Valve Spring Help!!!!
Valve Spring Help!!!! My brodix Ik200 heads came with Comp Cams 987 dual springs on it, My cam recomended the use of the comp cams 986 dual valve springs, the 987's have alittle more lbs so i thought i would be fine with this, My problem is i cant rev over 5500 it keeps floating the valves at that rpm and i dont know why the heads were already pre assembled when i got them but i dont know why it is doing this 
any help would be appreciated my cam is a hyd tappet Comp cam .507 intake .510 exh. 240 dur intake 246 exh dur, 110 lsa, with comp cam 1.6-1 fully roller rockers help please 
any help would be appreciated my cam is a hyd tappet Comp cam .507 intake .510 exh. 240 dur intake 246 exh dur, 110 lsa, with comp cam 1.6-1 fully roller rockers help please 
Launching!
Joined: Apr 2007
Posts: 264
Likes: 0
From: College Station, TX
You could get the recommended springs, but I would try something else. I'd call up Comp Cams and ask if some of their Beehive springs would work better. Beehive springs help to eliminate vibrations at high RPMs and, combined with light rockers, can increase overall hp, especially in your highest RPMs.
It's like this. A dyno graph of a normal engine goes down at the highest RPMs (due to vibration of the valve springs). A dyno graph of an engine with a lightened valve train goes up all the way to the redline. That means it pulls more hp up there. This can also help increase the RPM range (move red line up). I'll also help with throttle response since you have less mass (rockers), but not much, so don't expect the world.
It's like this. A dyno graph of a normal engine goes down at the highest RPMs (due to vibration of the valve springs). A dyno graph of an engine with a lightened valve train goes up all the way to the redline. That means it pulls more hp up there. This can also help increase the RPM range (move red line up). I'll also help with throttle response since you have less mass (rockers), but not much, so don't expect the world.
Originally Posted by My01SSCamaro
ive looked at the beehive's but i cant find one thats the right diameter my springs now are 1.430 od, if i go smaller do i need a spacer or something along those lines?
Check out this article, they did the same swap:
http://www.chevyhiperformance.com/te...e_spring_tech/
In order to run beehives on ik200 heads you will need the following.
26918-16 springs
795-16 retainers
4705-16 spring locators
614-16 10* locks +.050" installed height
ditch the factory shim under the 987's and you'll have to pull the blue valve seals off to get the locator installed onto the guide then just put a little oil on it and slip it back on. with the parts above you should end up with a 1.8" or so installed height.
it should also be noted that the +.050 valve locks will require you to run a rocker arm that is non self aligning
if all goes correctly it should look like this.
26918-16 springs
795-16 retainers
4705-16 spring locators
614-16 10* locks +.050" installed height
ditch the factory shim under the 987's and you'll have to pull the blue valve seals off to get the locator installed onto the guide then just put a little oil on it and slip it back on. with the parts above you should end up with a 1.8" or so installed height.
it should also be noted that the +.050 valve locks will require you to run a rocker arm that is non self aligning
if all goes correctly it should look like this.
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Going through something similar with my 355 SBC boat engine. I'm running Isky 6105 springs which are similar to your C987's, hyd roller 224/230 .537/.511 112LSA. I've been advised by a few engine builders to shim the spring pressure up to around 150 on the seat and 350 open to take care of the problem. However I am only going to be spinning 6K rpms max. If you are planning to go higher which I assume you are with that cam then you'll probably be better off with the 918 beehive conversion.
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Originally Posted by ws6t3rror
In order to run beehives on ik200 heads you will need the following.
26918-16 springs
795-16 retainers
4705-16 spring locators
614-16 10* locks +.050" installed height
ditch the factory shim under the 987's and you'll have to pull the blue valve seals off to get the locator installed onto the guide then just put a little oil on it and slip it back on. with the parts above you should end up with a 1.8" or so installed height.
it should also be noted that the +.050 valve locks will require you to run a rocker arm that is non self aligning
if all goes correctly it should look like this.
26918-16 springs
795-16 retainers
4705-16 spring locators
614-16 10* locks +.050" installed height
ditch the factory shim under the 987's and you'll have to pull the blue valve seals off to get the locator installed onto the guide then just put a little oil on it and slip it back on. with the parts above you should end up with a 1.8" or so installed height.
it should also be noted that the +.050 valve locks will require you to run a rocker arm that is non self aligning
if all goes correctly it should look like this.
Hey Ws6T3rror how do you like your ik 200's ? what kinda power you makin with em
if i was you i'd just run the 918's the pressure difference is about 15 psi on seat between them and the 915's and you'll actually get a good pressure over the nose with them with your lift vs the 915's.
as for how i like them i havent got the motor in the car yet (32 chevy roadster pro street). i'm still tweaking it on the dyno and gradually its becoming a very hard running piece.
360 sbc (.060 over 350) forged flat tops, gm steel crank, compstar rods, 4 bolt mains. ik200's beehives, super victor, 950 hp holley dp on the dyno, custom stainless headers built by me. custom cam i spec'ed 234/239 108lsa+1 .597/.605 lift 10.75 comp. so far after some tweaks and intake manifold work 522fwhp @ 6600 452fwtq @ 5200rpms.
as for how i like them i havent got the motor in the car yet (32 chevy roadster pro street). i'm still tweaking it on the dyno and gradually its becoming a very hard running piece.
360 sbc (.060 over 350) forged flat tops, gm steel crank, compstar rods, 4 bolt mains. ik200's beehives, super victor, 950 hp holley dp on the dyno, custom stainless headers built by me. custom cam i spec'ed 234/239 108lsa+1 .597/.605 lift 10.75 comp. so far after some tweaks and intake manifold work 522fwhp @ 6600 452fwtq @ 5200rpms.
so if i get everything you listed above i souldnt have to shim the springs up? just wonderin that way i dont orded shims if i dont need em. thanks alot for the help, keep me posted on how you like your heads, im takin mine to the track once i get this whole problem figured out
