HEI HEI

[Sandy]

At 12:12 AM 2/20/98 -0800, you wrote:
>Just had a look at the Moto data sheet for the MC3334, this shows dwell as
>being set by an external cap and some internal reference buffer circuitry
>linked to the current limiting circuitry.  To me it seems that if you
>decrease the coil resistance then it will automatically reduce the dwell
>because it only allows for a set charging current, this being determined by
>a trimpot to the current limiting circuitry (according to the data sheets),
>you may need to reduce the charge current a bit to avoid burning out the
>coil.  Probably sounds really confusing, so check out the data sheets.

Is it assumed that the 3334 is on the inside of an HEI module?

>On another note, has anyone looked at the MC33093, MC33094 and MC79076 all
>of which are very similar to the above unit, but with extra features such as
>car push starting capability, coil current limiting, etc.
No, these parts are ususally pretty hard to get, even the 3334 can be
somewhat difficult.

>Also anyone looked at the MC33293 quad fuel injector driver, you can
>paralled the outputs if required for lower Rds-on and higher driving
>capability, fauld output indicator if a load goes open circuit, etc.
>Definitely worth a look.
Yep, another one that is a hard part to get. Very nice however.

>Dan     dzorde at geocities.com
>
>>One more twist to the HEI problem, if the 4 terminal modules do have dwell
>>control, is it just time base from the charge on a cap. What I getting at,
>>if the HEI coil is 2 ohms (Just guessing, anyone know) on the primary side,
>>and I use a different coil, lets say the dual post ones that are around .6
>>the dwell time could be way off, and toast the dual post coil. I This all
>>depends on the primary coil resistance and the amount of dwell. May not be
>>a big deal, but the thought has crossed my cone shaped mind.
>>
>>Sandy
>>
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