The old condensers tested at .47 and .52 mfd.
Garry S.’s data says .1 for 1937 to 41 Lightfours, Zephyr, etc.
Would the specs for a 1935 Imperial Lightfour have been
that much different, or more likely someone put some automotive
condensers in at some point?
Have some axial caps on order, but would like to install the
correct ones.
Also, are the Imperial, and later lightfour coils the same as
Zephyr coils?
Zephyr and Lightfour coils are interchangeable. If it has soft iron core magnets in the flywheel, 0.015µƒd is maximum. Alnico magnets specify 0.020 µƒd + or – 0.004 µƒd.
Garry, Thanks for the information! I was able to use the old coils, and ended up
putting in .01 axial caps. The 1935 fire pump Lightfour was missing it’s flywheel,
and I plan on putting the flywheel from a 1937 Lightfour part motor I have.
Can I assume that one that early would have the soft iron core magnets?
Thanks!
The Alnico magnet was developed by General Electric under a WW2 government contract. It came into general use in 1945. Now a days where space and weight are critical, rare earth magnets are used.