KALEL

well i did some searching and read that if i have a cam with XE-R lobes, then i should change my springs every 15k or so? is this accurate. my cam is a 224/230 112LSA with .567/572 lift. i have comp 918s on it and i put them in in july. i dont want my motor to pop on me, but dont want to get springs too early either

luv2spd

iTrader: (1)

Check the seat pressure on em at 15k and if they're still ok then you can run them longer.

KALEL

how exactly do you check seat pressure??

KALEL

ttt...

mrr23

iTrader: (3)

you have to remove a spring and use a spring tester to check the seat pressure and open pressure.

KALEL

how much would something like that cost? where can i get one?

Cal

iTrader: (1)

You can make your own spring tester with a drill press, digital bathroom scales, and a cheap Harbor Frieght dial indicator.

KALEL

you got a write up on that??

DONAIMIAN

iTrader: (18)

I have an MTI T1 and have no clue how many miles are on em (around 35-40k) and have no issues, although the cam only has .558 of lift, and I dont take it past 6200.

SteelBallz

I would also like to know about how you test the seat pressure.... Can you get the tool and Auto Zone or something like that?

Cal

iTrader: (1)

Ha ha, never thought about doing a write up, it's really quite simple. I'll try and snap a picture of my setup if people are interested.

I just put an old intake valve in the drill press chuck, and a digital bathroom scale on the drill press table. I put the spring on the scales with a metal plate under it to spread out the load a bit. Then push on the spring with the old valve until it's squished down to the seat height, then read the scales. Then do the same for the open height. This is probably a lot more accurate than some spring testers I've seen.