Re: Ignition and sparks

[Theo Smit <theo.smit@dynastream.com>]

Hi all,
I'm not trying to be an MSD apologist here...but at least their FAQ 
doesn't slag the others' product.

http://www.msdignition.com/1helpmechoose.htm

I've used the MSD6-AL in my Tiger for a number of years, with no 
trouble, and with fewer ignition related hassles compared to the Mallory 
Unilite that it replaced.

You should be aware that coil energy related issues show up twice as 
quickly in a V-8 as they do in a four cylinder engine, simply because 
the coil is run at double the rate compared to the four, for a given 
RPM. When I was campaigning Toyotas I never had an ignition problem that 
I could directly trace back to the coil charging time or anything like 
that, but when you look at the coil charging current waveform produced 
in typical transistorized ignition and coil, and then extrapolate it to 
the time available at 6000 RPM in a V8 application, it becomes pretty 
clear that you need something more. Pretty much anyone that is running a 
high RPM V8 in competition has either MSD (or Jacobs, or one of the 
other high-voltage coil drivers) or a crank-trigger ignition with 
two-cylinder coil packs, because that's what works.

I did some testing on this with a Pertronix and a Ford TFI module on 
this a few months ago - I'll see if I have scope pictures.

Best regards,
Theo

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