C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

OK Guys, need some serious help!!

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Old Apr 14, 2008 | 01:53 AM
  #301  
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Before you pull the pan or the heads or anything else, get a boroscope, that may not be the correct spelling, and look inside the cylinders. Its like those things plumbers use to check inside your pipes. You can stick it into the spark plug holes and see if anything is in there.
Now that you have oil to the rockers, I think we can rule that out as the problem. I'd lean towards the something fell in the engine theory at this point. If you can see it with the boroscope you might get real lucky and be able to fish it out witout a major teardown.


Paul
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Old Apr 14, 2008 | 01:56 AM
  #302  
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Sounds like you have oil getting to the top, Id just fire it up and look closer for the noise. As much as you dont care for crawling under the Vette grab a flashlight and take a peek at the flexplate first.
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Old Apr 14, 2008 | 03:13 AM
  #303  
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Another quick question...when you installed the squirters did you happen to switch the fuel supply/return lines?
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Old Apr 14, 2008 | 06:44 AM
  #304  
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Originally Posted by ZD1
Another quick question...when you installed the squirters did you happen to switch the fuel supply/return lines?
How would he have done that? Two different sizes.

-- Joe
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Old Apr 14, 2008 | 07:21 AM
  #305  
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Originally Posted by ZD1
Another quick question...when you installed the squirters did you happen to switch the fuel supply/return lines?
Originally Posted by anesthes
How would he have done that? Two different sizes.

-- Joe
They are the same size on mine. They only fit one way the way the hoses are bent. I'll double check, but it seems almost impossible to switch them based on simply the way they fit.
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Old Apr 14, 2008 | 07:37 AM
  #306  
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Originally Posted by jsup
They are the same size on mine. They only fit one way the way the hoses are bent. I'll double check, but it seems almost impossible to switch them based on simply the way they fit.
What? no. The fuel rail has two different size saginaw fittings. You have a super ram, with stock type TPI fuel rails + hard lines, correct?

-- Joe
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Old Apr 14, 2008 | 07:49 AM
  #307  
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Originally Posted by anesthes
What? no. The fuel rail has two different size saginaw fittings. You have a super ram, with stock type TPI fuel rails + hard lines, correct?

-- Joe
Nope, on mine they are the same size. I went to the dealer and got the two different sized O RINGS and when I got home, they were the same and I had to go back and get another large one.

Both nuts are 16MM.

I have the stock TPI fuel rails, and they are the same size.

I have the stock hard lines to the base of the block, where it goes to flex line, to the filter and return on the frame rail.
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Old Apr 14, 2008 | 09:08 AM
  #308  
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My '88 is the same size on both. I hooked mine up the wrong way when I made braided lines. Not a big deal, it just wouldn't start.:o
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Old Apr 14, 2008 | 09:11 AM
  #309  
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Originally Posted by jsup
Nope, on mine they are the same size. I went to the dealer and got the two different sized O RINGS and when I got home, they were the same and I had to go back and get another large one.

Both nuts are 16MM.

I have the stock TPI fuel rails, and they are the same size.

I have the stock hard lines to the base of the block, where it goes to flex line, to the filter and return on the frame rail.
That is retarded! Every application I've ever seen for TPI or TBI had two different sizes. Why the heck would they do it differently on some later years..

-- Joe
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Old Apr 14, 2008 | 09:17 AM
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I'm putting up another video right now.....stay tuned.

You can hear the knocking when I turn the key as the starter turns the motor.
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Old Apr 14, 2008 | 09:41 AM
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Originally Posted by jsup
I'm putting up another video right now.....stay tuned.

You can hear the knocking when I turn the key as the starter turns the motor.
I doubt it's internal then. An internal knock usually only happens when the piston is under load of combustion. Which wouldn't happen when being rotated by the starter.

I still think something is tapping something. flexplate, tcc weight, something..

-- Joe
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Old Apr 14, 2008 | 09:44 AM
  #312  
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Originally Posted by anesthes
I doubt it's internal then. An internal knock usually only happens when the piston is under load of combustion. Which wouldn't happen when being rotated by the starter.

I still think something is tapping something. flexplate, tcc weight, something..

-- Joe
I sure hope so. You can hear it pretty clearly in the video.

It's more of a knock than a knock.
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Old Apr 14, 2008 | 11:29 AM
  #313  
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Originally Posted by jsup
It's more of a knock than a knock.
???


Originally Posted by jsup
If it is hydrolock, a compression test will tell me if something is up, right? Assuming the rings took a hit.
Do you know what (a) hydrolock is? Hydrolock is slang for hydrostatic lock. Think about it. You don't have, and never did have a "hydrolock".

RACE ON!!!
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Old Apr 14, 2008 | 12:07 PM
  #314  
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Sorry CFI, I meant more than a knock than a tap.

Anyway, here's the new link of the new noise

I think I'm fked.

http://www.youtube.com/watch?v=JBqvSyS0vlE
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Old Apr 14, 2008 | 12:21 PM
  #315  
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I'm gonna have to agree with Joe. In this video you can see the noise occurs every revolution of the motor, not every other, which pretty much rules out a valvetrain issue. It realy sounds like a rotational component is hitting something (damper, crankshaft, flexplate, etc). I doubt it's something in a cylinder. It's too regular for that, and the starter doesn't pause when it hits that spot. I think it's something hitting sheet-metal somewhere.
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Old Apr 14, 2008 | 12:26 PM
  #316  
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Originally Posted by JLeatherman
I'm gonna have to agree with Joe. In this video you can see the noise occurs every revolution of the motor, not every other, which pretty much rules out a valvetrain issue. It realy sounds like a rotational component is hitting something (damper, crankshaft, flexplate, etc). I doubt it's something in a cylinder. It's too regular for that, and the starter doesn't pause when it hits that spot. I think it's something hitting sheet-metal somewhere.
I just spoke to my mechanic. He stopped by and listened to it. I'm going to ship it there and have him pull the oil pan and flywheel cover to see if he can isolate it. I do some of my best work on my back, but not in this case.

He's going to send over the other guy who works with him to listen, then we'll decide if he wants to pull the pan and look around.

At this point, summer's comin' and I want this thing running!!
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Old Apr 14, 2008 | 12:33 PM
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Originally Posted by JLeatherman
I'm gonna have to agree with Joe. In this video you can see the noise occurs every revolution of the motor, not every other, which pretty much rules out a valvetrain issue. It realy sounds like a rotational component is hitting something (damper, crankshaft, flexplate, etc). I doubt it's something in a cylinder. It's too regular for that, and the starter doesn't pause when it hits that spot. I think it's something hitting sheet-metal somewhere.
Thats what I think it is. The good news is, eventually it will break off. The bad news is, it will probably come through the BH/pan/fender. Could also be the trans. I know Petek about 200 posts ago recommended he unbolt the TC and slide it back. That was never done.

-- Joe
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Old Apr 14, 2008 | 12:38 PM
  #318  
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Sounds like a valve hitting a piston to me. If you've centralized it to #7 I'd take a machinist scale and see if the valves are closing all the way.
Just a thought.
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Old Apr 14, 2008 | 12:51 PM
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Originally Posted by anesthes
Thats what I think it is. The good news is, eventually it will break off. The bad news is, it will probably come through the BH/pan/fender. Could also be the trans. I know Petek about 200 posts ago recommended he unbolt the TC and slide it back. That was never done.

-- Joe
Guys, I am not ignoring these suggestions, I just dont have all that time to spend.

That's why I'm sending it to my mechanic to put on a lift and pull the pan. If I had to do this we'd be talking about this about three weeks from now.

I do appreciate the input, please keep in mind my ability to spend hours under the car in a day is extremely limited.
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Old Apr 14, 2008 | 12:51 PM
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this will make it easier for everyone to view

Last edited by FICINJECTORS; Apr 14, 2008 at 12:54 PM.
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