95stro

I purchased this motor for the heads but decided to find out what the problem was. It appears that number 8 cylinder hydro-locked or detonated and bent the rod, then the piston struck the crank and then scored the cylinder wall in one spot, does this seem correct and if so why would this happen on a stock motor with 83,000 km?







What would you guys do with this? Scrap it? Sell it? Or what?

IROC Z28

iTrader: (1)

It has to be worth something. i can't tell from the pictures if the gouge is too deep in the wall for a bore/rebuild. If it is too deep, i cannot image there is much value to it other than trying to sell the rest of the internals for something. If its rebuildable someone will buy it. At what price i do not know. Is the crank damaged?

As for why it happened.... I have a thread here with 300+ views and no good answer as to why my totally stock L76 had a piston disintegrate and knock a hole in my block. Only 48k miles on it. Detonation can be caused by a number of things and unless you knew the vehicle history you probably wont find out.

95stro

I would say that it could be bored pretty easily as it is not overly deep, but I don't want to spend that kind of money on a motor I don't need. The crank counterweight area by number 8 piston is a little gouged up but it seems to be true and rotates easily. The rod bearing looked to be in pretty good shape considering what happened to it. The machine shop suggested boring the one cylinder only for a cheap alternative, which I am not too fond on. The motor was carboned up quite bad (bad fuel or fuel additive?) but cleaned up fairly easily.
There was also some sludge in 3 cylinders aswell as a textured white coating on the exhaust valves as seen below (antifreeze? or?)

Steve - Race Eng

iTrader: (1)

The aluminum 5.3 can be bored to 3.900", in other words to 5.7 liters. If the sleeve in that hole is just scored and not cracked you are good to go.
Steve

95stro

I just wish I could find a reasonably priced machine shop to bore it out. The last one I called wanted $1700 to bore it!

IROC Z28

iTrader: (1)

I wouldn't be afraid of boring 1 cylinder. Only 80000 km on it. That's my take at least.

Steve - Race Eng

iTrader: (1)

I see you are in the middle of nowhere so you are limited with local shops. You should consider sending the block out via UPS to get bored and honed. I'm sure one of the sponsors would love to sell you a set of pistons and do the work for you.
Typical price should be in the range of five to six hundred to bore and torque plate hone the block to fit a new set of pistons.

Steve

95stro

Would that mess with proper air:fuel ratios in that cylinder enough to worry about?

95stro

I found some local-ish machine shops who are reasonably priced. The one was $350 +100 if I want to go to a 3.898" bore. And another was $30 a cylinder + $5 a cylinder to take it to 3.898". I think I will get it bored out and do a mild build with it for my truck.