SoCalDrifter

im just about to give up on everything this is the 5th time ive popped a rocker....its killing my track days...i just fully built the whole motor top and bottom end figuring everything will be perfect after that but nope still popping rockers....i have rocker arm stopper, TI dual springs and retainers, everything...

idk what the deal is any info can help....someone said my turbo hits to hard on the rev limiter so it keeps popping it but its a gt30.76R at 18psi idk what to do

Ka-t in progress

Where is your rev limiter set at?

hobbs

First thing would be to get rid of the rocker arm stoppers, if you keep spitting rockers you will damage your motor with a RAS installed.

e1_griego

Are you running AEM?

TheRealSy90

Get rid of the rocker arm stoppers.

Do dual rocker arm guides.

End thread.

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e1_griego

^ You always mention that. Details?

jr_ss

It's just taking the "guide" shim(one with the slot) and utilizing it on both sides of the rocker arm instead of one side with the completely flat one. Keeps rockers from kicking sideways, which is the major reason they fly off.

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My SR20VET

SoCalDrifter

7200

i thought it was better to have a RAS so it doesnt do as much damage if one were to pop off

ya aem v1

gunna look into those havent heard of them

TheRealSy90

You run a guide shims on both arms of the rocker. It's as easy as it sounds. Why bandaid the problem with stoppers that do more damage than good when you can fix the problem completely. You just have to machine the other arm of the rocker to allow it to fit inside the guide shim.

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e1_griego

Thanks for the explanation.

I have seen a lot of SR cars with AEM kick rocker arms -- maybe someone else can weigh in on the technical explanation.

SoCalDrifter

with or without RAS? wouldnt it be better to have RAS so incase it does break a rocker doesnt mess up the valves...seems like the dual guide shims is like its made to keep rockers from popping off...either way going to do this when i put it back together

TheRealSy90

The thing is, rocker arm stoppers usually just cause the rockers to snap when they decide to throw. But with dual guides you will not throw a rocker arm, so there is no use for the RAS. But it's up to you if you want to leave them installed, they just won't do anything.

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SoCalDrifter

o ok cool thanks for the help gunna do that later today

if anyone has any other ideas throw them out there im only giving this motor till the end of the month to shape up or its out of here hah

EDacIouSX

Wow, very interesting about removing ras.

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sil80dude

The guides for the rocker arms are all one size the shims are not! Its important to have those shims and have them be the right size for proper valvetrain wear. You should go solid lifters shimmed properly and keep the RAS

SoCalDrifter

going to try tomeis upgraded rocker arms and if after that it still blows those imma loose my mind

VNG704

Stupid question but I assume the shims are the correct sizes?

SoCalDrifter

shims are stock size on stock rockers

VNG704

Did you have them in order and put back with same rockers and guides that they were with originally? I'm just thinking it's possible the height is off which may cause them to pop. There is a variable difference in height that is okay, but it is very small. Do a search but I think within .025mm difference in height between a shim and that same rocker's guide is okay. If you didn't measure them then I would go back and measure before buying new things and hoping it solves the problem. Hope that helps.

SoCalDrifter

http://www.ebay.com/itm/TOMEI-SR20-D...c85f92&vxp=mtr

has anyone heard of this or used them before???

TheRealSy90

Here's the thing, all the guide shims are the same size, and since you want to do dual guide shims on all the rockers, you don't have to worry about mixing up the shims because they are the same size. The hydraulic lifter will take care of the MINUTE size difference between the guide shims and the flat shims. Trust me, i've done it before and it works flawlessly. If you are really that anal about it, get the guide shims matched to the thickness of the flat shims that you are replacing, one by one. Remember, you have to shave the outside left arm of the rocker so that it fits all the way into the guide shim. It's honestly super easy to do.

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santasnowman

Buy a VE head. Problem solved. :P

SoCalDrifter

whats all done to your SR? have you popped/broken a rocker since you've done the dual guide shims? ive been thinking about doing that but one of my friends thats been workin on SRs for awhile doesnt like the idea this is the only place ive heard of it being done

alittle late for that now ive already built the whole head id just be dropping another 2.5k to do that.. id rather put a V8 in and sell the whole SR

tommyboi

Have you shimmed your head properly with a shim plate(Kent Moore plate, I have one and would sell it if needed) or something like the rps sport shim tool with dial indicator? Also are your hydraulic lifters bleed correctly and not worn out? Did you get a valve job done and they did not check valve stem height? Are you running big cams with aggressive lift with soft valve springs? All of this could be your problem.

If memory serves me right, each shim just has to be leveled with the right side of the arm for each rocker arm.

There's a bunch of crazy things you can do like the mazworx valve stem conversion, idea behind is that less mass = less force.

I have not had a problem with my built head. But I'm not running anything crazy... I hit the rev limiter quite a bit also.

Super tech beehive dual springs [email protected] with titanium retainers.
Super tech valve stem seals
Hks 264 step 1 in/exhaust
Nissan oem valves
Nissan oem rocker arms
Valve guides re-sleeved with liners
3 angle valve job and shimmed with Kent Moore plate.

SoCalDrifter

ok so after a few days of looking around on what to do im gunna start out by doing tomei solid lifters with the test shims to make sure everythings perfect and even and then im gunna take it out and drive it.... if it blows a rocker again then ill do the dual guide rocker mod thingy and then take it out after that... if it does it after thati give up

Drakkar

You can order guides in different thicknesses. I am running a solid set up with dual guide conversion. I had my valves tipped so all of my guides were the same size. When you go to do it just make sure you measure the valve lash correctly. There is a thread on this website for it. You will find that each guide maybe a different size. That is OK as long as they are within tolerance with the base circle of the cam on the rocker.

Here is a link for guides. You can find them cheaper if you look around.

Just have the machine shop match the relief cut on the other side of the rocker.

http://www.frsport.com/Nissan-13218-...m_p_60078.html

SoCalDrifter

just ordered the mazworxs dual rocker arm guide conversion kit with brand new rockers already grinded down so this motorfucker should be bullet proof

i should be all done and running it next weekend ill let you guys know how it goes

SoCalDrifter

ok so i got the solid lifters and new rockers w/ dual guide shims in and the lifters are really loud and i think there especially loud since im running lash type cams on solid lifters so im gunna order the right tomei 270 cams and get it all tuned up and go beat on her...hopefully she can take it otherwise the SR

TheRealSy90

I don't understand why you did solid lifters if you also did dual guides. Go back to the hydrolic lifters and you won't have all that valvetrain noise... Solid lifters are a waste of money with no performance benefit.

Also, i'm curious how much mazworx charged you for machined rockers and dual guides. I do it locally for people for 20 bucks lol.

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SoCalDrifter

i did both so ill never have to worry about rockers ever blowing up again.....ever.... it literly happened everytime i went to the track my turbo just hits really hard at redline so thats why I didnt think the hydrolics could handle it and its says the solids are made for high reving and thats exactly what im doing so seemed ideal.... and mazworx was only 70 people around here havent heard of it or thought it was sketchy so i didnt trust them and just went with the people who know to do it right