pete 23 said: (quoted from post at 17:53:02 08/24/13) Once you determine top dead center mark like was told, I can tell you that 22 degrees before top dead center is l 7/16 before that. Fire crater pistons are timed to that mark at full throttle. Some one may have marked off the 40, 30, 25 and 22 or maybe even 16. Hard to tell but they can all be figured out pretty easy with a little math.
Based on Pete's info and with a little backwards math I concluded:
Pulley diameter is roughly 7.49" calculated from backwards math (I do not have precision equipment to actually measure it but that backwards math calculated diameter seems to be rather valid on a quick double check using my eyeballs and a crude tape measure and my standard ole Farmall M as a reference).
22 degrees is 1.438 inches (or roughly 1 7/16") from TDC mark.
30 degrees is 1.960 inches (or roughly 2") from TDC mark.
40 degress is 2.614 inches (or roughly 2 5/8") from TDC mark.
(Note: Use a flexible tape measure and follow the pulley circumference shape to measure the mark from the one you determine is TDC. Knowing which mark is TDC on #1 cylinder is crucial. Even if you have to remove the #1 spark plug and improvise use a common drinking straw and remember to be on compression stroke while an assistant turns the engine over by hand -then you will be able to easily tell which mark is actually TDC).
If you want the formula that I used to figure your own degree setting then use the following formula:
(7.49) x (3.1415) x (your desired degree number) / 360 = the inches from TDC mark
This post was edited by rankrank1 at 12:33:42 08/24/13 11 times.
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