Shamino, the point is that the more power you output the more heat that needs to be dissipated. Power and heat is based on the energy stored and released plus the number of cycles (frequency or rpm), the higher the frequency the more heat is generated. You either live with the power level you have or reduce it by whatever means you have like, resistance, impedance, or voltage..etc. MSD ignitions can draw up to 14 amps or more at high rpm and yes they get hot.

Calculate for the primary only.



or use the website calculator: http://www.1728.org/resfreq.htm

Ray