Hi Lynn,

Do you know if the MSD replacements for the LS1 coils are as hot as the
real MSD systems?  I've got a set of LS6 coils that the ad on ebay said
had a higher spark voltage than MSD, but haven't tried them yet.

Bob W.

The list of coils that work with the MSD is in the box with the system. Also, the list used to be on the MSD web site. The difference is that the primary voltage is 350 volts instead of 12 volts. Coils with internal resisters may overheat and open the resister. High turns ratio coils designed for 12 volt systems may perform poorly at 350 volts. Coils listed by MSD work just fine. I don't know if using the listed (as safe) coils will perform well at only 12 volts. 

 

Energy out = energy in, minus efficiency losses (heat). No matter what the add says.

That is energy, not voltage. Plan for one amp per thousand RPM

 

If you find yourself with available energy at the coil primary will be reduced. So, the secondary voltage will be reduced. The MSD and most others will work down to about 8 volts.

 

Clean plugs will continue to fire at reduced voltage. Carbon covered plugs may provide a sufficient alternate path to short the plug. Continued operation into this unhappy situation may be improved by gapping the plugs a bit closer than is common. The .010" I use would be a bit much, but you get the idea.

 

Should this develop the engine will begin to misfire. Reducing throttle slightly will bring it back for a while, by reducing the effective compression ratio. (because cylinder filling goes down).

Repeat until below 8 volts, and then glide as required.

 

Lynn E. Hanover