If you've broken a Comp 918 bluestripe, come in
06-17-2004, 02:30 PM
#1
If you've broken a Comp 918 bluestripe, come in I keep hearing you need to replace these springs every 15k miles, but I think that is BS. It is all dependant on how you heat cycle them, how much lift your cam has, how high you rev, the specifics of your valvetrain, etc. I think that if you've broke a spring it would have probably been sooner rather than later.
So if you're broken a Comp 918 bluestripe, please tell me how many miles were on it, the lift of your cam, how high you rev, and all the valvetrain specifics. I want to put an end to this myth.
So if you're broken a Comp 918 bluestripe, please tell me how many miles were on it, the lift of your cam, how high you rev, and all the valvetrain specifics. I want to put an end to this myth.
06-17-2004, 02:38 PM
#2
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Spring breakage isnt the only concern with springs. After a while, they become fatigued and will induce valve float...while I have 25k or so on my 918s, they are still going strong. I'm going to replace mine this year. Not sure if I'll stay 918s or go Crane or Patriot duals, but thats because the heads are going to be off anyway with the valves out.
06-17-2004, 03:04 PM
#4
10 Second Club
Brad makes a very important point. Spring life ends when the spring no longer meets specifications, not when it destroys your engine! Also, spring longevity is greatly reduced by higher valve lift. While valve lifts approaching 0.600 inches are no longer considered extreme for these engines from a performance viewpoint, such high lifts and their associated steep ramps are very hard on valve springs.
Last edited by Gary Z; 06-17-2004 at 03:17 PM.
