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post #1 of 18 (permalink) Old 02-23-2016, 01:05 PM Thread Starter
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disturbing piston pictures

Some scary pictures
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File Type: jpg piston2.jpg (51.4 KB, 338 views)
File Type: jpg Piston1.jpg (40.2 KB, 310 views)



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post #2 of 18 (permalink) Old 02-23-2016, 01:21 PM
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Ouch! What size valves/cam did that?

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post #3 of 18 (permalink) Old 02-23-2016, 01:33 PM
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Was anything odd going on before that? Sorry to hear about your trouble.


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post #4 of 18 (permalink) Old 02-23-2016, 02:11 PM
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Whoa – happened after a rebuild or what? Btw what make & type engine is it?
@ BigNorm - was thinking the same thing about the cams...


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post #5 of 18 (permalink) Old 02-23-2016, 04:20 PM
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Wow! what do the heads look like?
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post #6 of 18 (permalink) Old 02-23-2016, 06:02 PM
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Quote:
Originally Posted by unbalanced View Post
Some scary pictures
I'm thinking one of two things. You were changing out a cam and put in adjustable pushrods and didn't get the cams on the base circle with piston at top dead center when adjusting or cams put in not lining up the timing marks. I'm I close? By the way, that sucks big time. New valves, valve guides, and seals on the valves that hit.

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post #7 of 18 (permalink) Old 02-23-2016, 06:51 PM
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Back in the 88 to 95" conversion days this used to be a fairly common picture. There were some pistons out there, even some SE pistons, that had valve reliefs that weren't quite right. Different cams, bigger valves, milled heads and thin head gaskets quite often stacked up to valves touching pistons here and there.
Not a HUGE deal as long as you caught it quick enough before it finally broke the head off the valve. A lot of bikes ran for a long time that way.
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post #8 of 18 (permalink) Old 02-23-2016, 07:29 PM
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Originally Posted by tdkkart View Post
Back in the 88 to 95" conversion days this used to be a fairly common picture. There were some pistons out there, even some SE pistons, that had valve reliefs that weren't quite right. Different cams, bigger valves, milled heads and thin head gaskets quite often stacked up to valves touching pistons here and there.
Not a HUGE deal as long as you caught it quick enough before it finally broke the head off the valve. A lot of bikes ran for a long time that way.
I can't imagine how loud the clanging had to be.

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post #9 of 18 (permalink) Old 02-23-2016, 07:30 PM
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Someone bring that in to you for a build or a repair?

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post #10 of 18 (permalink) Old 02-23-2016, 07:48 PM
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I can't imagine how loud the clanging had to be.
Actually, a little divit like that barely makes an extra click over the regular valvetrain and exhaust noise, and once it's hammered the divit it doesn't make noise any more. The only real reason it shows up is if it bends the valve, which it may not, and somebody took it in because "somethin' ain't right".
Valves are surprisingly flexible and don't always break.

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