titanium valves problems

I have a bae block with 5 fat heats bae high ratio rockers,about 2 years ago I changed the exhuast valves with new square cut keepers and went to manley lash locks .About 10 runs later I keept loosing lash so I pulled the springs and the locks were moving up the stems,the springs were installed at 2.100 with 475psi on the seat and were not in coil bind.So I bought a new set of victory titanium exhuast valves and went to bead locks with the manley lash locks ,now I have 8 passes on them and there doing the same thing with one valve and I haven't pulled the rest of the spring to look at the others yet .
It seems that every pass I loose about .002 clearence that when I start to worry ,the car is a altered with a 540ci and a lencodrive and we only spin the motor 8500 rpms .So why am I having this problem ,I've checked the clearence between the cap and the stem with the keepers on and I seems to be about .001 to .002 thousands

 

When it "moves up the stem" is the groove on the stem getting beat out, or is the ring on the keeper moving - essentially shearing off?

 

Are they the all in one style or separate lash cap with a ridge to hold it ? The all in one style will beat the groove in the valve and cause this problem. As soon as the valve leaves the seat there is no pressure on the keeper groove, When the valve closes all the spring pressure hits the groove and it acts like a jack hammer on the groove.

 

To answer both questions the keepers and lash caps are 3 pieces not 2 and the keepers are fine its beating up the grove in the valve

 

You can’t interchange them. Manley stuff doesn’t work on victory stuff. And victory locks will work on Manley valves, same goes for the retainers. Pac retainers with Manley locks bite into the titanium at the bottom of the retainer. I ran into that and junked a set of valves. Sent it to victory for examination and that what I was told. Manley locks are that nice. The retainer will show heavy wear too I bet if you look close enough.
Went to victory locks cap with Pac springs and Manley valves no issues anymore

 

Talked to Victory yesterday and they told me that I wish I would have known that before 3 sets of valves, did talk to Manley about it and they said the motor had been over reved.

 

so Manley's essentially admitting that their locks won't hold up at the RPMs we typically run a Hemi at? Nice to know after I just put a set of them on my heads....

 

How do you come up with your installed height target number ? What is the lift numbers on the intake and exhaust ? after the rocker ratio ?

 

What retainers are you using?

Had same issue using retainers that had Stoppard the bottom. The keepers were hitting the stop in the retainers and not clamping valve correctly

 

they are manley

 

Looking at the bottom ao the retainer you can see where the keeper are hitting ,going to change to victory keepers and retainers and one more set of valves.
thanks for the answers
Hydrotherapy

 

This is a good article on setting springs
http://www.engineprofessional.com/articles/EPQ215_18-38.pdf

 

I run Manley on my car, shifting at or above 11,000 RPM. I have never had an issue with the valves, locks, retainers, or lash caps. Their stuff has been fantastic and I will continue to use it. May be worth looking at installed height setup. Put a dial indicator and test spring on the motor, see what you're truly netting on each and every valve, then setup accordingly. It is a tedious and time consuming process but it is worth it in the long run. I strip my heads apart every weekend and re-measure, any variation leads to further in depth analysis to see if seat moved, valve stretched, etc. etc.. etc...

Brandon Booher

 

True

 

That's a lot of work. That's Dedication.