I was sitting in a training class at workand as I was falling asleep I started to think about the dimensionsof the rockers to get the different ratio. Does the valve to pivot length of the rocker change or the pivot to pushrod length?

 

I think it would be both. I think you would want to try and keep the arc at the tip of the rock to valve as close to being in the center plane of the valve as you can. To do that you would have to fudge or change both ends. Right??? IDK maybe it's the tool and die maker side of me is taking over and nit picking over the smallest of details that may not matter that much to worry about.

 

After thinking about this somemore, I think the 1.7 rocker would need to be shorter than the 1.6. [sm=confused06.gif]Yes...No?

 

just have to move the fulcrum (pivot point) closer to the pushrod to get a higher ratio...wouldn't want to change the overall length due to changing the valve geometry.

 

Changing the length of the pivot to pushrod end of the rockermakes sense. So, is the pushrod now not centered in the hole thru the head because the end of the pushrod is moved closer to the rocker pivot?

 

The fulcrum would move, but the contact points at the pushrod and valve would stay the same, the mounting point on the head would be offset would me my line of thinking.