95Lwind05

iTrader: (6)

I have a polluter cam, and as far as valve train goes I just bought some comp ultra gold 1.72 roller rockers. I was told with these rockers that I will most likely get valve float. I havent bought valve springs or pushrods, yet. From my understanding different pressure valve springs can help take away valve float. Is that true at all? Any reccomendations on what will help against would be great. Thanks in advance everyone!

Bouvs

iTrader: (12)

well if you put more pressure on your valve springs it should help prevent valve float however you will decrease your coil bind capacity aswell. Look at various springs find out what the coil bind lift is at certain psi's of pressure and go from there

SweetS10V8

iTrader: (4)

Who ever told you the rockers would cause valve float is iffy. Its all about the system, unless you have some severely heavy rocker arms and these are lightweight. Adding more spring load is a band aid, not an answer.

Tell us everything about your valve train so far. Plus specs for your cam.

95Lwind05

iTrader: (6)

K thanks!

id love to tell you the specs of the cam but probably shouldnt for now...its close to the hpe megadeath cam with out the split. The only things I've gotten for my valve train so far would be the ultra gold rockers. I was going to buy pushrods and valve springs next. Everything I have so far is in my sig. Everything else I need to buy yet.
Thanks for the info so far!

95Lwind05

iTrader: (6)

And sorry I put this in the gen 4 section...it should be in the gen 3 section

XtraCajunSS

iTrader: (2)

Those rockers are actually supposed to be very light at the tip. Comp is sending me a set to try and I plan on running them on my CTS-V which currently has our XTreme 227 camshaft (227/227 .639"/.639" 116+4) If I don't get valve float with this cam, I'll be pleasantly suprised... One variable which will make a difference in my case is I have an LS6 which has lightweight valves. I plan on trying them on a set of AFR's as well but I am looking for something with a VERY aggressive cam just to see what happens.

Shane

95Lwind05

iTrader: (6)

cool get back to me to see how it goes!

95Lwind05

iTrader: (6)

Bump for the day, id still like some more info on this.

bonestock99

iTrader: (1)

When you get springs you should also try titanium retainers. They will lower your chances for valve float by lowering the weight of your valvetrain! Just my .02

95Lwind05

iTrader: (6)

I was planning on going with the patriot dual gold springs, i believe they come with titanium retainers...thanks for the input!

SweetS10V8

iTrader: (4)

I dont think the rockers will have a huge impact on your valvetrain stability in this setup. That is an aggressive cam, 227(probably 270ish seat to seat) degrees isnt a long time to get to .639 and back again. Looks like an LSK lobe which were designed to kill valve springs. Those valves will definatly help.

Im sure youll get a good set of springs and set them up as well as you can. Let us know how it goes.

95Lwind05

iTrader: (6)

I wish I could put some new valves in, but I dont plan on being in the works for this year. Id rather wait and get some aftermarket heads next year.
I will deffinately be posting up my dyno numbers when shes done

95Lwind05

iTrader: (6)

bump...

fauslpss

iTrader: (6)

Call Comp and see, you could try a beehive spring the way there designed takes a lot of weight off the valve.

95Lwind05

iTrader: (6)

awesome idea, I will deffinately do that!

405HP_Z06

iTrader: (11)

This happens in many cases.

How do you know? Do you know the moment of inertia of these rockers?

Agree, but sometimes you have to do unconventional things to solve a problem.

405HP_Z06

iTrader: (11)

What is the lift? What springs does the cam vendor recommend?

95Lwind05

iTrader: (6)

I PM'd joey from tick the same question as this thread, and he never gave me a pm back. So I guess im going to have to give you the information you need to help me out..
.610/.612
They reccomend the Patriot gold duel springs.

405HP_Z06

iTrader: (11)

So with the 1.72 rockers, your lift would be .617/.619 based on .358/.360 lobe lift.

To keep the valve train as light as possible and still control the valve train, I would recommend:

Option 1:
136 lbs on the seat / 374 lbs over the nose
PSI 1511ML installed @ 1.780" - 66.4 grams
Comp Cams 772-16 or Katech titanium Retainers - 7.2 or 6.0 grams
Comp Cams 623-16 machined locks - 3.2 grams

Option 2:
143 lbs on the seat / 336 lbs over the nose
PAC 1518 installed @ 1.760" - 75 grams
Comp Cams 772-16 Titanium Retainers - 7.2 grams
Comp Cams 623-16 machined locks - 3.2 grams

I think Katech still has their 20% off sale going on, you can get a good deal on the PSI's and associated parts.

For reference here is the PP 8412:
144 lbs on the seat / 374 lbs over the nose
PP 8412 installed @ 1.770" - 94.2 grams
PP 8408 titanium retainer - 10.2 grams
PP 8406 machined super 7 locks - 6.6 grams

95Lwind05

iTrader: (6)

thank you very much!