2.0L LSJ Performance Tech 205hp Supercharged SS tuner version. 200 lb-ft of torque.

Why dont ecotecs perform better with cams

Old 01-21-2015, 12:57 PM
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anybody experimented with stiffer springs, or shimming the spring inside the lash adjuster, to try get it to keep up with the replacement valve spring pressure and / or cam change ?

what about changing the hole size in that control disc ?

combination of both ?
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Old 01-21-2015, 01:04 PM
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I disassembled every version, including the extended ones zzp sells with their regrind cams. They're all the same internally. I thought about opening the oil inlet hole, but that doesn't make it any stronger. The piston gets simply beat up with aggressive cams and springs. I could give it a shot though.
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Old 01-21-2015, 05:37 PM
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when you start doing those things you risk over pumping the lash adjuster and holding the valves off seat why reinvent the wheel when there is a solution
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Old 01-21-2015, 06:32 PM
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Originally Posted by armcclure View Post
I disassembled every version, including the extended ones zzp sells with their regrind cams. They're all the same internally. I thought about opening the oil inlet hole, but that doesn't make it any stronger. The piston gets simply beat up with aggressive cams and springs. I could give it a shot though.

Ah, so our adjuster design simply fails with excessive pressure, loosing the trapped oil inside. (Is that than instant total failure? as I can imagine that they will shed some oil over time, so they slowly collapse a bit after f.i. a cam install)

And to make them any stronger, the internal piston surface should be increased. (more force for a certain oil pressure.)


ps; you don't need a vice to bleed these. Simply insert a paperclip wire to press the internal valve and you can bleed with your fingers...

Last edited by Speedytec; 01-21-2015 at 06:51 PM.
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Old 01-21-2015, 08:42 PM
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Originally Posted by Speedytec View Post
Ah, so our adjuster design simply fails with excessive pressure, loosing the trapped oil inside. (Is that than instant total failure? as I can imagine that they will shed some oil over time, so they slowly collapse a bit after f.i. a cam install)

And to make them any stronger, the internal piston surface should be increased. (more force for a certain oil pressure.)


ps; you don't need a vice to bleed these. Simply insert a paperclip wire to press the internal valve and you can bleed with your fingers...
lol i tried that paperclip method and nothing happened except the paperclip bent, is there a trick to it?
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Old 01-21-2015, 10:51 PM
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So solid lash adjusters is basically the solution?
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Old 01-22-2015, 07:37 AM
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Originally Posted by Spawne32 View Post
lol i tried that paperclip method and nothing happened except the paperclip bent, is there a trick to it?
It's tricky. You gotta have it perfectly straight to work right. Usually easier to use a real small allen wrench
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Old 01-22-2015, 10:37 AM
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Originally Posted by riceburner View Post
So solid lash adjusters is basically the solution?
yup
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Old 01-23-2015, 07:41 AM
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I know how to bleed then with a pick lol. I was indicating how easily they bleed down when in use.

I looked at a couple different lifters last night. Enlarging the oil feed holes is not an option.
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Old 01-23-2015, 08:23 AM
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Originally Posted by Slowbalt2000 View Post
Pretty much the cam lobe is compressing the hydraulic lifter instead of the valvespring because the lifter is easier to compress, therefore losing lift and power.
Okay this definately makes sense now.

Originally Posted by JapEatr View Post
Sticky!!!

Yes and im very excited to get my solids installed

You may want to descibe the necessity of the machining to install the solids
do you mean to machine into the head where they sit some to make them work?

with solid lifters, then it should be safe to run stiffer valvesprings correct?

i'd be quite interested in running some solids, not only to protect my motor but obviously to make some real power to make the cams and springs more worth it.
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Old 01-23-2015, 08:36 AM
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Originally Posted by riceburner View Post

do you mean to machine into the head where they sit some to make them work?

with solid lifters, then it should be safe to run stiffer valvesprings correct?

i'd be quite interested in running some solids, not only to protect my motor but obviously to make some real power to make the cams and springs more worth it.
you dont machine the head you have to machine each solid lash adjuster to each cam lobe to get the clearance needed and you alos have to have a cam ground for solid lash adjusters
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Old 01-23-2015, 08:53 AM
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Originally Posted by mrbelvedere View Post
you dont machine the head you have to machine each solid lash adjuster to each cam lobe to get the clearance needed and you alos have to have a cam ground for solid lash adjusters
So who has the know how to do this, I have an extra head in my garage.
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Old 01-23-2015, 09:00 AM
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yeah mr b well one day i may be sending my stuff to you. so you're saying zzp stg2 cams will need to be modified now?
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Old 01-23-2015, 09:30 AM
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Originally Posted by BoostedLemonPie View Post
So who has the know how to do this, I have an extra head in my garage.
i can but its not cheap

Originally Posted by riceburner View Post
yeah mr b well one day i may be sending my stuff to you. so you're saying zzp stg2 cams will need to be modified now?
you should be able to get your cams reground but your best bet is to get a set of blanks and get them ground for solids
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Old 01-23-2015, 09:38 AM
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dammit where does one get blanks? haha.

i would definately need your help deciding on specs.
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Old 01-23-2015, 09:39 AM
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Comp cams is like 10 miles from my house, pass it all the time.
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Old 01-23-2015, 09:52 AM
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comp wont do solid cams for the ecotec and im working on getting cams ground for solids
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Old 01-23-2015, 09:54 AM
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so this like totally changes the profile of the cams huh? damn.
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Old 01-23-2015, 10:00 AM
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yup
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Old 01-23-2015, 10:07 AM
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Originally Posted by mrbelvedere View Post
comp wont do solid cams for the ecotec and im working on getting cams ground for solids
I gotcha, I've never been Inside Their facility, although I did drop off an application *fingers crossed

Familiar with rhs (racing head service)? They are local to me too.

Sounds like me getting my Balt this late after production is a good thing, since it took you guys all these years to pioneer the way of the lsj.
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Old 01-23-2015, 10:16 AM
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Took me couple reads but I got it....great information in here. Appreciate the knowledge guys. So with proper lash adjusters and following work, what kinds of gains can one expect from a cam upgrade or for comparison sake lets say a custom cam ground with same specs as like a zzp cam
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Old 01-23-2015, 10:39 AM
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Originally Posted by alerosaint View Post
Took me couple reads but I got it....great information in here. Appreciate the knowledge guys. So with proper lash adjusters and following work, what kinds of gains can one expect from a cam upgrade or for comparison sake lets say a custom cam ground with same specs as like a zzp cam
I dont believe anybody is on solids yet, although japeatrs thread I was reading said he would be running them on the exhaust side. But idk if that's happening yet.
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Old 01-23-2015, 10:40 AM
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a solid cam is going to have a different lobe compared to a hydraulic cam its like comparing oranges and meatloaf to one another
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Old 01-23-2015, 10:50 AM
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oh ok. But can you get the same duration and lift as a zzp stage whatever cam but would yield XX more hp? So your best guess ~50-70whp gain =)?? I guess what im wondering, theoretically can this process yield huge gains for ecotecs on cams?

Last edited by alerosaint; 01-23-2015 at 12:12 PM. Reason: dyslexia
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Old 01-23-2015, 11:31 AM
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Any guess would be exactly that; a guess. It should be a substantial difference though.
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