Sharp thing in Cylinder 1?

[Negative Ghostrider]

I'm cleaning up the nead for new gaskets and I discovered this. Is it supposed to be there? Cylinder 1 on my W53 head. It's a sharp little barb. Almost looks like something punched through from the back side but that seems unlikely. 

[datzenmike]

Does the piston have a matching blemish? 

[Stoffregen Motorsports]

Demonic goat horns from the devil?

 

Try knocking it off and see if it's magnetic.

[Negative Ghostrider]

21 hours ago, datzenmike said:

Does the piston have a matching blemish? 

Yup. There's a little pit in the top. So it must have been a rogue chunk of something in the cylinder. 

 

[Negative Ghostrider]

19 hours ago, Stoffregen Motorsports said:

Demonic goat horns from the devil?

 

Try knocking it off and see if it's magnetic.

I pulled it out. Sharp little shard. Then I dropped it as I was getting a magnet. I swept around for it and didn't pull it up so either it wasn't or I just didn't find it. So that's going to remain a mystery for now. Just my luck. 

[datzenmike]

12 minutes ago, Negative Ghostrider said:

Yup. There's a little pit in the top. So it must have been a rogue chunk of something in the cylinder. 

 

 

Has to have found it's way through the carburetor. Lightly sand away any sharp edges, it will fill with carbon and be ok. 

[jagman]

It was probably the little piece on a spark plug.

[Negative Ghostrider]

Ok, cool. 

 

Supplemental question. I notice the outer edges of the cylinder ring on the head are nice and smooth on the plug side (bottom of image) but kind of jagged on the header side (by my finger). Is this anything to be concerned about?

 

I ran a straight edge along the surface and there is no warping or anything. There are some low spots around some of the coolant and stud holes as indicated by the dark spots which should be residual gasket. 

 

[jagman]

Use a small file or a dremel grinder to remove them. They can cause pre-detonation because they become hot spots in the cylinder.  

[Stoffregen Motorsports]

16 hours ago, jagman said:

Use a small file or a dremel grinder to remove them. They can cause pre-detonation because they become hot spots in the cylinder.  

Or some sand paper. This is actually very important for the reason Jagman mentioned.

 

[Negative Ghostrider]

Ok. Good to know about the edges. Thanks.

 

With the damage in the cylinder and piston, I can't quite grind them perfectly flat. I am guessing a smooth small indent is better than anything still sticking up, even if it's no longer sharp, yes? The damage left kind of volcano shaped pits on both surfaces. 

Edited August 8, 2020 by Negative Ghostrider

[Stoffregen Motorsports]

Just hit the spot with some emery cloth and call it done.

 

You could always peen the spot with a ball peen hammer to get it flat.

Edited August 10, 2020 by Stoffregen Motorsports