Okay if someones already done this I'm sorry but what are the particulars on this. It sounds like maybe the boost overwhelms the springs pressure and someone said the springs need to be shimed to have enough pressure on the seat.
It seems to me the right way is for Brian Crower to send everyone who purchased his springs a note and bring them up to date on the situation and explain the proper way to deal with this or dispute this talk that may or may not be true.
Manufacturer's can't make a marginal valve setup live a long and happy life.
If it is surge then no manufacturer can save bad setups.
Can't help one overrev event.
If there is no valve spring problem then I appologize to Brian Crower for even starting this but a lot of people are going to run more than 25 or 26 psi.

EDIT: This is added, this bent valve problem was with using CROWER springs NOT BRIAN CROWER springs and the cause is unknown at this time.

Charliew

People are running >25psi on the stock springs... so what is the issue with running Crower springs, when they are supposed to be stiffer/stronger?

i just hope they can take my stage 3 cams with out binding or anything....
my set just came in for my build

I already contacted them, and they stated that they are not aware of any problems... :huh:

I am going to set mine .060 above coil bind and see what the spring pressures come out to be...

I hope this is just a rumor. My BC springs shipped out today and I plan on running above 30 psi......

well just got off the phone with Dustin @ BC. He should be on here shortly, as he requested links to the discussions. Still waiting for answers from Fred as to whether he's on the Crower or BC spring (they are different).

David, I'm still a bit worried (just because of rpm, cam and boost pressure) too and will be shimming about just above coil bind.

well just got off the phone with Dustin @ BC. He should be on here shortly, as he requested links to the discussions. Still waiting for answers from Fred as to whether he's on the Crower or BC spring (they are different).

David, I'm still a bit worried (just because of rpm, cam and boost pressure) too and will be shimming about just above coil bind.

wow that was pro-active of you! Do you have multiple connections now because of your monster build?

wow that was pro-active of you! Do you have multiple connections now because of your monster build?

:lol: I wish...I can dream though. Maybe once they are done and I start racing Time Attack and NHRA they'll wanna help :p

With crower(not BC) stgIII and BC springs and retainers I had no problems at 7500rpm and 25ish psi on gt4088r. When I get up to 35psi I will let you know. :)

Alright. I had to go back and find my invoice for all this. Cams are Crower S4's. intake and exhaust valves were BC. Springs and retainers were in fact CROWER, not BC. Part number 84185. I was told they are the same tho. They do call for the same set up tolerances and pressures, yes? I never had an issue driving around on 22psi. It was only when I turned it up to 28psi that this happened. Thing is, I wasn't anywhere near 7800 rpm when the motor let loose. I was in the 5,xxx somewhere.

With crower(not BC) stgIII and BC springs and retainers I had no problems at 7500rpm and 25ish psi on gt4088r. When I get up to 35psi I will let you know. :)

Turbo shouldn't matter,right? Pressure behind the valve is pressure behind the valve.

It shouldn't be too hard to calculate how much you need to shim the springs if you know the spring rate and the force applied to the valve by boost. Just take valve areaXboost pressure and get X. then take your spring rate in Lbs/Inch and divide by X pounds and you should know how much you need to shim your intake/exhaust valve springs to compensate for the force applied by boost pressure. Just be careful, and add the shim height to the lift height of the cam and make sure it will not reach coil bind. This should work ASSUMING the specs Crower/BC gave us are correct.

I just got off the phone with David Crower again and he told me to set the install height to 1.315. This will have seat pressures at 90lbs and 170open. I then asked two questions:

1)Will this be enough to with stand 35psi.

2)Is this enough pressure to wipe a lobe.

answer to both. "I don't know."

Not too promising. Pretty much try it and see. Maybe I should have asked if he wanted to "try and see" on his dime. He also got off the phone before I got the chance to see if he'd throw me some new valves. Guess I'll try and call back.

yeah, BC called me back after having read the threads. They wanted me to make clear that the crower and BC springs are in fact different and produced from different locations.

Also found out a fun fact about some new goodies coming out. Maybe they'll want to help the build...? ;)
I'll also say that the answer you got from David Crower doesn't suprise me at all.

so the conclusion to this is what? bc valve springs wont hold up?

so the conclusion to this is what? bc valve springs wont hold up?

Well stock springs will hold 35psi and these are stiffer. I would think there wont be a problem unless people are aiming for huge lift or really high rpm.

thanks man. bc i just ordered these and really dont wanna send them back. i plan on doing 272 lift and up to 8000 rpms. so if they work for that then perfect.

thanks man. bc i just ordered these and really dont wanna send them back. i plan on doing 272 lift and up to 8000 rpms. so if they work for that then perfect.

272 is your duration, not your lift.

272 is your duration, not your lift.

;) He has really big cams. 272mm of lift! :lol: Can you say coil bind...