357i

iTrader: (4)

Well, killed #7. Engine developed major crank case pressure, even at idle. Did a leak down, 90% on 7. All he plugs looked perfect, even 7, no metal or funny color. I will assume it has a broken ring land as the rear steam vents are blocked, although seems odd to have no signs of damage on the plug. Have to pull the motor to get the head off sadly. I plan to pull it out tomorrow, until then I'm hoping for the best.

99 LS1
Stock rebuilt bottom end with 15k
Eaton m112 blower
Alkycotrol injection

denmah

iTrader: (2)

probably gunna see this

trav-tech

iTrader: (1)

Do you have an intercooler under that eaton?

357i

iTrader: (4)

no, it does have a fuel rail under it with meth nozzles though. An intercooler would not fit using the stock hood.

I8UR4RD

iTrader: (16)

in it for carnage pics! hey denmah? was that a 5.3 piston out of the notch stang with the 88?

a4ls2goat

Throw a 5.3 in there and let it rip again.

a4ls2goat

That's a 4.8 piston

Fbodyjunkie06

iTrader: (10)

What plug were you running, fuel, timing etc.?

skinnies

iTrader: (33)

pump gas?

357i

iTrader: (4)

Tr6 plugs @ .028
AFR's at 11.2-11.4
not sure on timing as I had it dyno tuned and never looked at it.

93 pump gas

Pulled the motor last night




Pulled the head at lunch today, cyl and piston look perfect. will pull the oil pan tomorrow and pull the piston out. Maybe a broke ring?

Fbodyjunkie06

iTrader: (10)

Next one you build run a non-projected tip plug in it at least.

Also verify the timing.

Monzsta

Probably crushed the ring land. Open the gap on the top rings to. 028" or there abouts when you go back together. It'll help it live. And get the rear steam ports working again.

357i

iTrader: (4)

Cyl is perfect. Its a good day.

2000RATA

Wow you got lucky.

dmelvin

iTrader: (8)

I'm glad to see this. Both because it always sucks to have something break. And secondly because I was throwing around the idea of putting an Eaton blower from a Ford on my 5.3 and found you manifold thread today when I was researching it.

gnx7

iTrader: (28)

This is from #7 on an LS2 GTO engine with a rear mount turbo.
https://ls1tech.com/forums/forced-in...-piston-6.html

Looks like the rings butted/expanded and crunched the piston groove cracking it. Only had 46K miles on the shortblock. About 10K boosted. Bore was also fine luckily and simply honed all of them, ordered 1 new piston, and a set of Total Seal rings.

The Alchemist

iTrader: (19)

That looks familiar. Sucks, but thanks to a tight ring gap, lots of power, which equals heat, and the ring lands pop like that.