New engine tragedy, Broken valve stem |
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New engine tragedy, Broken valve stem |
Jetsetsurfshop |
Apr 2 2016, 06:36 PM
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#1
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Senior Member Group: Members Posts: 814 Joined: 7-April 11 From: Marco Island Florida Member No.: 12,907 Region Association: South East States |
On my first outing with the new engine tragedy struck. While giving it a little bit of RPM the engine made a noise I never heard before and then dropped a cylinder. Limped it home and this is what I found today.
That's the top of the valve you see still with the keeper! Damn. Anyone have any thoughts on what happened here? Everything we did was the same as the last build except we installed a more aggressive camshaft. (IMG:style_emoticons/default/headbang.gif) Attached thumbnail(s) |
fixer34 |
Apr 2 2016, 08:17 PM
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#2
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Senior Member Group: Members Posts: 1,085 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest |
If that is the valve spring retainer, then you didn't have the classic valve-piston interference. It appears the valve shaft failed, probably just a little down from the retainer. Maybe a fracture or defect and the double springs plus some extra rpms caused it to break. The good news is you most likely didn't damage the piston, cylinder, or head.
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