Some Break-in Ifo from Crane

If you want to calculate actual OPEN spring pressure, the rocker arm has little to do with it.

To do the math, you need to know several things.

1. Seat pressure at your installed height.
2. Spring rate (given in pounds per inch)
3. ACTUAL lift.

Then do the math.

If you have 100 lbs at 1.700, and an actual lift of .500, with a spring rate of 300 lbs/inch it works out to:

100 plus (spring rate times lift) or using the above numbers .500 times 300, which equals 150.

Now add the 100 (from seat pressure) to the 150 from lift time spring rate and you get 250 over the nose.

The EXACT same spring with .600 lift would be 280 OVER THE NOSE with the same seat pressure.

It's all simple math but you need all the variables to do the math.