Timer movement

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Model T Ford Forum: Forum 2014: Timer movement
Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman Miller on Tuesday, April 01, 2014 - 09:15 am:

With a properly adjusted timer how far should it move from fully retarded to full advance?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jim Thode Chehalis Washington on Tuesday, April 01, 2014 - 11:31 am:

About 83.5 degrees.
See:
http://www.fordmodelt.net/downloads/Model%20T%20Ignition.pdf

Jim


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mike Kossor on Tuesday, April 01, 2014 - 12:18 pm:

And.... considering a timer housing has a diameter of 3.000" the circumference is 9.424" which represents 720 crank shaft degrees (2:1 Crank to CAM gear ratio). So, 83.5 crank shaft degrees would be 9.424*83.5/720 = 1.093" of physical rotational travel; fully retarded to fully advanced.

I have come across cars with as little as 0.75" of travel due to worn out and mis-adjusted pull rod linkages.


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