1.6 Rocker Arms for /6
To change (increase) the ratio you need to either move the pushrod pocket closer to pivot point (center of the rocker shaft in this case) or lengthen the distance from the pivot to center of the valve. A longer arm on the valve side of the rocker would also require you to move the rocker shaft farther from the valve stem to keep the tip of the rocker centered on the valve stem). Pushrod length would change only if a change was needed to keep the new configuation rocker arm (different ratio in this case) sweeping accross the center of the valve stem as it moves up and down following the cam lobe. Hope that makes it a little clearer.
this is what I found from a hotrod article I found I've been doing research all day on this matter
it shows that the difference between the ratio is the length of the valve stem side which in my mind is to open the valve to its fullest right or wrong if my thinking is wrong
now if a builder were to mill the head lets say. .080 wouldn't that change the geometry of the valve train making the push rod .080 of a inch longer which would in turn would open that valve that much farther
please correct me if I'm wrong
aaron
To change (increase) the ratio you need to either move the pushrod pocket closer to pivot point (center of the rocker shaft in this case) or lengthen the distance from the pivot to center of the valve. A longer arm on the valve side of the rocker would also require you to move the rocker shaft farther from the valve stem to keep the tip of the rocker centered on the valve stem). Pushrod length would change only if a change was needed to keep the new configuation rocker arm (different ratio in this case) sweeping accross the center of the valve stem as it moves up and down following the cam lobe. Hope that makes it a little clearer.
