Originally Posted by 4piston

I don't sell Supertech stuff but in their defense some of these issues guys are talking about are caused by other stuff going on. Instead of looking straight at the valve, try to figure out what could cause the damage to the valve.



The mushrooming or dimpling on the valve tip "could" be from the hardening process on the tips but most likely is it from the spring not controlling the valve or too much lash. Most stainless valves are all made in argentina and they have similar finishing processes. There are cheaper valves that go thru less processes and have case hardened tips and better valves that have a deeper progressive hardened tips. No matter how good the quality of the valve if you have a spring that is not controlling it and its bouncing around everywhere every time it closes.. its going to tear **** up. If you check your lash frequently you will notice this issue starting a lot sooner and you can replace the valves and springs before its an issue.

If a spring is really out of control you can fatigue a brand new set in a couple dyno pulls. Most of these $6 springs people are using need replaced every couple races. Good springs can last years. It just depends on the application. Guys pushing **** real hard need to pull springs and check them every couple races at least. In other forms of racing springs get checked at least every event and often mid-event. I know some guys here are pushing big power and big rpm and have never thought to check a spring. It will save you $$ in the long run and you'll make more power.


Just my $.02 opinion

Originally Posted by 4piston

I don't sell Supertech stuff but in their defense some of these issues guys are talking about are caused by other stuff going on. Instead of looking straight at the valve, try to figure out what could cause the damage to the valve.



The mushrooming or dimpling on the valve tip "could" be from the hardening process on the tips but most likely is it from the spring not controlling the valve or too much lash. Most stainless valves are all made in argentina and they have similar finishing processes. There are cheaper valves that go thru less processes and have case hardened tips and better valves that have a deeper progressive hardened tips. No matter how good the quality of the valve if you have a spring that is not controlling it and its bouncing around everywhere every time it closes.. its going to tear **** up. If you check your lash frequently you will notice this issue starting a lot sooner and you can replace the valves and springs before its an issue.

If a spring is really out of control you can fatigue a brand new set in a couple dyno pulls. Most of these $6 springs people are using need replaced every couple races. Good springs can last years. It just depends on the application. Guys pushing **** real hard need to pull springs and check them every couple races at least. In other forms of racing springs get checked at least every event and often mid-event. I know some guys here are pushing big power and big rpm and have never thought to check a spring. It will save you $$ in the long run and you'll make more power.


Just my $.02 opinion

Originally Posted by NAH2B

i have run ferrea, skunk2 and stock valves and i have NEVER broken one.

lots of people i know run supertech valves and lots of them have broken.

who knows maybe everyone running and breaking supertech valves have other problems causing the failures AND maybe everyone running ferrea have their **** 100% correct not to be breaking them....

imo stay way from supertech, just my 02.

Originally Posted by PRO1

ferrea

Originally Posted by tagperformance

looks like the the lower retainer got hot from friction and seized the valve in the guide and hanging the valve down in the bore and the piston finishing it off.

Originally Posted by tepid1

What's up with the fatigue marks on the stem?

Originally Posted by rookiepains

what does the top of retainer look like ?

check the rocker for retainer contact marks.

Originally Posted by 4piston

Are you sure it didn't hit something before it broke?

Originally Posted by 90blackcrx

What were the reasons ?

Originally Posted by 4piston

I don't sell Supertech stuff but in their defense some of these issues guys are talking about are caused by other stuff going on. Instead of looking straight at the valve, try to figure out what could cause the damage to the valve.



The mushrooming or dimpling on the valve tip "could" be from the hardening process on the tips but most likely is it from the spring not controlling the valve or too much lash. Most stainless valves are all made in argentina and they have similar finishing processes. There are cheaper valves that go thru less processes and have case hardened tips and better valves that have a deeper progressive hardened tips. No matter how good the quality of the valve if you have a spring that is not controlling it and its bouncing around everywhere every time it closes.. its going to tear **** up. If you check your lash frequently you will notice this issue starting a lot sooner and you can replace the valves and springs before its an issue.

If a spring is really out of control you can fatigue a brand new set in a couple dyno pulls. Most of these $6 springs people are using need replaced every couple races. Good springs can last years. It just depends on the application. Guys pushing **** real hard need to pull springs and check them every couple races at least. In other forms of racing springs get checked at least every event and often mid-event. I know some guys here are pushing big power and big rpm and have never thought to check a spring. It will save you $$ in the long run and you'll make more power.


Just my $.02 opinion

Originally Posted by 061000rr

x2 ^^ i ruined a set of crowler retainers cause i didnt no you had to grind the rockers down. if they hit hard enough over time it would be the weak spot right were it broke.