Re: higher output coils and ballast resistors

["content22207" <brobertson@xxxx>]

MSD coils are already rated .7 ohms (pretty standard) so just continue
to use stock resistors and you'll be fine. Remember: resistors are
there for ignition module's benefit, not coil's. 

If John Hervey's 25,000 volt coil has extremely little resistance
would need bigger resistor to protect module.

Stock circuit is "approximately" 2 ohms -- .5 though each resistor and
"approximately" 1 through the coil (page M:01:03).

You'll notice biggest benefit of HEI when engine is cold, or breathing
cold air.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "Adam 16683" <acprice1@xxxx> wrote:
> I want to kick up the ignition on my car. I've thought of using the 
> MSD blaster2 coil with 45,000V output. My question is; what size 
> ballast resistor should I use with it?
> 
> SpecialTauto has 1.8ohm resistors for the 25,000V coil. While the MSD 
> blaster2 coils come with a 0.8ohm resistor, which they state "will 
> fit most applications". Would the 0.8ohm or the 1.8ohm work for hte 
> 45,000V coil, or do I need an even larger resistor?
> 
> Thanks! 
> adam price 
> 
> http://www.msdignition.com/coil_directory.htm
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> 
> wrote:
> > Actually what you're seeing is the ignition at work. Whenever the 
> coil
> > loses its ground (controlled by ignition module), high tension 
> current
> > builds up lightning fast, then is discharged to a spark plug as 
> rotor
> > passes its terminal. If the coil were grounded all the time, no
> > current would ever build up.
> > 
> > Ignition module and tachometer take their signal from small wire
> > (blue? I'm at work and can't remember color) that passes from
> > distributor to compartment behind driver seat.
> > 
> > Take it easy grabbing ignition wires. While coil ground is only 12
> > volts, HT wires can be as much as 100,000 on newer cars. Even stock
> > DeLo is 18,000 or so (which I highly recommend bumping up at least 
> to
> > 40,000).
> > 
> > Bill Robertson
> > #5939
> > 
> > >--- In dmcnews@xxxxxxxxxxxxxxx, doctorDHD@xxxx wrote:
> > > OK, while playing around with the ignition / idle system of 6530 I
> > noted 
> > > something very interesting. As I previous stated, the tachometer
> > makes small 
> > > jumps upward, intermittently. I accidentally touched the wire 
> that
> > goes to the 
> > > negative side of the ignition coil primary circuit (color WS) and
> > noted that I 
> > > was getting intermittent shocks. These shocks were at the same 
> time
> > that the 
> > > tach jumped! When I connected a small neon bulb (i.e., an NE-2 
> for you 
> > > engineering types), the bulb would blink intermittently along with
> > the jumping of the 
> > > tach. (Hey I got fed up with getting jolted so I substituted the 
> bulb 
> > > instead.) Remember that the engine RPM is NOT jumping only the 
> tach
> > is. I suppose 
> > > the tach is getting these voltage spikes and that is why it is
> > jumping and maybe 
> > > these spikes are affecting the idle ECU controller. The spike 
> occur
> > only at 
> > > low RPM up to about 1400 rpm.
> > > 
> > > Does anyone have a clue as to what to do next?
> > > 
> > > Dave & 6530 thank you...
> > > 
> > > 
> > > [Non-text portions of this message have been removed]