This may sound like a retarded question but I just need to throw it out there if anyone has the info to this. Im going to be using CRANE 101-0014 (grind ACU-261-2SR-11) turbo cams in my new build. None of their cams exceed a certain amount of lift that should be a problem with factory springs, but in all of their valve spring recommendations they say the following... "Use new valve springs." or "Fresh stock valve springs ok.".

If i do need a fresh set of springs, i noticed that sealed power springs part# VS980 ( DOHC engine; Loc. Int.; 1.676" Free Height) http://www.summitracing.com/parts/SLP-VS-980 Retail for 5 bucks a piece on rockauto.com. Thats a wholeeeeeeeeeee lot cheaper then going with valve springs from supertech for 350, considering it seems to be not required in my application (especially since im not revving any higher then 7k).


Im wondering if it is more or less seat pressure then the factory springs?


Edit: that was actually easier to do then i thought, but the information is vague, and now to compare against OEM springs....

http://info.rockauto.com/SealedPower/VS980.html

Open Pressure: 83
Closed Pressure: 41

 

$5 bucks each??? i would be fearful....you get what you pay for.

 

why are you using those outdated cams?

secondly it's hard to say how fast they ramp up. really aggressive lobes will require more spring than slower lobes. your best bet is using their recommended spring or matching the seat and open pressure of the rec spring to a similar one

 

well ive used sealed power products many times before with engine building, so quality really isnt something im concerned about here, its the pressure of the spring


outdated? what other cams are there betsides the brian crower FI cams and the crane FI cams? and thats the thing, their spring recommendation is "fresh stock" so...lol take that as you will, i would glady get a set of the sealed power springs if they meet or exceed OEM pressures.

 

and here is the info i found on the pressures

http://info.rockauto.com/SealedPower/VS980.html

i just dont know how that compares to stock

 

only thing ive been able to find thus far is the free height on new springs according to the service manual

1.668 on the intake
1.854 on the exhaust


free height on these springs are 1.675 so they are in fact longer then the OEM's on the intake side.

 

look at the forced induction dynos, pro 1s have been one of the nastiest cams for big hp numbers. itr cams are another fav. in many cases the consensus was that "turbo cams" aren't worth the money.

you could buy itr cams, use cam gears and tighten up the LSA if you wanted less bleed off and still spend less than cranes. the other issue with aftermarket cams is construction and lobe design. crowers are famous for breaking and crane/comp in some cases make less power than stock.

the free height isn't a concern since it's set in place with the retainer, springs have to be slightly longer or they would flop around like a dead fish

i can't remember the spring pressures on type r springs but you could probably google it. the other thing to consider with off brand springs is if they use the same retainers or locks

 

wait a second those aren't even vtec cams. please tell me you're not spending $500+ dollars on cams for a LS?

that bottom end will fail before you run out of turbo if you choose a decent snail.

go grab something like a precision 5431b and bolt it on with a good manifold. you won't have any trouble with power production