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The answer is not simple or direct. There are advantages and disadvantages for sync or non-sync. Did you happen to try feeding the motor with 140V from a step up type variac? Often this will keep it in sync. If you created flats on the rotor that are at least 1/4 the width of the full rotor diameter, that is enough metal to remove. Some small motors are very wimpy and don't work well such as small shaded pole fan motors. And of course you should have 4 flats on your motor. Yes the preferred break rate has a lot to do with it. Sync operation is most beneficial at low break rate of 120 bps. However it's absolutely necessary to use a large enough capacitor to take advantage of this. Back in the "day", a lot of people were installing a sync gap onto their TC and getting worse results because they were using a small capacitor with a static gap previously. They left the small capacitor in place and therefore saw a reduction in spark length when they installed the sync rotary gap. For anything over 120 bps, sync doesn't really help, you might as well use non-sync or a static gap. Gary Lau posted some information about the best capacitor sizes for sync or non-sync, etc, in the past and I guess this is at his website. Also JavaTC might give some information about the best capacitor values for sync or non-sync, for NST powered coils. 120 bps sparks will not be quite as bright as higher breakrate sparks. Also they tend not to create the kind of long tendrils that can form at higher breakrates. Certain coils tend to show these long thick tendril type sparks. John -----Original Message----- From: Daniel Kunkel <dankunkel@xxxxxxxxx> To: Tesla list <tesla@xxxxxxxxxx> Sent: Sun, Feb 25, 2018 9:45 am Subject: [TCML] Best Spark Gap for NSTs? I modified a 1725 rpm motor to run in salient pole operation years ago. It will seek and then lock into phase and then break out again. I think I recall reading that if you don't remove enough rotor material it will seek. If you remove too much it will over heat. So before to I take this back to machining, is it even worth it? What is the best gap for NSTs? Is SRSG is the answer what is the preferred break rate? ~Dan To synch or not to synch Kansas City area _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla