Pontiac Grand Prix Forums : Grandprix

my er rockers are arriving tomorrow on my door step!!

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http://www.cardomain.com/ride/2556536 NKG Iridium Plugs, 8mm Spiro Wires, ZZP Reprogrammed PCM, ZZP 3" full cat, ZZP Ceramic Coated Ported Manifolds, ZZP HV3, ZZP HVTB, ZZP ER Ratio Rocker Arms, ZZP Drilled 180* Thermostat, MotorSports Performance Intake, Reptile's IAT and dezldave tuned

Nice! Did you buy springs, too?

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2004 Impala LS - got some mods sold!!!
2009 Subaru Impreza WRX STI

NAIOA moderator Still Imp'n, just in a different Imp.

i dont have to worry about packages from zzp ariving on my door step, i can just walk in hah, but congrats! im sure you like it. oh and good luck with the install.

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Jeremy Exiled Vice President-2000 Silvermist-

Damn you again!

i know i cant wait...no zzp said i dont need to get springs, said i would be fine, but maybe sometime down the road i will anyway..

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http://www.cardomain.com/ride/2556536 NKG Iridium Plugs, 8mm Spiro Wires, ZZP Reprogrammed PCM, ZZP 3" full cat, ZZP Ceramic Coated Ported Manifolds, ZZP HV3, ZZP HVTB, ZZP ER Ratio Rocker Arms, ZZP Drilled 180* Thermostat, MotorSports Performance Intake, Reptile's IAT and dezldave tuned

Everywhere I've read you should use 105# springs on the intake valves with the ER rockers.

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2004 Impala LS - got some mods sold!!!
2009 Subaru Impreza WRX STI

NAIOA moderator Still Imp'n, just in a different Imp.

i have the ER rockers for over a year now, i shift @ 6000 and i have not changed the valvesprings. 105's are not needed for these springs, this isnt a high revving DOHC motor so i dont see the point of revving this engine to 40,000 rpm with just rockers and springs as a valvetrain upgrade. the LS engines run 90* springs and make over 400hp why would a piss ant 3.8 need a giant valvespring for? valve float? soon as a valve floated the motor would blow. valves dont just float one time and go back to normal, more Grand Prix forum urban myths.... install your rockers, make sure you clean the oil out before you torque down the bolts and enjoy your new top end
/thread!

Ummm Valve float won't necessarily kill a motor. If the valve does not contact the piston nothing really happens.

Aren't the ER rockers modified stock rockers? If so then I am sure it is just like the modified 1.9s. You don't need springs with them because they flex so much at higher rpms causing you not get the full affect of the 1.9s. If you went with a higher strength 1.9 I would get springs.

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Red 2dr 99 GTP "Old setup" Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

"New Setup" Back to stock

yeah well i asked zzp and said i dont need springs and my stocks are fine...but like i said maybe down the road sometime ill get springs...but if they say my stock ones are fine, then i am going to stick with what they said and save my money..

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http://www.cardomain.com/ride/2556536 NKG Iridium Plugs, 8mm Spiro Wires, ZZP Reprogrammed PCM, ZZP 3" full cat, ZZP Ceramic Coated Ported Manifolds, ZZP HV3, ZZP HVTB, ZZP ER Ratio Rocker Arms, ZZP Drilled 180* Thermostat, MotorSports Performance Intake, Reptile's IAT and dezldave tuned

That's a terrible comparison. There's more to it than just seat pressure. There's spring rate, lift, how heavy the valve train parts (valve, rocker, pushrod) added are, etc. That's like saying "a motor cycle can get away with two-cylinders! Why can't we?"

No, they don't just "float one time and go back to normal". Valve float doesn't instantly destroy the motor. I've worked on LSx engines that have valve float already (from certain mods) and we worked to fix it. The intake valve can simply close halfway during the compression stroke. That causes no chance of piston interference but you lose chamber pressure because you were pushing air out of the valve when it should've been closed.

Point is, you could have valve float and not even really know it.

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2004 Impala LS - got some mods sold!!!
2009 Subaru Impreza WRX STI

NAIOA moderator Still Imp'n, just in a different Imp.

Okay, I found the post where Wizbang (the main guy who developed the ER rockers) recommends not using stock springs unless you keep the stock shift points. Anything over that he recommends using a better spring on the intake valves.

It's on the "other forum", so I'm not sure if I'm allowed to post the link. But I have it if someone wants it in PMs.

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2004 Impala LS - got some mods sold!!!
2009 Subaru Impreza WRX STI

NAIOA moderator Still Imp'n, just in a different Imp.

I am sure you can post it. Atleast I would hope so, it is helping other out.

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Red 2dr 99 GTP "Old setup" Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

"New Setup" Back to stock

ClubGP Message Forum troubleshooting

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2004 Impala LS - got some mods sold!!!
2009 Subaru Impreza WRX STI

NAIOA moderator Still Imp'n, just in a different Imp.