F1 Diesel 24v Pro/Sportsman Valve Springs
Alloyed from Chromium Steel the Pro/SportsMan springs are designed to be used with the Helix 2 and Helix 3 camshafts. They control the valve train without any compromise. They fit in the stock location, use the stock retainers and locks and will not rip the stock valve seals up like a double spring will. They are triple shot peened, and special process hardened to proved a life long solution for the Cummins 24 Valve engine. RPM range is unlimited. Boost is unlimited. You will not float with these. The steel used is an ovate shaped wire, not round. This allows high lift cams to never coil bind and plenty of room to install even the most radical lift lobe camshafts.
STOCK and Pro/SportsMan Spring Pressure Curves
Stock Pro
Seat Pressure 80 lbs 93 lbs
.100" lift 100 lbs 125 lbs
.200" lift 120 lbs 157 lbs
.300" lift 145 lbs 193 lbs
.325" lift 150 lbs 200 lbs Stock 24V Intake lift at the Valve
.395" lift 175 lbs 225 lbs Stock 24V Exhaust lift at the Valve
.400" lift 179 lbs 230 lbs
.450" lift COIL BIND 245 lbs
.500" lift COIL BIND 255 lbs
.550" lift COIL BIND 265 lbs
.568" lift COIL BIND 270 lbs
Pictured here is a computer analysis of the ovate wire spring VS the round wire spring under load. The red and blue areas indicate the highest and lowest stressed area respectively. The ovate wire is clearly less stressed and the stress is not located inside the spring coils like the round wire is. This lower stress will increase spring life, durability and generate lower heat. The larger cross section in the ovate wire shows much more blue
( low stress ) areas as well.
Stock Round Springs Pro/Sportsman Spring
