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Under the car....

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Old Sep 16, 2007 | 09:33 PM
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Default Under the car....

So, I have my car up on blocks getting ready to be violated. I have cinder blocks, 2 each, under each tire, and I jacked the car up so the tires sit on the cinder blocks. I figure no issues with where to place the jack stands, and they aren't falling off the blocks.

Anyway, I noticed the brwon **** that is under the car, under the seats and floor pans.

It does not seem to be anywhere else. I tried to scub it off, to some success.. I tried engine cleaner, brake cleaner, simple green, and liquid degreaser. It does come off if you really really work it.

Then I started thinking......I said to myself "self, before you fk something up stop and ask the question." So here it goes...

Is the brown crap under the car, road dirt (car has 30K miles) or is it sound/heat proof stuff since it's only under the seats and floor pan. It doesn't seem to appear anywhere else under the car.

Thanks...
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Old Sep 16, 2007 | 10:46 PM
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Originally Posted by jsup
Then I started thinking......I said to myself "self, before you fk something up stop and ask the question." So here it goes...
"Why am I lying under my car that is supported with cinder blocks??????"

Get some jack stands before you go back under there! Or this could be you! >>>
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Old Sep 16, 2007 | 10:51 PM
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Originally Posted by behnevette
"Why am I lying under my car that is supported with cinder blocks??????"

Get some jack stands before you go back under there! Or this could be you! >>>
Let me explain....

The cinderblocks are on their side. One high, two wide. They are not standing up, they are laying down.

The tires sit on the cinderblcks as they would sit on the floor.

Each tire has two cinder blocks underneath them.

I'll throw jackstands underneath as a procaution, but how can anythin happen. They're only 8 inches high, and two wide...
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Old Sep 16, 2007 | 10:53 PM
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Hey, it's your life. Best of luck to you.
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Old Sep 16, 2007 | 10:58 PM
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I'll put some wood under the wheels.
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Old Sep 16, 2007 | 11:22 PM
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what you see is probably some under coating, in certain light it looks brownish - some cars got more than others.
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Old Sep 16, 2007 | 11:50 PM
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If the car's from somewhere that puts white ****(salt) on the black ****(roads) then the brown ****(underseal) is probably there to stop red ****(rust) forming. Just a ****(crap) guess tho'.
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Old Sep 17, 2007 | 12:36 AM
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Why undercoat a fibreglas car? DUH UH!!!

Its sound deadener for those that still can't hear

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Old Sep 17, 2007 | 03:29 AM
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Originally Posted by jsup
Let me explain....

The cinderblocks are on their side. One high, two wide. They are not standing up, they are laying down.

The tires sit on the cinderblcks as they would sit on the floor.

Each tire has two cinder blocks underneath them.

I'll throw jackstands underneath as a procaution, but how can anythin happen. They're only 8 inches high, and two wide...
Let me explain . . .

About 20 years ago I had a ford Pinto up on cinder blocks. I was luck to notice one of the cinderblocks starting to crumble and I just cleared the car when the block disintegrated. Use jack stands.
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Old Sep 17, 2007 | 05:03 AM
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[QUOTE=jsup;1561940509]So, I have my car up on blocks getting ready to be violated. I have cinder blocks, 2 each, under each tire, and I jacked the car up so the tires sit on the cinder blocks. I figure no issues with where to place the jack stands, and they aren't falling off the blocks.

WTF You Are Kidding RIGHT!!!!!!!
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Old Sep 17, 2007 | 08:09 AM
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Some undercoating is brown in color. If someone brought the Vette in to have it undercoated (northeast preventitive maintenance) they probably didn't know what the Vette is made of. They probably just sprayed everything and called it a day. Oh, there is some metal under there. I'll also offer advice on safety under the Vette, concrete blocks are much better than cinder blocks, but a good quality ramp is much safer. Jack stands worry me, especially if you're doing some heavy moving of parts like transmissions, etc. Having a Vette fall on you can leave a mark.
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Old Sep 17, 2007 | 08:44 AM
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Originally Posted by khhammer
Let me explain . . .

About 20 years ago I had a ford Pinto up on cinder blocks. I was luck to notice one of the cinderblocks starting to crumble and I just cleared the car when the block disintegrated. Use jack stands.
OK OK OK I get the hint. Going to HD today for a 2X12 or two and I'll put wood under the wheels. I'll also put jack stands.

I appreciate the input on the cinder blocks.

Glad I learned this the easy way..
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Old Sep 17, 2007 | 08:46 AM
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This stuff is just under the seats and floor pan on both sides. It's brown and textured.. Sound deadening, heat shield, or dirt?
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Old Sep 17, 2007 | 09:47 AM
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Sound deadening!!!!!! and it does turn that dirty looking color after time.
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Old Sep 17, 2007 | 10:22 AM
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Originally Posted by rick lambert
Sound deadening!!!!!! and it does turn that dirty looking color after time.
Cool, next question, can I spray over the top of it with bed liner just to freshen it up?
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Old Sep 17, 2007 | 10:46 AM
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John - LOOSE THE CINDER BLOCKS COMPLETELY.

Just get jackstands... that will allow you to remove the wheels and give you more wiggle room under the car.
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Old Sep 17, 2007 | 10:49 AM
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Originally Posted by bogus
John - LOOSE THE CINDER BLOCKS COMPLETELY.

Just get jackstands... that will allow you to remove the wheels and give you more wiggle room under the car.
OK, if I go jackstands, I have to extend them all the way up, which I'm not all that comfortable with.

I am going to get 2X12s and cut them down to 18 inches, screw 6 together and stack them up in place of the cinder blocks.

If I were to go jack stands, there doesn't seem to be a real good place to install them. Having the blocks under the tires seems to provide the most room under there.

Where under the car should I place the jack stands that I can be comfortable with them?

I have jack stands, and on a frame car it's easy, there's a lot of fiberglass under there to damage.
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Old Sep 17, 2007 | 11:10 AM
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The section under the seat is indeed steel and runs up behind the seat where it is bonded with fiberglass again in the trunk area. It is either sound deadening or rust coating, neither of which can be covered very well with new stuff especially if you don't know what the original material is made of. Sometimes even the same material won't even stick to itself after it's dried.


I'd scrap it off the best you can then put whatever you want on it.


Oh, and get some of those polyurethane pads and put them on the top of your jackstands then put the jackstands under the section in the front just to one side of the body lip. It's heavy steel and the pads will keep craters from forming on the frame.

Last edited by black_771; Sep 17, 2007 at 11:15 AM.
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Old Sep 17, 2007 | 11:14 AM
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Originally Posted by black_771
The section under the seat is indeed steel and runs up behind the seat where it is bonded with fiberglass again in the trunk area. It is either sound deadening or rust coating, neither of which can be covered very well with new stuff especially if you don't know what the original material is made of. Sometimes even the same material won't even stick to itself after it's dried.


I'd scrap it off the best you can then put whatever you want on it. .
Or just take the easy way out and live with it....

I'm not much for the easy way...
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Old Sep 17, 2007 | 11:27 AM
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Originally Posted by jsup
I'm not much for the easy way...
Famous last words of MANY C4 owners! (myself included)
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