Simonsaysr1
Proven Member
- 135
- 11
- Jan 30, 2016
-
Rocky mount,
North_Carolina
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Lots of them look just like that, likely detonation damage from just the stock tune on the hot corners of the chambers.
Mine was only 1&4. Wouldn’t all 4 chambers be the same if it was detonation?
Not really, those cylinders are likely the lean ones or the hot spots on the cooling system.Mine was only 1&4. Wouldn’t all 4 chambers be the same if it was detonation?
I think it’s sh**ty casting and or sh**ty aluminum. Had the same in only 1 & 4. Used 320 grit on dremel but didn’t remove too much since it was my first time messing with the headYou must be logged in to view this image or video.You must be logged in to view this image or video.You must be logged in to view this image or video.You must be logged in to view this image or video.
Looks completely fine. Nor did I ever have knock really occur. I never noticed any audible detonation eitherLooks like marks caused from detonation. What does the Piston look like in that cylinder?
Jakks piston definitely show signs of detonation.
You can remove the carbon in those pockets with a brass wire wheel on a dremel if you have one.
i dont think so , the gouge is pretty deep and would taper to a bigger gap the lower it got resurfaced. , im hopping that when I put the gasket on it.. it is inside the sealing ring and I can continue. if not its more money and time i guess. I feel pretty confident when I try it tommorrow its going to just barely (i mean just barely) make it or be over cut. I sure hope its not toast.Yikes. Yeah patience is key when it comes to things like this, as you already know. I just used a dremel on medium speed for the oil passage. Maybe it’s salvageable if you’re getting it decked???
This is an 80k never torn down 7 bolt. I pulled the head last year to change the HG and found the same thing as the OP. This is before it was really pushed. Id have a hard time believing this was the result of detonation after looking at those outer pistons but who knows.You must be logged in to view this image or video.
Not 100% sure how it got this way but I didnt want to leave it like this.You must be logged in to view this image or video.
I decided to fix what I found and ended up doing the valve job while it was off. Very easy to smooth out, the usual 80/ 180/ 320 by hand then some high speed rotary stuff followed by polishing. Go easy and stay away from the valve seats.You must be logged in to view this image or video.
And heres is where I ended up with it.
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I noticed some weird pits in the cylinder head combustion chamber? Wouldn't this create a hot spot? What would cause this?