Timing Gear Drive
OK guys,
I'm installing my cam and degreeing it this weekend. After re-reading most of the thread, I did a little thinking and some research.
If I am correct, there are different degrees to the crank gear. There are five keyways and 26 teeth. After some high school geometry, it is clear that the keyways are all evenly spaced at 72* around the inside of the gear. One keyway lines up almost perfectly with one tooth, the other four are all offset from a tooth by varying degrees. 26 teeth equal 13.846* per tooth, or 69.231* per 5 teeth. So, wouldn't moving the gear to a keyway either to the right or left of the "inline" keyway retard or advance the timing? And moving it two keyways left or right "double" that amount of advance/retard?
Did anyone else notice the offset between the teeth and the keyways? And if so, which keyway did you use?
Here's a pic, not sure if it will show up well enough. The tooth/keyway on the left with the Sharpie mark is the one that lines up, the others are all a bit off.
OK guys,
I'm installing my cam and degreeing it this weekend. After re-reading most of the thread, I did a little thinking and some research.
If I am correct, there are different degrees to the crank gear. There are five keyways and 26 teeth. After some high school geometry, it is clear that the keyways are all evenly spaced at 72* around the inside of the gear. One keyway lines up almost perfectly with one tooth, the other four are all offset from a tooth by varying degrees. 26 teeth equal 13.846* per tooth, or 69.231* per 5 teeth. So, wouldn't moving the gear to a keyway either to the right or left of the "inline" keyway retard or advance the timing? And moving it two keyways left or right "double" that amount of advance/retard?
Did anyone else notice the offset between the teeth and the keyways? And if so, which keyway did you use?
Here's a pic, not sure if it will show up well enough. The tooth/keyway on the left with the Sharpie mark is the one that lines up, the others are all a bit off.