LSONE

iTrader: (1)

i've had my prc dual springs for about a year and a half, running the torquer cam. there is probably about 10,000 miles on them right now. I am getting a turbo kit and will be running a much smaller cam (.28X lift) and was wondering if it would be worth it to invest in some new springs or if my old ones will be fine?

kick_*ss

iTrader: (1)

Not scientific but the REV doubles lasted 1 year maybe 15000 miles and one shattered ( not just on my but friends TA that put them in the same weekend ). His broke 1 week before mine did.

Crane Doubles, going on 42000 miles and 3 years with a tr224 CAM.
NOW as far as the trak cam using the same springs most likely less.

cenTX-LS1

iTrader: (1)

Jon over at TSP said he'd personally feel comfortable going 20k on a torquer 2 with the PRC duals.

ThirdGenLS1

iTrader: (11)

i would check one of them see how they are doing, if they look good leave them in for another year and then check them again.

Justin

JL ws-6

iTrader: (50)

What do you feel better doing.. leaving them on and finding out how long they will last when one fails, or would you feel better putting new ones on?

For the $ that they cost I'd toss new ones on before taking a chance of one breaking, dropping a valve, and then having a piece of that fly into your nice new turbo, but that's me.

Dom

iTrader: (2)

They wear out? Good I read this thread. I was going to leave them on forever. I'm planning on a cam and dual springs as a safety precaution. So single springs like 918s also wear out?

JL ws-6

iTrader: (50)

all springs wear out, with time, they actually "shrink", meaning if you were to measure teh height of the spring, then check it every 1000 miles say, you will notice that the overall uncompressed height will decrease. The more radical the cam lobe, the more this happens. As the height decreases, the seat and open [pressures decrease, allowing uncontrolled valve movement.

Even with a stock cam, 918's are a good idea simply because it will allow higher rpm's before valve float becomes a problem. Hell, 918's should have been the stock spring.

Any cam with a xer lobe, or an agressive ramp rate or high lift should have dual springs on them, and changed on a regular basis, say every 10 to 15K

cantdrv65

iTrader: (3)

918's or any other tool steel spring could never live up to stock longevity requirements. This is the reason GM went to lighter valves on the Z06....