Has anyone ever seen such a pitted surface on top of a forged piston, you can see it better on piston # 4?? Strange is all pistons look alike, always on the intake side of the piston. I think it could be detonation marks.


I had all season long a very high oil consumption due to LE porting my AFR heads. Could it be that the unburned oil made such marks?? After engine shut down I always had oil puddles on closed intake valves.
I’m using 93 octane gas, CR is 11.3:1, DR is 9.0

 

there is no pitting..

 

What is it then?? Not normal looking, the rest of the piston surface is nice and sleek. Motor has only 500--600 miles..

 

I dont see anything but the the normal top of the piston.. And what does Porting have to do with oil consumption??????

 

Piston looks normal. Maybe a better pic? Oil problem is probably valve stem seals.

 

Heads are back on, so no better pictures. Above the # 4555 you see imperfections of the surface, like small pinholes. When you go over it with your fingernail you can certainly feel it. On cyl. #4 you can see it even better, the picture taken is from cyl. #2. Look at the left piston...

Here is a link if you want to know where VERY high oil consumption can come from:
http://forums.corvetteforum.com/c4-t...100-miles.html

 

I see no pic...

 

I only see scratches

 

WOW!!!! THATS RIFUCKINGDICULOUS!!!!!! too bad you couldnt just strangle Loyd and be done with it!!!!

 

So how is it LE's fault for for this?
Maybe if you raise you CR a few more points, the extra pressure will blast the oil past the rings and back down into the pan. Dont forget that the pits will actually lower CR. Watch out for detonation and windage.


And you always pull your intake to inspect the intake valves?
Wow.

 

I highly doubt this is Lloyd's fault. He's the ****.

 

How is it not his fault that he broke through the ports? It's pretty obvious he doesn't vacuum check his heads after porting since mine were broken through in quite a few places too.

 

OP are you referring to the small marks towards the arc on the smaller valve relief?

 

Okay fellows I'll explain it again. The picture in my first post shows piston # 2 and partially # 4. Like I said before, it's on the intake side and above the embossed # 4555. The piston # 4 shows it a lot better than looking at piston # 2. There are thousands of small pinholes which are seen on all pistons, but only in this area.

Here is the same picture red underlined is the area of the pinholes.

 

are those pistons forged?

 

That is where the piston face meets the head deck.

 

Try reading the first post again....

 

"AFR heads were done first by AI 286/216 then from Lloyd Elliot 314/236."
You don't think that would be a problem, having two differnt companies port the heads...I don't know why he would have them ported, twice since flow #'s don't mean jack..it's even on his sig heavily ported 210cc LT4 AFR heads..that's a lot of material being removed. I don't see how this is anyone's fault but his own.

 

reading owns me once again.. lol.. Hmm

 

OP, did you use thread sealant on the rocker studs?