How much pressure is too much for valve springs? I know the stock are around 60#, F1's are around 90#, the Hammilton's are 110#, and then there's some higher pressure like 140# pressure springs. Obviously I don't need the 140# springs, but is 110#'s too much to have on a daily driver I want to get a lot of miles on?

 

If you don't plan on going much over 4K rpms you shouldn't have a need for the #140 springs. The #110 springs are rated for 4.5K rpms @ #80 boost.

 

Arent the F1s 110 lbs too?

 

Stock is left,Sportsmans are right


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
.

 

Here's some interesting reading:

https://www.dieseltruckresource.com/...t=valve+spring

I need to go re-visit my college engineering mechanics text books to understand Hohn's posts!