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Overrevving engine

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Old Oct 29, 2011 | 11:03 PM
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Default Overrevving engine

Funny question... What would happen to your engine if you accidentally shifted into second gear instead of fourth at about 100 mph? I have a 2000 corvette and I made that mistake. The engine is making a bad clicking sound now. It gets worse the higher RPMs you go.
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Old Oct 29, 2011 | 11:06 PM
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8500 RPM assuming a coupe with stock tires.
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Old Oct 29, 2011 | 11:07 PM
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Default Ouch

You probably broke a valve spring or bent a pushrod. Hopefully it is something in the top end.
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Old Oct 29, 2011 | 11:09 PM
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How much would it cost to repair a valve spring or pushrod? Thanks for the help!
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Old Oct 29, 2011 | 11:10 PM
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Originally Posted by alankb
You probably broke a valve spring or bent a pushrod. Hopefully it is something in the top end.
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Old Oct 29, 2011 | 11:16 PM
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Originally Posted by Nick_D
How much would it cost to repair a valve spring or pushrod? Thanks for the help!
Someone needs to remove the valve covers, then remove the rocker arms and pushrods for inspection before it's ran anymore.

It would probably cost about $800~$900 to replace all the pushrods and valve springs, including parts and labor.

PS - when shifting from 3rd to 4th, DO NOT pull the shifter to the left!
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Old Oct 29, 2011 | 11:20 PM
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Originally Posted by ZeeOSix
Someone needs to remove the valve covers, then remove the rocker arms and pushrods for inspection before it's ran anymore.

It would probably cost about $800~$900 to replace all the pushrods and valve springs, including parts and labor.

PS - when shifting from 3rd to 4th, DO NOT pull the shifter to the left!
Haha oh yeah I learned my lesson! Thank you so much for your help!!!!! I have some work to do now.
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Old Oct 29, 2011 | 11:23 PM
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http://www.shortshifter.com/techniques2.htm
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Old Oct 30, 2011 | 12:11 AM
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As others have said, Pull the valve covers and take a look, Don't drive the car anymore. If you are lucky all you did is broke a spring/Push rod.
Good luck with the repairs, Keep us posted on what you find.
Mr.Bill
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Old Oct 30, 2011 | 12:23 AM
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I wish the OP good luck with the repairs. I thought however that the rev limiter was supposed to protect against stuff like this. I guess it can't help in all cases.
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Old Oct 30, 2011 | 12:27 AM
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Originally Posted by Z06ster
I wish the OP good luck with the repairs. I thought however that the rev limiter was supposed to protect against stuff like this. I guess it can't help in all cases.
The limiter will work on a throttle rev, But not on a mechanical rev.
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Old Oct 30, 2011 | 12:29 AM
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Glad no BOOM LOL
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Old Oct 30, 2011 | 01:49 AM
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Default Rev limiter

Originally Posted by Mr.Bill
The limiter will work on a throttle rev, But not on a mechanical rev.
It can't help in this situation. It would have to disengage the trans or something. Not possible.
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Old Oct 30, 2011 | 08:52 AM
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Default Over the top. . .

Originally Posted by Mr.Bill
As others have said, Pull the valve covers and take a look, Don't drive the car anymore. If you are lucky all you did is broke a spring/Push rod.
Good luck with the repairs, Keep us posted on what you find.
Mr.Bill
100% but I'll add one thing, label the push-rods so they go back in the lifters in the right order. Block is pretty tough, I would doubt if the lower end is damaged, but like others have said, Do Not Use It Till it Can Be looked Over By a GM Master technician !

And you'll want to drain the oil and replace the drain plug with a magnetic one. Hope all turns out well for you.
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Old Oct 30, 2011 | 09:46 AM
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You will be very lucky if it's not bent valves
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Old Oct 30, 2011 | 10:00 AM
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I did that at about 80 soon after I got the car new in 2000. No problems, but a little embarrassed. No weird noises either, so I bet you bent a push rod or broke a spring. Good time to upgrade to hardened push rods and springs. I did this years later on when I had a spring break on me. Not that expensive.
Good Luck!
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Old Oct 30, 2011 | 12:21 PM
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if you bent a pushrod, the valve had to hit something! They don't just bend
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Old Oct 30, 2011 | 01:44 PM
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Originally Posted by Trios
They have some of their wording backwards in some of the examples.
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Old Oct 30, 2011 | 02:33 PM
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Originally Posted by printmanjackson
if you bent a pushrod, the valve had to hit something! They don't just bend
Good Point.

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Old Oct 30, 2011 | 03:06 PM
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My car is actually at the dealer right now. I was definitely not going to drive it with that sound in the background. So far they still don't know the issue but one of the guys thinks its bad lifters. Tomorrow I should know exactly whats wrong with it. Thank you all for the help, I've been pricing pushrods, springs, and lifters.
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