thats sucks atomic,get her fixed soon

 

I agree...most of the LS engines that I've seen are carbon monsters, even after just a short while of running...

 

Well thats comforting. I have plans for this engine...but it involves different pistons...

I am having a hell of a time trying to get the rod caps off, any suggestions?

 

Stick a hammer handle on the bottom of the piston and tap in the head of the hammer. That will pull the rod off the cap. That sucks, but looks like an oiling issue to me.

 

The way Ive always done it is loosen the rod bolts half an inch then use a brass punch on the bolts and it will pop the rod loose from the cap then you can back the bolt out the rest of the way and go on with it.

Looks like the main bore wasnt checked and burnt up the thrust bearing. Maybe Ill change my theory after Im not looking at them on my phone.

 

Got them out with a rubber mallet, not too bad. Bottoms of the pistons look brand new, and the rod bearings on the crank dont look bad.

Cylinder walls are good,





The dark spot on the center journal is oil.

 

Compared to what? Even with forced induction, they should look new with your mileage. The damage showing on the rod half of the bearings, mainly the one on the right, doesn't look good. Top half damage indicates detonation. In your case, I'm wondering about oil starvation, with the burnt bearings and damage concentrated on the center main. Weird. It's hard to tell, the pics make them look shiny, like cylinders with a zillion miles look. In real life, do they look freshly honed, like they should?

 

The crosshatching is still very evident on the cylinder walls. Im not sure where you are referring to on the crank rod bearings...

 

I am not an expert but I am 99% sure you were fat as hell and I bet you washed the bearing out with fuel. The pistons should not look anything like that!!!!!!!!!!! How did you tune this motor? Do you have a A/F ratios of what it was running through the rpm range?

Again I am not an expert but I am confident this was the main issue.

 

11.3 at 2+ lbs of boost, 12.8 from 0 to 2lbs, and 14.45 at stoich.