Laminate Size

[johng]

What does the Coil Post (Laminate) size do for the operation of an engine. We know early Kiekhaefer , Martin, Scott Atwater and some other used a 5/8" post in the 40’s & 50’s and also used a 1/2" post during this time. ??

[outbdnut2]

From a theoretical standpoint, the more iron in the coil’s laminate core,the more energy can be stored when the flywheel’s magnet goes by – this magnetic field induced in the core (laminations) collapses when the points open, transferring it’s stored energy to the secondary winding for spark. This should translate to higher spark current, if all other coil parameters are the same and it just has more iron. On the coils you describe, (which I’m not familiar with), winding wire size and number of turns may also be different.
Dave

[johng]

Thanks for your reply Dave, I’m no Electrical Engineer. Just curious why different Motor Mfg’s. used 2 sizes on similar motors. Could it just be who was supplying the coils to the outboard company’s ?

[outbdnut2]

It’s hard to say why – could be two suppliers, could be design changes to boost performance, or reduce failure rate, or reduce cost, or???

[Author]

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