RedDemonLsX

iTrader: (2)

I snapped a rocker somehow and thought id show you guys the pic of this...Any idea on how this could happen??

Darkman

iTrader: (2)

How much open valve spring pressure are you running?

RedDemonLsX

iTrader: (2)

Not sure..Mods are in sig and springs were provided by tea assembled on the heads.Cam is a T2 and i myself didnt tune the car

ZeeOSix

Look very closely at all the others for stress cracks in that failed area. As Darkman is eluding to ... could be too much spring force. If all the others show no evidence of stress cracks, then it's possible there was a flaw/stress riser somewhere in the one rocker that failed. In either case, I wouldn't trust any of them at this point.

RedDemonLsX

iTrader: (2)

The rockers have been on the car about 4 years now.The rockers ( the 2 pictured) have since been replaced but car die's out when i come to a stop and it just sounds different,the guy who replaced them said my idle problem was tune related and or bad spark plugs and wires..in any case,it runs like crap now...not sure what to do

RedDemonLsX

iTrader: (2)

Could i be down a cylinder somehow?? i always had a small idle problem but its 10x worse now,he had mentioned i could be down a cylinder

Darkman

iTrader: (2)

If have not done so already, I would pull the valve covers and check for another broken rocker, bent pushrod, etc. Assuming the valve train is intact, the idle problem could well be tune related. In any event, I would have no confidence in the rocker/valve spring set up with the history of broken rockers.

RedDemonLsX

iTrader: (2)

Ill get the covers ripped off after work tomorrow and check for anything else...Before the breakage i did have a weird idle problem upon cold motor or hard braking it would like to die.Its just its 10x worse now.Would a bent push rod cause such crappy idle?...The car drives once its going its just feels like its down alot of power...

Darkman

iTrader: (2)

The list of things that can cause a bad idle is pretty long, including for example a vaccuum leak, a bad misfire in one more cylinders (plugs, wire, injectors), the tune, or internal mechanical issues related to valve operation or cylinder compression.

vettenuts

iTrader: (4)

If you broke the rocker, I would also check for a bent valve as the source of your poor idle quality.

A number of things could cause that failure including bouncing the valves (weak valve springs, over rev, etc.), bad geometry (poor wipe pattern), too stiff a spring (previously mentioned). You should try to figure out the cause before it happens again with potentially worse consequences.

2000RATA

Four years of use is pushing it. I'd replace springs and rockers. And look for that bent valve.

quik95lt1

iTrader: (7)

wondering if you bent a pushrod then the extra lash in the system beat the snot out of the cup of the rocker and eventually it broke.........or possibly you smacked a valve intern pushing the rocker back through lash area and smashing the pushrod......out of curiousity was it an exhuast rocker??

need4z

iTrader: (5)

Anyone know the max open pressure that the hs rockers can safely handle?? Even the YT cant handle safely more than 400 lbs open lift. I think thats why soo many have failure. Doing tons of research here today.

427

iTrader: (3)

I have run the HS at 450 open with good results on a drag engine.

Kurt

need4z

iTrader: (5)

Good to know.. Ever broken one on that motor?

TransAmcoupe98

iTrader: (10)

Looks like there was a little more pressure towards the inside of the rockers looking at the break.

427

iTrader: (3)

No. It was originally run by Mark Koehler, then Ray Litz. Not sure who will run it next.

Kurt