At 08:04 AM 11/06/98 -0700, you wrote:
>At 05:35 AM 6/11/98 -0700, you wrote:
>>First clarification,
>>- your fly wheel has 58 or 60 teeth?
>>- are they on a 6 deg. pitch?
>>- why do you need such a long dwell time? 72Deg?
>>- where are the other 4 cylinders :^)
>>
>>At 6000 rpm a cylinder fires on a 5mS interval (assuming this is a 4
>>stroke/cycle engine) but each cylinder fires on a 20ms interval. Why
>>dont you fire a pair of cylinders together? that way you only need 2
>>outputs and only have to keep track of two timing events. There is no
>>problem firing a plug during the exhaust stroke. If your four cylinder
>>engine runs cyl 1&4 and 2&3 in mechanical phase, of course.
>>
>>Craig Lee told us >>>>
>>
>>I'm designing a spark advance using the 16C73A.
>>
>>-snip-
>>_________________________________________________________
>You can, in fact, many newer autos do just that. Down side: extra wear on
>the plugs.
>John
>
>

That's why car manufactures are looking at using Platinum plugs (100 000Ks
before replacement!)

Dennis
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Dennis Plunkett: Embedded Hardware, Software design
NEC Australia DRMASS
ph 03 9264-3867

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