frazierboy98

Yeah sounds like rings.How many miles not that it really matters that much cause something can break at any amount of miles but anyway?!

99RTA

iTrader: (-1)

take a light and carefully look around the edge of the piston. you maybe able to see some damage. With all that oil in the cylinder the rings are either busted or the piston is. Other things could be involved too but now that you went this far i would pull the pan and pop the piston out.

evangto87

iTrader: (6)

what throws me off with this is the lack of noise you say the motor didnt have. Typically when u have a busted ring landing like the picture on the previous page shows, you can hear it. Try turning the motor by hand to bring the piston all the way to the bottom then all the way back up. Then once again rotate the motor so the piston is at the bottom. See if any oil finds its way passed the piston rings.

99RTA

iTrader: (-1)

Mine didn't have any noise and number 7 cylinder was using oil badly. Well the only noise i heard was the piece of piston going out the exhaust.

LS1-450

iTrader: (33)

You state above that the cylinder in question made 70 psi, where the others made 190 psi. That's enough information to be considered a pressure/leakdown test. Potato, Patato, it was enough of a leak down/pressure test to call it one.

You have a very obvious ringland problem w/ that cylinder.

jhall

iTrader: (3)

I pulled the drain plug and only a few tiny shavings which has been common at every oil change. nothing out of the ordinary.

jhall

iTrader: (3)

134k on the motor.

99RTA

iTrader: (-1)

From what i see in the pictures i'n starting to think its possible you have pasted rings and the pcv system is adding enough oil to make the cylinder look this bad. Pasted rings can fool you into thinking something is wrong.

99RTA

iTrader: (-1)

rings can paste in high mileage cars...don't be suprised if you pull it and nothing else is wrong. number 7 cylinder coolects alot of oil from the PCV system and adds to the posibility.

jhall

iTrader: (3)

Excuse my ignorance but what are pasted rings? All my friends here also told be that i should hear an issue if the ringland was bad but we did not hear a tick or anything. Thanks for all the replys fellas.

samson_420

iTrader: (1)

Pasted rings? < WTF dat mean?

My motor sounded perfect with that piston. . . .

99RTA

iTrader: (-1)

Carbon build up can cause the rings to stick or paste to the piston. They stop moving and then loose contact with the cylinder. Happens in high mileage engines depending on what oil you use etc. Not saying that it but it sure looks like it.

99RTA

iTrader: (-1)

on the net its hard to say for sure BUTT i super sized your piston picture and i think i can see some kind of damage around the very top of the piston. I think yer cooked.

frazierboy98

Pull out your piston you have damage.

frazierboy98

Wow remind me not to ever buy speedpro pistons^^^^^^^^^^

69LT1Bird

iTrader: (1)

Detonation did that damage its not the fault of the Speed Pro pistons, it was the owner or tuner who took that one out.

evangto87

iTrader: (6)

Looking at this picture, it looks like you had problems before the detonation. The cylinder walls looks terrible.

jhall

iTrader: (3)

I will give this a try again,i turned the motor over a few times and did not notice any oil.I put an ounce or so of oil in the cylinder before i pulled the head to see if compression would rise and it didnt,i guess it is possible the ring is damaged to the point where the oil would not help sealing the ring.

evangto87

iTrader: (6)

This is one of those situations where you hope for the best and prepare for the worst. Worst case scenario you put a set of nice forged rods and pistons in it.

ae13291

iTrader: (8)

if you think compression test is the same as a leak down test then you are an idiot!