Mike Rogers wrote:Has any one seen the ratio of the rocker arms off on Jesel shaft rockers.I,am do the cam checks for the Hooters engine i,am building and we must have .625 lift with no lash.The cam lift is .347 rocker ratio 1.8
should come up .6246 at the valve.What i,am getting is .640 lift at the valve tryed both sides of engine #1 and #6 with two diffrent rockers.This is on the intake side.Ex. side is the same but with a 1.7 rocker and cam lift of .367 i get valve lift of .633 with 0 lash.
Adger Smith wrote:Mike,
Take the original rockers and set then up with the adjuster cup out of the rocker seat by 2 1/2 turns. this will require shorter pushrods. The rocker ratio is set at 1 1/2 turns out of the cup seat. It will reduce the ratio because of the placement angle of the adjuster cup. It pulls the adjuster cup away from the fulcrum, making the ratio smaller. I could go on,--- if you want more call (903) 794-7223