I removed the cylinderhead, and I have seen that 2 valves are bent on the top. The valves didnt hit the pistons. Anyone ever had these problems?

Here is my setup:

ported d16y8 head
AEM TRUTIME camgear
105300 cam
ferrea 20º Super Flo. 1 mm oversize valves
zex valve springs
ported d16y8 IM
hondata gasket
b16a2 tb
d16a6 block
76mm p29 pistons
walbro 255lph
testpipe
fidanza 7lbs flywheel
dc2 catback
comptech header
tuned p28 ecu

max rpm is 7500

 

am I the only one with this problem

 

Are they mushroomed? It sounds like the valve was not properly heat treated. That location expiriences very high stress and it needs to be much harder than the rest of the stem. Some companies actually spin weld a harder material on for the top.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b18bEKcoupe &raquo;</TD></TR><TR><TD CLASS="quote">Are they mushroomed? It sounds like the valve was not properly heat treated. That location expiriences very high stress and it needs to be much harder than the rest of the stem. Some companies actually spin weld a harder material on for the top. </TD></TR></TABLE>

I have the problems with 3 valves, and dont think the heat threating is the problem

 

Do you have pictures?

 

I have two vids

this valve is ok: http://eurostylez.org/bilda/eg4/valves/Heile.avi

and this is damaged: http://eurostylez.org/bilda/eg4/valves/Kaput.avi

 

If the lash was too large than this could happen. But that would have been a noisy head.