Name this engine noise, can't be good!

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the putting or the whirring? Id think the putting is an exhaust leak.
 
If noise goes away in gear, flex plate related.
 
Flex plate bolts hitting on trans dust cover? Hold your hand against the dust cover and feel for the vibrations. If thats it maybe just a bolt backing out or the thrust bearing is beat and crank moving about.
 
Use a mechanics stethoscope, to pinpoint where the noise is coming from.

Piece of wood dowl or long screwdriver will work too.
 
The really offensive noise doesn't start until the motor gets really good and warm. Not saying it's a good engine by any means anyway, but the really nasty noise starts after I've driven for a little while.
 
to me; it sounds like from inside the oilpan, but not rods; and the one time I have heard that was when a rod was slapping the dipstick and bouncing it off the pan. It went away when I pulled the dipstick out with the engine running.

On a Chevy I have heard a worn out timing chain hit the tin cover but that was a bit different.

IDK; Time to drop the pan I guess
 
That last video may at the flexplate or the TC bolts. But it sounds even more like an exhaust leak. Quite a different sound that the 1st video. With that hole in the inspectoin plate it ought to be easy to rotate the crank a bit at at time and check the TC bolts and the flex plate. Loose flexplate to crank bolts requires separating the trans and engine.

Any chance this has a exhaust heat riser flap still in it that has come partway loose? If the thremo spring is still there, and it turns the flap when it heats up... that might be it.

This 'hot noise' ought to be better traceable; better doing that and pulling the pan to chase this hot noise does not make sense 'til you do more to localize it. If 'twer me, I'd get a wooden dowel to place against various spots and against my ear to try to localize this.

I hope you have some jackstands under there too, and not just the jack.
 
Exhaust leak, the pitch and intensity changes with the engine temp. 2nd audio is definitely different than the 1st
 
Yeah, I know there's an exhaust leak. Manifold pretty sure.

So I got under there and one of the flex plate bolts was hand tight. I did the best I could with a open end wrench and the vast majority of the chatter has gone away. Guess it would be nice to get those fully torqued, but good enough right now.
 
Have you verified the thrust main isn't out? Had it happen more than once.

Also, had a friend wreck his B body car years ago. He wanted to put a new converter in it. I said and I quote "make double damn sure you use RED LOCTITE on those cheesy assed converter bolts...they WILL come loose and bite you in the can if you don't".

Converter is in and all is well. Looking at the plugs, I can see the engine wants more ignition. So, I order a box for him.

Two days after the box goes on, a knock develops. He thinks it's the box. So we bolt the old ignition back on. Still knocking.

Then he decides a bolt got dropped into the carb. How he figured that I've never discovered. This is 1991 and he still, to this day has never explained that bone headed thinking.

Now, both heads are off. I swing by his house after work and he has the pan off and half of the Pistons and rods out. I'm thinking WTF is going on? So I climb under the car and start looking. Nothing is wrong.

So I say to him turn the crank a couple of times so I can have a look. Turing the crank by hand I can hear the clunk. It's coming from the converter. The little bolts are loose. Like socks on a rooster. WTF???

To this day, he swears up and down he used red LOCTITE. We all know he didn't, because when I told him to use it and asked if he had any, he said no but I'll get some. I offered to loan him mine but no, he wanted his own. When he didn't ***** about the cost of a little tune of red LOCTITE I should have known he didn't use it.

So how did the car get destroyed? Easy. It was all apart and sitting in his garage. Where the washer and dryer were. They were on an inside wall, so the exhaust for the dryer went up the wall, across the ceiling and to a vent on the outside of the garage.

His wife told him the exhaust hose had fallen off the dryer, but he blew it off. A few months later he went out and went to out it back together. It was one giant pile of rust. Every machine surface was rusty, and I mean junk rusty. The master cylinder and everything else cast iron was covered in rust.

At that point, he sold the car for next to nothing. What a waste.
 
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