Strange Engine Noise

Last week, I was driving my 82 Mondial and it started to make a horrific noise in the engine compartment. I drove it home and thought "crud, not I have to fix it". My second thought was "cool, time to take this sucker apart!"

Here is the youtube video. Ignore the coolant leak. My son was helping me fill the coolant and we put too much in.

https://youtu.be/ff633Tgl5R0

What do you think it is?

Just so you know, there is a happy ending. I feel like the car is more mine now that I have taken it apart to tend to its wounds.

BTW, do you know what is just slightly better than saying "I finally own a Ferrari?"...."I fixed my Ferrari."

 

Thanks for all your feedback, you guys are great. I came to similar conclusions.

I took off the heat shield that covers the exhaust and it was quite loud there. At first, I thought it was this odd looking aluminum shield over the exhaust manifold. Never seen it look like that, mine is quite worn. When I dug a little deeper, it was a O2 sensor bung. Somehow, it had worked it way loose.

In my excitement to fix it, I burnt myself a few times before wising up and waiting for it to cool down. Afterward, tighten up, car back together and I am back on the road.

Also, while I was down there, I got a chance to inspect my coolant leak. It looks to be some bad clamps...well, hoping...
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Wow, the only difference is the increase in speed with acceleration. Bummer. Did you do the repairs yourself?

Your noise almost sounds like a cessna engine.

https://www.youtube.com/watch?v=MALJzp3qYog