Re: more DIS questions

[bearbvd@cmn.net (Greg Hermann)]

>W
>> Wasted spark (also called maverick spark) designs fire every plug every 360
>> crank degrees. Once when each is supposed to be fired, and once near TDC on
>> the overlap. The spark on the overlap is what is called the wasted, or
>> maverick, spark. Since all plugs fire twice per four stroke cycle, cam
>> position doesn't matter.
>Don't need cam sensor for non sefi, but still need reference point to
>start coil sequence.  Since cam sensor delivers a synch signal, it's
>easy to think no cam sensor needed means no synch signal needed.  4
>cyl DIS signal goes straight to the module, and begins with cyl 2/3
>coilpack.
>>
>Shannen

Agree with you for just a trigger point for each spark, not if using
something like a 60-2 wheel at crank speed. In that case, the wheel will
tell the ecu where the engine is.

Greg
>>
>> Agree that  for an ecu running SEFI AND a wasted spark DIS, cam sensor is
>> needed for getting the triggering of the injectors timed right. But--for
>> DIS ONLY--no cam sensor needed.
>
>>
>> Greg