How do you guys do your anuall pressure tests. We figure up our working pressure mathematically. Unless it's a new install we use weights. We use 3.14 x radius squared to find the square inches of the piston. Divide that by car capacity . Then add number to empty pressure for your calculated working pressure. Example let's use a dover 2100lb car 4.35 jack and runnin 240 empty pressure. 4.35 divided by 2 is 2.175. 2.175x2.175 is 4.37. 4.37x pie 3.14 is 14.85 square inches. 2100lb divided by 14.85 is 140psi . 140psi plus 240ep is 380 working pressure. Multiply that by 1.25 ( 125%) ideal relief pressure is 475 relief pressure. Always been within 20psi of using actual weights
