biggest cam on evo springs/retainer

[mysticj]

What are the biggest cams to run on stock evo springs with max redline of 7200? FP2? HKS280?

 

[BogusSVO]

I am not a big fan on the evo spring.

Read this thread, post 19 talks about the evo spring

http://www.dsmtuners.com/forums/newbie-forum/341209-4g63t-valve-spring-info.html

I doubt the evo will take a 280 cam

 

[asrdave]

HKS 272 is OE spring compatible or so it claims ... but better being safe then sorry .

 

[bastarddsm]

I wouldn't run evo srpings in a dsm with hks272's especially without checking retainer to seal clearances, and installed heighth. Mine had less than 0.01" with delta 272's and knocked the seals out the first time I went 7500rpm with it. I'm running stockers to 8000rpm with no aparant issues

 

[jpmxrider489]

No matter what cams you get it is reccomended to get stiffer springs. If you get 272s you dont have to upgrade springs.

 

[knochgoon24]

I am not a big fan on the evo spring.

Read this thread, post 19 talks about the evo spring

http://www.dsmtuners.com/forums/newbie-forum/341209-4g63t-valve-spring-info.html

I doubt the evo will take a 280 cam

Is it the pressure at .410 lift the bothers you?

What about the fact that the retainers only weight 3.9g and the springs are 30% lighter with a semi-beehive?

Evo springs and retainers 686.4g.
DSM springs and retainers 1120g.

You shave almost a lb out of the valve train.


I'm genuinely curious. I'm running Evo springs and retainers, and if they aren't going to hold up to 8k on FP2's, it would be really nice to know before I run the engine that far.

 

[kchaazz]

Regarding the seal clearance, FFWD sells a set of seals that will clear just about any spring, and they are cheap, just look em up on their site.

 

[BogusSVO]

With valve springs it is not the duration of the cam that concerns me, 272, 280,264, but the net lift of the cam. .500 or 13mm.

Duration is how long the valve stays open.
Lift is how far the cam opens.

http://www.dsmtuners.com/forums/newbie-forum/341209-4g63t-valve-spring-info.html

from post 19

EVO
Coil Bind
1.035
60
1.095 SAFE
1.560 = 65lbs
.030 shim
1.530 = 72lbs
.410 will be used to simulate cam lift
1.120 = 154lbs

so of coil bind is 1.095
and an installed height of 1.560 @65lbs

You have a max lift of .465 or 11.81mm

Now if you use the the .030 shim so the installed height is now 1.530 @72lbs
you have a max lift of .435 or 11.04mm

I know it is common to talk about the duration, but it lift we need to talk.

The cams you want to run are what lift?

Another couple things,
Why are the evo boys pulling these springs off? they are upgrading too.

I do not like the alum retainers, it was tried and discarded back in the 60' and 70's on domestic V8s
You start getting much spring tention on the retainers they chaff and flake. (Now think why you have that steel spring seat on top of the soft alum head?)
The hard steel locks "wedge" thu the retainer and can split them.

That is why we have Ti retainers now, stong and lite!

From my point of view as a machinist, other than a box stock use, stock cams, valves ect will be fine.

But if your going to get some decent cams, put a decent spring set upon the head.

But running evo stock spring 8k rpms, you can. I will not.

Personally I would like to see 90-100lbs @ 1.575 installed height.
Run a spring at 90% or more of it lift, you will get decent life out of it.
Run that same spring at 70% last about forever.

If given the choice of evo springs and retainers or aftermarket BC springs and STOCK 4g retainers.

Ill go the BC springs and stock retainers everytime.
More seat pressure, more lift value and a stronger retainer.
About the same money spent.

 

[knochgoon24]

I bought mine when Evo springs were $40 shipped from most people. So it's almost no waste of money for me if I should just toss them. I just don't want to spread bad info.

 

[donniekak]

I'm not a fan of evo springs either. I took 32 of them to the machine shop to check them. Only 3-4 of them were even close to being in tolerance for new dsm springs. Maybe when they are new they are ok, but who on here is buying new stock evo springs?

 

[BogusSVO]

I bought mine when Evo springs were $40 shipped from most people. So it's almost no waste of money for me if I should just toss them. I just don't want to spread bad info.

I just dont want to say trash them, but for what you are doing, get something better.

Maybe One the N/T guys with a stock cam set up may be able to put them to use.
As long as the spings check out

Use them on a "granade" engine build.... those are fun!!

 

[mysticj]

Having the head rebuilt but running Delta 272/264 on a 10.5:1cr 2.4L. Redline is at 6500rpm. Delta 272 has 9.8mm lift and the 264 has 10mm.

 

[BogusSVO]

Having the head rebuilt but running Delta 272/264 on a 10.5:1cr 2.4L. Redline is at 6500rpm. Delta 272 has 9.8mm lift and the 264 has 10mm.

9.8mm x .03937=.386 lift
10mm x .03937= .394 lift

From the other math if you set the springs up at 1.530 @72 psi
you should be alright.

You will be working the sping around 89%

As long as the machinist that assembles the head properly and checks all the main points.
If he dose not, then the engine will rev really lazy. Throttle respones will be nushy and not crisp.

 

[mysticj]

9.8mm x .03937=.386 lift
10mm x .03937= .394 lift

From the other math if you set the springs up at 1.530 @72 psi
you should be alright.

You will be working the sping around 89%

As long as the machinist that assembles the head properly and checks all the main points.
If he dose not, then the engine will rev really lazy. Throttle respones will be nushy and not crisp.

what main points? planning on installing the valve springs myself. thanks for your input.

 

[Armandotech]

We used the evo springs and retainers on our 1g project with hks 272 cams and revved the car to 8200 rpms without a single issue.