383 piston explode - Team Camaro Tech
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post #1 of 42 (permalink) Old Jan 16th, 08, 07:43 PM Thread Starter
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Michael
 
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383 piston explode

My piston exploded on my 383 in my garage when i was revving it to 6 grand. My cams float is around 7500. There is no piston just rings it scraped up my wall a little and it sent chunks of piston in all 8 cylinders. It also bent three valves that i just did a quick check on. There was also a mark on another piston from a valve but no detonation.

The baby only had 300 miles. The heads were also shaved .020 and the deck clearance was 0. Do you know what could cause this?
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post #2 of 42 (permalink) Old Jan 16th, 08, 07:44 PM
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Re: 383 piston explode

Tell us EVERYTHING you know about the engine.

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post #3 of 42 (permalink) Old Jan 16th, 08, 07:52 PM
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Re: 383 piston explode

What cylinder?....Cast or forged slugs?.....Piston to wall clearance?.....Lean Fuel Mixture?.....Detonation?.....Are you running NOS?
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post #4 of 42 (permalink) Old Jan 16th, 08, 08:02 PM
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Re: 383 piston explode

Not enough valve to piston clearance.JMO with info given.

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post #5 of 42 (permalink) Old Jan 16th, 08, 08:05 PM
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Re: 383 piston explode

free revving to 6k in the garage? why?





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post #6 of 42 (permalink) Old Jan 16th, 08, 08:12 PM
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Re: 383 piston explode

Quote:
Originally Posted by JimM View Post
free revving to 6k in the garage? why?
Thats what i'm thinking.........
How did it send chunks of pistons in all 8 cylinders when the head seals off the other cylinders, the only way it could have sent them into the other cylinders from the bottom, which I do not think would do much damage.
can you post pics.

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post #7 of 42 (permalink) Old Jan 16th, 08, 08:13 PM
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Re: 383 piston explode

Free reving a motor like that will tear the end right off a conecting rod , thats why poeple loose engines in the burnout box when they don't run rev limiters .
Mark.

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post #8 of 42 (permalink) Old Jan 16th, 08, 09:19 PM
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Re: 383 piston explode

Quote:
Originally Posted by ace's68 View Post
Thats what i'm thinking.........
How did it send chunks of pistons in all 8 cylinders when the head seals off the other cylinders, the only way it could have sent them into the other cylinders from the bottom, which I do not think would do much damage.
can you post pics.
The peices of the broken piston will go up through the intake to the other cylinders.
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post #9 of 42 (permalink) Old Jan 16th, 08, 10:30 PM
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Re: 383 piston explode

Quote:
Do you know what could cause this?
Here is your awnser.........

Quote:
My piston exploded on my 383 in my garage when i was revving it to 6 grand.
Please tell me this is a joke. Why would you rev it that high? I am assuming it was in nutral since it's in your garage.

All I can say is wow.

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post #10 of 42 (permalink) Old Jan 16th, 08, 10:32 PM
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Re: 383 piston explode

Quote:
Originally Posted by JimM View Post
free revving to 6k in the garage? why?
My thoughts exactly. Free revving a motor like that is just asking for trouble. 7500rpm under load is allot easier on it that 6k unloaded.

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post #11 of 42 (permalink) Old Jan 17th, 08, 04:43 AM
 
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Re: 383 piston explode

Bet they were hyper pistons too!

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post #12 of 42 (permalink) Old Jan 17th, 08, 05:33 AM
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Re: 383 piston explode

Yesterday I ran really fast into the wall. Then my nose hurt really bad and blood started coming out. Not sure why?

Just messing with ya.
Just seems like a bad idea to wind up a motor like that..
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post #13 of 42 (permalink) Old Jan 17th, 08, 08:12 AM
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Re: 383 piston explode

This was the reason I asked long ago, why someone would rev a 302 on the dyno to 7k , unloaded.
0 deck?, wonder what quench was. And floated valves to 7500 in the garage too?

Would it really detonate in the garage?

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post #14 of 42 (permalink) Old Jan 17th, 08, 09:28 AM
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Re: 383 piston explode

free reving an unloaded motor like that is REALLY bad... mine has never gone above 3500 or so without a load on it.





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post #15 of 42 (permalink) Old Jan 17th, 08, 09:46 AM
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Re: 383 piston explode

I bet it make a god-awful sound.

If it happened to me, I’d need to replace the motor and the driver’s seat upholstery.
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