how to calculate cam lift with 1.7 rockers

To calculate the cam lift with 1.7 ratio rockers, you’ll need to know the lift specifications provided by the camshaft manufacturer. The lift specification is typically given as the “advertised duration” and the “lobe lift.” Here’s how to calculate the cam lift using 1.7 ratio rockers:

1. Find the Lobe Lift:

  • The lobe lift is the actual lift of the camshaft’s lobes and is typically provided in inches or millimeters by the camshaft manufacturer. It’s the lift measured at the camshaft lobe without considering any rocker arm ratios.

2. Apply the Rocker Arm Ratio:

  • To calculate the lift at the valve using 1.7 ratio rockers, simply multiply the lobe lift by the rocker arm ratio.
  • The formula is:
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  • Valve Lift = Lobe Lift × Rocker Arm Ratio
  • In this case, the rocker arm ratio is 1.7.
  • 3. Calculate the Valve Lift:
  • Plug in the lobe lift and the rocker arm ratio into the formula to calculate the valve lift:
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  • Valve Lift = Lobe Lift × 1.7
  • This will give you the lift at the valve with 1.7 ratio rockers.
  • Here’s an example:
  • Let’s say the camshaft’s lobe lift is 0.300 inches. To calculate the valve lift with 1.7 ratio rockers:
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  • Valve Lift = 0.300 inches (Lobe Lift) × 1.7 (Rocker Arm Ratio) = 0.510 inches
  • So, the valve lift with 1.7 ratio rockers in this example is 0.510 inches.
  • It’s important to note that the actual valve lift can also be affected by other factors, including the base circle of the camshaft, lifter type, and valve lash adjustment. Therefore, it’s recommended to consult the camshaft manufacturer’s specifications and consider these factors to ensure accurate valve lift measurements for your specific engine setup.

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