Rocker Ratio Calculator

Calculate rocker arm ratio and valve lift effects

Rocker Specifications

Mode

Cam Lobe Lift (inches)

Measured Valve Lift (inches)

Actual Rocker Ratio

1.500:1

Lift increase: 0.160"

Lift Comparison Table

1.5:1 Rocker0.480" valve lift

1.6:1 Rocker0.512" valve lift

1.7:1 Rocker0.544" valve lift

1.8:1 Rocker0.576" valve lift

Formula

Rocker Ratio = Valve Lift ÷ Cam Lift