Ignition only

[James Ballenger]

	The spark on the combustion side has a much higher cylinder
pressure.  The higher cylinder pressure effectively increases the resistance
on that side by a very large amount.  To arc across this higher resistance
electrode, significantly more voltage must be seen.  The wasted spark,
cylinder on exhaust stroke, has very little additional cylinder pressure and
take the same amount of current across the arc with far less voltage becuase
there is lower resistance on the waste spark side.

I am hoping for ~40kV on my combustion side and ~5kV on my waste side.  

James Ballenger

>-----Original Message-----
>From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
>Behalf Of don.broadus at exeloncorp.com
>Sent: Thursday, November 09, 2000 11:22 AM
>To: diy_efi at diy-efi.org
>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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