TeGGeR®
>>
>> The Unofficial Honda/Acura FAQ
>> www.tegger.com/hondafaq/
>> --------------------------------------
>> I think in the 1990 Honda Civic, the igniter also provides
>> for for some PWM control.


"PWM" control?


> It senses the back EMF and
>> kills the coil drive at the correct momment to insure a
>> hot spark.


Do you know the mechanism by which it sees the back EMF?



>> I played with an ignitor and couldn't get it
>> to because correctly until I connected to to a Honda
>> igntion coil. As I varied the frequency of the drive pulses,
>> all the same width, the output created wider pulse at higher
>> "RPM".
>>
>> Terry
>>
> interesting! i'd read that they did that, but just haven't had the time
> to sit down & test for it. thanks for the confirmation!
>
>


So how come my news server has this message, but not Terry's?

And yes, that's one of the very nice features about electronic ignition
versus Kettering. With Kettering, the very moments you need a fat spark are
the very moments you get a weaker and weaker spark since the system has no
way of increasing dwell time to compensate for RPM.

--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/