Possible valve bind

[t-bird88]

Correct me if I am wrong but does this constitute valve spring bind:

I am having some valve spring problems with my head, and that is keeping me from turning up my boost level (from 15# to 20#). Any time that I rev it above 4K, the damn thing develops a flutter that drives me absolutely insane. When the flutter starts, the boost goes to 5# and my fuel pressure goes up 6#, there is no power when this happens. This has been plaguing me for some time now, and I have gotten no relief no matter how many times I crack it open.

Any help would be great.

Jim B .

[Dave Severson]

Might want to check the pressure on the valve springs, could be losing tension on a few of them.... How many miles on the engine and or the valve springs? High RPM and high mileage will take it's toll.....

Or, if you've recently changed valve springs and or camshaft, or the springs going into coil bind?

[shawnlee28]

My money is on springs....boost needs more spring than N/A,also I would think going from 15 to 20 would almost be enuff the require a spring change.
I doubt its coil bind ,as 4 k would bend or break something.

[techinspector1]

They're just tired, time to retire 'em to the shelf and use 'em to break in a flat tappet cam later.

[thesals]

yup, i would replace them, call up whatever company you plan on buying springs from and get a reccomendation by your motor, cam specs, the boost you plan on pushing and max RPM... that should be what they'll need to get you the right spring pressure

[t-bird88]

The springs are not all that old, I had them put in last summer, that is what is really getting my goat. I swapped out the HLA's hoping that was the problem, but no luck there.

One thing that I was going to try, after we get moved to our new house, is yank the springs off of my other turbo head and try them. When I had my old 'D' port head on there, this 'flutter' did not happen, but when I changed over to my oval port head, the flutter started. I later got tired of chasing this and put the 'D' port back on it. Problem went away. But an arrant bolt took that head out, along with a piston and 3 cracks in the cylinder wall, and I had to go back to the oval port head. And to no surprise, the 'flutter' came back.

Thanks for the advice. I just needed to get an idea as to what ball park I was in and where I needed to go next.

Jim B .

[pat mccarthy]

well if the springs are to light they can not keep up on the cam your valve train weight and cam profile and rpm + boost all play a roll in this the springs can never keep up and then bad thing s happen you need to check out that you step up is right on valve height. that has followers if this is not right this just adds to it,

[t-bird88]

After doing an extensive amount of digging and reading, and even more reading on this subject, I have come to the conclusion that the springs are the problem and need to be changed out. Just have to wait until we get the new house and are moved before I can drop the scratch on the new springs.

Will post back once those are changed out and let you guys know how it is running.

Jim B .

[thesals]

alright... hope the move in goes well..... i know they can be stressful times