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Forced Induction Superchargers | Turbochargers | Intercoolers

Killed it

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Old Jul 30, 2012 | 09:10 PM
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Default Killed it
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
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Old Jul 31, 2012 | 12:31 AM
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probably gunna see this



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Old Jul 31, 2012 | 12:57 AM
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Do you have an intercooler under that eaton?
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Old Jul 31, 2012 | 08:14 AM
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Originally Posted by denmah
probably gunna see this

how was the cyl?
Originally Posted by trav-tech
Do you have an intercooler under that eaton?
no, it does have a fuel rail under it with meth nozzles though. An intercooler would not fit using the stock hood.
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Old Jul 31, 2012 | 10:57 AM
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in it for carnage pics! hey denmah? was that a 5.3 piston out of the notch stang with the 88?
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Old Jul 31, 2012 | 02:08 PM
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Throw a 5.3 in there and let it rip again.
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Old Jul 31, 2012 | 02:09 PM
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Originally Posted by I8UR4RD
in it for carnage pics! hey denmah? was that a 5.3 piston out of the notch stang with the 88?
That's a 4.8 piston
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Old Jul 31, 2012 | 08:47 PM
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What plug were you running, fuel, timing etc.?
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Old Aug 1, 2012 | 03:45 AM
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pump gas?
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Old Aug 1, 2012 | 01:02 PM
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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?
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Old Aug 1, 2012 | 04:09 PM
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Next one you build run a non-projected tip plug in it at least.

Also verify the timing.
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Old Aug 1, 2012 | 07:58 PM
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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.
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Old Aug 2, 2012 | 04:50 PM
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Cyl is perfect. Its a good day.
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Old Aug 2, 2012 | 05:29 PM
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Wow you got lucky.
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Old Aug 19, 2012 | 11:42 PM
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Originally Posted by 357i


Cyl is perfect. Its a good day.
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.
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Old Aug 20, 2012 | 01:04 AM
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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.
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Old Aug 20, 2012 | 09:38 AM
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That looks familiar. Sucks, but thanks to a tight ring gap, lots of power, which equals heat, and the ring lands pop like that.
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