MUSTANGEATER

iTrader: (10)

That's still a pretty safe margin, any specific reason why the being good to .650 lift isn't advertised then?

Also if you got a second mind helping me with a solid roller set of beehives and pricing?

Zach@Texas-Speed

iTrader: (7)

liability I imagine....not having to deal with people who push the actual limits, break something, and want comp to cover the fix

cyphur

iTrader: (10)

So why is it everyone I talk to about springs for my next cam(FM cam in the 23x/23x 59x/600 range) always points me in the direction of dual springs? I'd really like to run single springs if it'll hold that cam. I realize everyone has their preference, and sponsors want to make a buck, but even members are always biased towards duals. Would 918's w/tit retainers hold a cam of those specs w/cam motion lobes?

Unaffliated Racing

iTrader: (15)

If you look most of all springs are that way. You just have to look an the installed height and coil bind numbers. Then subtract .060" for safe clearence. That will be your safe max lift.


If you will read a warrenty card, it states that there is NO warrenty on race parts.


It's because of the first batch problem. Everyone including the shops are gun shy. These springs have been tested to the limits. Comp does more spring testing that Ford, Chrysler, and GM. I would put a 918 and a Ti retainer on that cam in a heartbeat.

99'Formula

iTrader: (7)

Torquer + 918's = no boom, plenty safe.

superslowjoe

I see that cam is on sale right now also, hmmmmmmm I WANT ONE, I have 918's in my car now, guess that would be a easy swap then.

greekss

yup.... as long as u have the other stuff.... timing chain and prods

Playdough

So after reading this thread, it makes me feel much more comfortable puttin 918's in my Goat with a 228/228 .588/.588 112 on an XE-R lobe. Thanks for the info guys.

Also one other thing, should I put Ti retainers on as well to help reduce valvetrain weight and help with spring life a little as well. Should I go ahead and change the timing chain as well, the car only has 2200 miles or so on it?

Unaffliated Racing

iTrader: (15)

Ti retainers would help and I would leave the stock chain.

C5 Purple Haze

I could not agree more. With all of the great dual springs that are now available. Why take a chance with a single spring.

Sanders

What does Allan at Futral tell you to run with that cam? If I had to guess, I would say he would tell you 918s would be fine. I would run what he recommends.


I installed a TR224 w/ 918s and Ti retainers and ran that for about a year. Then I installed a FM11 (228/230 .595 .595 112) and it has been in the car for about a year. I just left the 918s in there since Futral recommend them. The springs may have around 6,000 miles on them now and no BOOM yet!

Unaffliated Racing

iTrader: (15)

To each his own but, if we built to identical motors or even used the same motor..you use your dual..i'll use a 918...i'll out RPM you and probably gain a horse or two.

hoserack

My 422 has a 242/244 610/612 and I have the 918 springs.

The engine builder took me in the back and put a 918 in a vise.

He tightened the spring to the installed height.

He then put a caliper on the spring and began to tighten it down.

The spring went to .765 before coil bind.

I have almost 6000 miles on it now and last week after some tweaking got 478 rwhp and 480 tq.

That is on a stock TB and LS6 intake.

I bought the new Nick Williams 90mm TB last week and matching LSX.

I am hopeing for 510 RW with the new setup.

I'll post dyno #s when I'm done.

So to answer the spring question, mine work fine so far.

TVWilkes

Anyone that uses a 918 want to gain a few hundred more RPM?PRC now has a titanium retainer to fit the comp 918 springs.The price is very competitive.Call or PM for details.

Under certain conditions the single spring will eat up less HP than a dual.On lagre cams,the duals make me feel better.

BBADWS6

iTrader: (8)

My last cam had XER lobes and i ran 918s at .591 lift up to 7000 and had no problems. I say you will be fine.

BLUEBALLS ZZ

iTrader: (2)

don't let Anthony see you say that i can say this. it surprise's me that there are so many out there using 918's and not breaking. except Vince. you have nothing to fall back on if a single spring breaks. bent valve busted piston. etc. at least in most cause's when a dual spring breaks. you have the inner spring supporting the valve and your chance's of damage is way less. Mechman has broke a couple of the duals and the the inner spring was there to save the motor. he bought a heads from a car with 6 bent valve's from the top. car was in an really bad accident and the head most of impacted something that bent the top of the valves. so when you spend all the money on a built motor. why would you get cheap on springs and not go with something a little more dependable and safer.

PREDATOR-Z

But that is the catch, just how many properly installed 918 (blue) reports of broken springs do we see.
Very, very few, I can only remember 2 maybe 3 cases since the last 2 years, and none of these could prove they were installed at proper height and not just slapped in there.
As stated before the harmonics of that spring are amazing, high rpm stability is exceptional, and then weight. Why do most duals use titanium retainers? Because we all know that the lighter the valvetrain, the lesser the chance of valve float and the easier it is on the valves/guides/cups ESPECIALY with fast ramps.
I used to think the same, duals are safer. Untill I used the 918's and have seen them used on .600+ XE-R ramps.
I have no doubt in my mind that they are one of the safest, best, lightest, best springs designed so far.
And BTW at an average $168 for a set, they are not cheap.

AnthonyR

iTrader: (3)

It's only a bad thing when YOU say it Dave

jz06man

the 918 are ok for the lift... You will have to check them every 7500 or 10K...The 921 or Patriot duals would be better and you'll sleep better at tnight too.

BLUEBALLS ZZ

iTrader: (2)

if you use 918's, you'll be fine