Help. Chewed up valve tips. pictures
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Joined: Oct 2009
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My best guess is the valves were not properly hardened. The very tips of the valve stems are hardened to stop wear. Is it possible someone ground the tips to height match the valves in the heads? Its polly too late but you could have the valve tips tested for hardness.
If ONLY the intake valves are damaged then it has to be a hardening problem with them.
If ONLY the intake valves are damaged then it has to be a hardening problem with them.
TECH Regular
Joined: Jul 2011
Posts: 452
Likes: 2
TECH Regular
Joined: Jul 2011
Posts: 452
Likes: 2
According to the chart I posted, those have a pre-load of 2.09 mm, which is 0.082". Their total travel is 4.22 mm which is 0.166". Running them at 0.110" isn't yet bottoming them out, but is on the deep side of a pre-load IMO.
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Joined: Jul 2011
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I think it has more to do with the big 0.648" lift and the double springs, which are probably pretty stiff. You could be right that you need roller tipped rocker arms at this point.
From the picture it looks like the intake valves are messed up but the exhaust looks ok. Is it that way through out the engine?
Any idea what your wipe pattern looks like.
I think that .648 is a typo on the exhaust lift. There is no way that's right.
What does the rocker arm look like?
Any idea what your wipe pattern looks like.
I think that .648 is a typo on the exhaust lift. There is no way that's right.
What does the rocker arm look like?
Contact Shane@Thunder Racing. Screen name is XtraCajunSS
The check the wipe patter you take off the rocker, wipe the valve tip off, color it in with a permemant marker, put the rocker back on and roller the engine over. The contact point will wipe off the marker.
Talk to Shane about it. The man helped me out a bunch.
The check the wipe patter you take off the rocker, wipe the valve tip off, color it in with a permemant marker, put the rocker back on and roller the engine over. The contact point will wipe off the marker.
Talk to Shane about it. The man helped me out a bunch.
when you put the cam in did you degree it and check PTV? you have 241 heads that are milled and a 231/234 @112lsa,,, depending on your degreeing of the cam you probable have 10-12* of overlap, if pistons have not been fly cut you could be not within PTV clearance/tolerances ... could the intake valves have just kissed the tippy tippy top of the pistons?
Launching!
Joined: Aug 2006
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From: Lewisville, TX
i would think that at that lift the stock rockers would not have the correct geometry. i saw no mention of replacing the rocker arms after you oil starved the top end. were they replaced? if not, why would you not if you saw fit to replace the valves?
That's what I was going to ask. Did you replace the valves because the tips were chewed up like they are now?
If so what did the rockers look like? What I'm getting at is if the the valves looked that bad before the rockers probably looked similar. If you put chewed up rocker arms back on the top of new valves this could be the reason the valves are chewed up now.
If so what did the rockers look like? What I'm getting at is if the the valves looked that bad before the rockers probably looked similar. If you put chewed up rocker arms back on the top of new valves this could be the reason the valves are chewed up now.