Lil' Thumper Piston Pump Calculator

To determine pump setting:

  1. Insert your variables (in RED)
  2. Set your Sprocket Ratio
  3. Read the output (in GREEN)

*Click anywhere on this page to submit calculations

( NOTE: a 12 Row setup with 30" rows = 360 )
(measured from ground surface to center of hub.)

Sprocket Ratio Calculator

Replace the 1's below with your data. If you know your current ratio, set the first drive teeth box to the known ratio and leave the driven teeth at 1 otherwise, follow the steps below to calculate your sprocket ratio.

**Determine size (number of teeth) of drive wheel sprocket and driven wheel sprocket. To use this calculator, replace the 1's with drive teeth and driven teeth.

Press Wheel Note:

On units with press wheels, the radius in inches of the drive wheel can be considered as number of teeth on the drive sprocket and the radius of the press wheel can be considered as the number of teeth on the driven sprocket.

Drive Teeth

Drive Teeth Driven Teeth Drive Shaft

Pump NOT TO EXCEED 210 RPM

MPH Pump RPM
1 US fluid ounce = 1.8046875 cubic inches

Read recommended pump settings below. Set your pump between the recommended settings to achieve the desired output.

Pump Setting PP1 PP2
From
To