S2000 Under The Hood S2000 Technical and Mechanical discussions.

Dropped valves

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Old 09-11-2017, 06:13 AM
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OUCH!

Autopsy photos look like engine was not running lean --- trying to look for any silver lining. Good luck with the new engine & repairs.



Old 09-11-2017, 08:09 AM
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Jeezus.

Can you provide more details on the over-rev that caused this?
are you sure it wasn't a 5 to 2?
Old 09-11-2017, 11:40 AM
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Originally Posted by jyeung528
Jeezus.

Can you provide more details on the over-rev that caused this?
are you sure it wasn't a 5 to 2?
Honestly I was doing a speed run and so I was at about 9k Rpms when I shifted from 3rd to 2nd..
Old 09-11-2017, 04:31 PM
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Originally Posted by Teran94
Honestly I was doing a speed run and so I was at about 9k Rpms when I shifted from 3rd to 2nd..
Did you stay in it? Anytime I have ever done this in any car I have always got back out of it before the clutch fully engaged and have gotten lucky
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Old 09-12-2017, 03:45 AM
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Originally Posted by bgoetz
Did you actually drop a valve (i.e the retainer let go) or did you just float that valve into the piston? Typically retainers just don't let go instantaneously
Piston to exhaust valve contact at 10700 or better, 100%.

Likely all intake retainers are fractured. In a case this bad, very tiny cracks may be found on the exhaust retainers.
Old 09-12-2017, 04:18 AM
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Originally Posted by Teran94
My luck has been pretty bad with all my cars in the past year.
Have you had any luck with bicycles and or skateboards?
Old 09-12-2017, 05:30 AM
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Originally Posted by bgoetz
Did you stay in it? Anytime I have ever done this in any car I have always got back out of it before the clutch fully engaged and have gotten lucky
I'm usually pretty good about taking my foot off the gas and onto the clutch if i make a mistake but I couldn't tell you how fast I did it at the time
Old 09-12-2017, 05:39 AM
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Originally Posted by freq
Have you had any luck with bicycles and or skateboards?
Old 09-12-2017, 05:57 AM
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I didn't notice this before, but it looks like the valve was completely split in half... lengthwise. I don't think I've ever seen this before.




Old 09-12-2017, 11:57 AM
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Originally Posted by windhund116
I didn't notice this before, but it looks like the valve was completely split in half... lengthwise. I don't think I've ever seen this before.




I think what you are seeing is the other exhaust valve has broken off its stem and has become embedded in the port of the adjacent valve.


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