Thanks. It looks like the piston diameter is roughly equal to the canister inside diameter. I subtracted the diameter of the outlet port to come up with an area of 1.58 square inches. At that value the 30 psi big block spring returned a calculated pressure of about 26.4 at the installed height you measured. Did you ever measure pressure with that spring installed?
This helper sheet could be made into a spring database of sorts by measuring data such as number of coils and wire diameter. Maximum compressed height before coil bind could be determined along with max pressure for a given spring. That's probably more data than most people need to have though. The "pressure change per 1/4 turn" is based on the internet instructions which install a 24 thread per inch screw in the bottom of the regulator. Using a metric bolt or a machine screw with different thread pitch would alter that calculation.
At least this will give an idea how much pressure can be obtained from various springs.
Last edited by 1project2many; 10-01-2012 at 07:18 PM.
Bookmarks