[novapower]

just wanting to know.when you look at msd or who ever they say { puts out 150 mj and 550 volts power.what does mj really stand for and how much does a stock hei put out.

 

[voodoochikin04]

hei, high energy igniton says 50,000 volts...

 

[firebird77clone]

mj could be milli joules.

Yeah, that's a lot of help, I know.

Stock coil, 12Kvolts
HEI 30K volts
Performance HEI 50Kvolts