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Old 01-03-2014, 03:47 AM
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Dropped a Valve at Track

Long story turned short, was at the track with some buddies just having some fun laying down some rubber and on my second pass smoke started coming out from my hood and I lose all power immediately and have to pull off to the side where a huge puddle of oil is leaking from two huge holes on my oil pan.

Needless to say I had to sit out the rest of the day just taking pictures and videos of the guys.





Pulled the oil pan plug and coolant comes gushing out. Uh oh. That ain't good.

Off came the valve covers and plugs.



The plug from cylinder four was giving me a hard time and when it finally does come loose this is what greets me. Oh damn.



Maybe I threw a rod, or dropped a valve. Whatever the case may be I was thinking of just retiring the block and turning it into a truck engine. Didn't want to waste a good 4 bolt 350 when it could be sleeved. Boy was I ever going to be surprised!

That ain't good!

Yesterday my friend and I decided to pull the right head off and this was the sight that was hiding in cylinder four.







Guess the machine shop is going to have a handful sleeving this block, huh? What do you guys think? .060 over? It'll buff right off!

On closer inspection, I theorized that the exhaust valve snapped off somewhere along the line and decided to play a game of Tag with the piston and cylinder head and got a little bit carried away.



Conclusion? Dropped an exhaust valve, snapped the rod when the forged piston wouldn't give way and it broke through the cylinder wall and ****ed everything up.

Goes to show that even with stainless steel valves, your engine being blue printed and properly taken care of **** will happen.

Just wanted to share this with you guys since there's a lesson to be learned here.

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Old 01-03-2014, 07:43 AM
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Old 01-03-2014, 08:53 AM
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Looks like you need the extra large can of piston glue!

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Old 01-03-2014, 10:08 AM
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Old 01-03-2014, 10:13 AM
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Quote:
Originally Posted by GoFastStripes View Post
Just wanted to share this with you guys since there's a lesson to be learned here.
It did make a mess of things, but what's the "lesson to be learned"?
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Old 01-03-2014, 10:16 AM
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Not sure a overbore will work. It looks like your cylinder walls are getting thin.
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Old 01-03-2014, 05:13 PM
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Engine damage

That is what is commonly known as Positive Crankcase Ventilation or a Windowed block. Sorry for your loss. .
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Old 01-03-2014, 05:39 PM
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Yikes, yes sorry for your loss.
Probably a lot of people on this and other sites have experienced something like this.
A broken wrist pin and a really strong forged rod can due wonders as well.
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Old 01-03-2014, 06:45 PM
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Yep, a friend of mine borrowed another buddy's BBC 69 Camaro to do some track time.. Long story short. Dropped a 2.30" intake valve going thru the lights.. Took out piston/wall and the H-beam rod with part of the pin, sawed the block almost in half.. Only thing salvaged was one cylinder head. a couple of roller lifters and some pushrods and rocker arms.

If you blow em up do it good!
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Old 01-04-2014, 07:52 AM
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Thanks for all the input guys. No lesson, just thought it had a good ring to it seeing the devastation a dropped valve can do to an engine running at just 4k RPM.

Rebuilding my new engine is now ongoing.
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Old 01-04-2014, 09:03 AM
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Quote:
Originally Posted by BOBCRMAN@aol.com View Post
Yep, a friend of mine borrowed another buddy's BBC 69 Camaro to do some track time.. Long story short. Dropped a 2.30" intake valve going thru the lights.. Took out piston/wall and the H-beam rod with part of the pin, sawed the block almost in half.. Only thing salvaged was one cylinder head. a couple of roller lifters and some pushrods and rocker arms.

If you blow em up do it good!
I'm sure upon returning the car the conversation went a little bit like this. " Did you know your engine is making a little funny noise?"

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Old 01-04-2014, 12:44 PM
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Forged piston? Sure?
Forged pistons tend to deform and capture parts that prevent the loose end of the rod from destroying the block.
Cast pistons tend to shatter like what's yours looks like.
Pics can be deceiving though.
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Old 01-05-2014, 01:51 AM
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guess I was lucky I was only doing 2k rpm when my valve dropped! I feell your pain brother!!!
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Old 01-05-2014, 01:57 AM
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i trashed a custom 3L v6 engine that i built on the dyno, valve dropped at just shy of 7k rpms and 25 psi of boost. it destroyed a custom j.e piston ,the block ,the 327 small journal rods i had machined to fit the engine, , and destroyed one of the one off cyl heads on the engine

it was a domestic v6 engine i had built to race in the import/sport compact series that was limited to 3L of displacement

im just glad it was a factory cast iron block and not my gm performance aluminum block
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