How does the Quick Lift rocker arm design ratio change take place?
The ‘Quick Lift’ rocker body design provides an initial valve opening rate at least 0.1 ratio higher than the advertised ratio. The ratio then decreases through the first .300 net valve lift until the advertised ratio is achieved. From that point on the advertised ratio is maintained until the valve is within .300 of the seat and then the ratio increases back to 0.1 ratio more than advertised. This ‘varying’ ratio is a result of the pushrod seat location in the bottom of the rocker body. Our new ‘Quick Lift’ bodies have a lower pushrod seat location (when compared to other rocker arm bodies) that causes the pushrod tip to contact the rocker body at a lower point in the pushrod seat’s operating arc. It is also important to remember that the effective rocker arm ratio is the perpendicular distance from the rocker arm tip where it contacts the valve tip to the centerline of the rocker arm stud (or pivot point) divided by the perpendicular distance from the pushrod seat to the rocker arm s
