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mrbilman · 04-21-2024, 06:45 PM

Thanks to everyone who chimed in! As a result I understand how this should be set and I have no doubt that the 2 tooth steering column will have to be rotated to get the correct setting.
As a follow up-
i inspected my car (a 1931) and it was set up correctly. i did some math by measuring the diameter of the Distributor Housing (3.165") and figured out that 20 Deg. is equal to .552" on the circumference. The spark advance arm is about .455" wide at the slot so adding these two numbers equals a theoretical
slot width of 1.007" on the circumference. The slot width on this housing is .998" (straight across) and the arm just touches on each end of travel before the advance lever hits it's stop.
My conclusion is that the slot should measure very close to 1.00" and be concentric with the centerline of the spark terminals.
Thank again!

04-21-2024, 06:45 PM	#12
mrbilman Junior Member Join Date: Apr 2015 Posts: 24	Distributor Cap Advance Lever Slot Follow Up Thanks to everyone who chimed in! As a result I understand how this should be set and I have no doubt that the 2 tooth steering column will have to be rotated to get the correct setting. As a follow up- i inspected my car (a 1931) and it was set up correctly. i did some math by measuring the diameter of the Distributor Housing (3.165") and figured out that 20 Deg. is equal to .552" on the circumference. The spark advance arm is about .455" wide at the slot so adding these two numbers equals a theoretical slot width of 1.007" on the circumference. The slot width on this housing is .998" (straight across) and the arm just touches on each end of travel before the advance lever hits it's stop. My conclusion is that the slot should measure very close to 1.00" and be concentric with the centerline of the spark terminals. Thank again!