ET cylinder heads
Thread Starter
Staging Lane
Joined: Apr 2004
Posts: 90
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From: NY
ET cylinder heads I have just installed a set of ETs 215s. My car makes good power UP TO 6500 Then it falls off. Its not my camshaft my tuner tells me it in the heads valve springs. I have called ET they tell me its my lifters. has anyone else had trouble with ETs heads. Not trying to bash anyone just want my car to make power up to 6900 rpm.
Thanks Wheeelzzz
Thanks Wheeelzzz
If you reused your stock lifters and they have some miles on them, then it could be them sticking at high RPM. Otherwise, it could be the springs or too short of a pushrod or too heavy of a rocker. Did you resue the stock rockers?
I don't see any problem with the above dyno graph that makes me think that the springs aren't up to par.
To the thread starter, if you reused your stock rockers, then they are most likly fine. Are the springs that came on the heads been shimmed at all? I'd think that they shoudl be to withing XX amount of coilbind. What is the camshaft like? Is it very aggressive? More info needed to help determine the problem.... but from what you are saying, if the car's got enough fuel system to support the setup, then I'd have to agree with the tuner, it probably is in the valvesprings/valvetrain.
Again, if the stock rocker arms were reused and are good, and if the stock lifters were reused and they were o.k., then I"m gonna have to say the springs need to be shimmed/looked at.
To the thread starter, if you reused your stock rockers, then they are most likly fine. Are the springs that came on the heads been shimmed at all? I'd think that they shoudl be to withing XX amount of coilbind. What is the camshaft like? Is it very aggressive? More info needed to help determine the problem.... but from what you are saying, if the car's got enough fuel system to support the setup, then I'd have to agree with the tuner, it probably is in the valvesprings/valvetrain.
Again, if the stock rocker arms were reused and are good, and if the stock lifters were reused and they were o.k., then I"m gonna have to say the springs need to be shimmed/looked at.
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From: Austin, TX
Kinda looks like a dip vs. a real drop...but that could be a weird dyno spike at the very end, who knows. Who is your tuner? What are your cam/engine specs?
Also, you're complaining about 480rwhp?
Also, you're complaining about 480rwhp?
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To be honest with you it looks like it is the lifter problem in this case because the curve comes back up. From the graph it drops off around 6200 then comes back up at around 6600 - 6700. If it is valve float the horsepower and torque will drop off and not come back just keep dropping off.
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Yup my ET heads keep on pulling to 7K (Which is where my tuner let off the gas)
I do have the upgraded FTI springs (PS4's) good upto .650" lift
THESE ARE THE NICEST LSX CYLINDER HEADS I HAVE EVER SEEN!
And my tuner Jeremy Formato believes these are the nicest heads that money can buy!
I do have the upgraded FTI springs (PS4's) good upto .650" lift
THESE ARE THE NICEST LSX CYLINDER HEADS I HAVE EVER SEEN!
And my tuner Jeremy Formato believes these are the nicest heads that money can buy!
Thread Starter
Staging Lane
Joined: Apr 2004
Posts: 90
Likes: 0
From: NY
Well i went down to my tuner to ask him about lifters & he gave me a dyno sheet from a different zo6 with ET 215s and as you can see it has the same dip. How can lifters be bad in two different engines. I just want to get to the bottom of this. He also thinks its valve springs. 
I have found this what do you guys think. Will this spring work.
I just resolved this problem. I did a lot of research and even considered a stronger dual spring. I realized that staying with a dual spring was not fixing the problem but just covering it up. I set out on a quest to reduce mass on the valve side without buying expensive titanium valves. I installed Comp's new 26120 beehive spring with titanium retainers. I re-dynoed the car and the power holds to the rev limiter! You will have to purchase new valve seats with the 26120 but it is worth it. Comp seriously underrates this spring when they advertise it but it will work.
I have found this what do you guys think. Will this spring work.
I just resolved this problem. I did a lot of research and even considered a stronger dual spring. I realized that staying with a dual spring was not fixing the problem but just covering it up. I set out on a quest to reduce mass on the valve side without buying expensive titanium valves. I installed Comp's new 26120 beehive spring with titanium retainers. I re-dynoed the car and the power holds to the rev limiter! You will have to purchase new valve seats with the 26120 but it is worth it. Comp seriously underrates this spring when they advertise it but it will work.
Last edited by wheeelzzz; Jul 19, 2006 at 12:25 PM.
Let me start this off a different way, because may be wrong with my first initial statement.
What is done to the engine with the camshaft specs? Can you pm me your Serial # on the side of the head so I can figure out what chamber size and valve spring are on there. Can you also if possible post the air\fuel ratio graph and total timing that is used?
Thank you,
Craig
What is done to the engine with the camshaft specs? Can you pm me your Serial # on the side of the head so I can figure out what chamber size and valve spring are on there. Can you also if possible post the air\fuel ratio graph and total timing that is used?
Thank you,
Craig
Questions for ETperformance while we're at it, what are the standard springs that are rated to 650... and how do they compare to say the patriot golds? I'm surious as to wether they will be enough for what I have in store for them. Please take this to PM if you need more details as to what heads I have, setup, etc. Thanks.
