Ignition only

Programmer nwester at eidnet.org
Fri Nov 10 02:50:19 GMT 2000


Lower cylinder pressure is the main reason--the waste spark side
is just the ground path for the secondary winding of the ignition coil.
Remaining coil energy is to the compression side...
Lyndon.
-----Original Message-----
From: don.broadus at exeloncorp.com <don.broadus at exeloncorp.com>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: November 9, 2000 9:15 AM
Subject: RE: Ignition only


>would the difference in the kV voltage on the waste spark side have to do
>with the lower cylinder pressure  or  possibly ionized exhaust products. ?
>Just wondering
>                                                 Don
>> -----Original Message-----
>> From: Programmer [SMTP:nwester at eidnet.org]
>> Sent: Thursday, November 09, 2000 9:42 AM
>> To: diy_efi at diy-efi.org
>> Subject: Re: Ignition only
>>
>> Measure it on an ignition scope sometime...it's not the same kV required
>> to
>> fire the waste side as it is the power side. That's correct about the gap
>> to
>> "some"
>> degree--other than the rotor to tower gap and the plug gap is always on
>> the
>> power side. Not so with DIS. The power side on DIS may be 8-10 kV, where
>> the waste spark side is 1-2kV (measured).
>>
>> Lyndon.
>>
>> >The same current flows across both spark gaps - this must be the case
>> unless
>> >we're losing or gaining electrons somewhere. The high voltage winding of
>> the
>> >coil moves the electrons across both spark gaps in much the same way a
>> >battery moves electrons through (say) two light bulbs in series (note
>> Bruce:
>> >that's series, not parallel, as you stated).
>> >
>> >Okay, the electronic engineers among us may invoke the high frequency
>> nature
>> >of the actual spark current, and note that the capacitance and
inductance
>> of
>> >the high voltage leads and the coil itself have a major influence on
what
>> >currents actually flow where and when. But I'm not going to argue the
>> point,
>> >just to note that when one of the HT leads comes off, then these factors
>> do
>> >become important, but this isn't the usual mode of operation for DIS.
>> >
>> >> In other words, a wasted spark DIS doesn't save you a gap compared to
a
>> >> distributor based system. It just moves it.
>> >
>> >Correct - my original contention  8^)
>> >
>> >Peter.
>>
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