I was wondering if there are any pitfalls with a low pressure valve spring like the Omnipower or RM Gen IIs? Is the 55lbs they provide enough for the bigger cams like the BC Spec Vs, Skunk2 Stage IIIs, etc? What about operation beyound 9500 RPM? Or even in an application that continuously lives in the upper RPM range (i.e. road racing)?

I was curious about this because all the other spring manufacturs (including Eibach, Crane, Crower, etc) have seat pressures considerably higher for their "race" cams. So I wondering if the Omnipower and RM springs should only be used for street cars (where the lower seat pressure would help in valvetrain/camshaft wear and reliablity) and not neccessarily race applications.

Now I am fully aware that people have run both these springs with "no problems" and that they have also hit "10k+ on a misshift and still running ." That is not the question or what I'm talking about. If that is going to be your response please reread the question.

 

The RM G2 Springs were designed in response to most people wanting a softer spring.

The 55lbs on the seat is about the absolute minimum we felt would be safe for most motors to 9500 rpms with most cams.

I personally like more spring pressure like the RM G1 springs. We have tests planned to see wether we can make more power with stiffer G1 Springs v. ligher G2 springs. If my hunch is correct, the result may be some what shocking.

If you want ~75lbs on the seat we have a special combo for that as well.

 

which would be best for something like the buddy club 4's rocket?

 

supertech

 

I like our stuff, Omnipower, and Supertech.

I would go with a spring that gives you over 70lbs on the seat and over 220 at 0.500" if you want to run BC4's and run them to 10k.

 

yep thats what im about to do

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">The RM G2 Springs were designed in response to most people wanting a softer spring.

The 55lbs on the seat is about the absolute minimum we felt would be safe for most motors to 9500 rpms with most cams.

I personally like more spring pressure like the RM G1 springs. We have tests planned to see wether we can make more power with stiffer G1 Springs v. ligher G2 springs. If my hunch is correct, the result may be some what shocking.

If you want ~75lbs on the seat we have a special combo for that as well.</TD></TR></TABLE>

if you dont have cams that require the stiffer springs, arent you going to lose power due to drag?

 

You would think, but I think I've seen otherwise. But it's hard to tell from in car observations.

 

That would make for an interesting dyno test.

I’ve got the shotpened omni springs and Ti retainers in my car right now in preparation for my cam. Currently have B16A2 cams in there, so I’ve always wondered how much power that’s eating.

 

Good discussion so far. I started not because I believe the 55lbs Omnis and RMs are bad (in fact I think if you run a street car with a non-race cam you should use these to cut down on valvetrain wear and longevity) I was wondering if there is reason for all the other companies to use such high seat pressures.

Crane, Comp, Crower, etc all use markedly higher spring pressures. And I do not think they should be written off because they are "domestic companies" and "they don't know any thing about V8s." These guys helped get V8s from 16s to high 3s in the 1/4. I wouldn't write them off in contributing some good ideas to the sport-compact arena.

 

Maybe we can continue this with a discussion of which material is best for a certain application. I've heard H-11 Tool Steel is good for longevity and high RPM race applications but I've also heard that Chrome Silicon has a longer life and is less susceptible to fatigue.

The biggest confusion I've seen is in Lunati valvespring ads. Some of their ads state H-11 is better than Chrome Silicon and some are the exact opposite saying H-11 is old tech and Chrome Silicon is the wave of the future.

EDIT: Found the Lunati ads.

H-11 is better: http://www.holley.com/HiOctn/P....html

Chrome Silicon is better: http://www.holley.com/HiOctn/P....html

 

Seat Pressure doesnt affect power much ........the cam is on the base circle then..

open or Nose pressure is what affects power

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRANE CAMS &raquo;</TD></TR><TR><TD CLASS="quote">Common Misconception:
Many people mistakenly think that using higher seat pressures causes a reduction in the horsepower delivered to the flywheel because higher seat pressures (and also higher spring rates required for high performance) require horsepower to compress the springs. This thinking is simply incomplete! For every valve that is opening and its valve spring being compressed, another valve is closing and its valve spring is expanding. This expansion returns the energy to the valve train and the engine. This results in a net power loss of "0" hp. Many engineering texts refer to this as the "regenerative characteristic" of the valve train. Recent tests at Crane have shown no horsepower loss on a hydraulic roller equipped engine when changing the seat pressure from 135# to 165#. Power actually improved significantly at top end, probably due to better control of the relatively heavy valves in the engine. </TD></TR></TABLE>

Directly off the crane technical website

 

So the RM G2 springs would be adequate for an engine that probably won't see anything past the stock rev limiter (8200) no matter what cams are installed?

I ask because I have a B16 and I'm looking to run the S2 Stage 2 cams (exact copies anyway) and CTR pistons but I don't really want to rev past or too much past the stock rev limit. Would these be adequate for my engine?

 

Good to 9200rpms on most cams.

 

Mr. Tbone has the Rm gen 2's in his car. This guy has dyno'd about every damn camshaft under the sun, and has ran his BC 4's to 10k, has tested the BC 5's, S2S3's yadda yadda yadda. Bottom line, the RM is the best valvetrain that money can buy. You will <U>never</U> have an issue with Rockets valvetrain, it has been proven over and over again!!