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Anyone blown a stock bottom end?

 
Old 01-20-2009, 04:28 PM
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396375
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St. Jude Donor '08-'09
Default Anyone blown a stock bottom end?

Did you diagnose the problem?What broke.Was it a rod,rod bolt ,piston etc...
Just wondering what is the weakest link in the bottom end.
Thanks.
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Old 01-20-2009, 04:36 PM
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Originally Posted by 396375 View Post
Did you diagnose the problem?What broke.Was it a rod,rod bolt ,piston etc...
Just wondering what is the weakest link in the bottom end.
Thanks.
Rod bolts and #7 piston seem to be the weakest. Most typical to break the ring land on #7
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Old 01-20-2009, 04:41 PM
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Drewstein
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Snapped a rod.
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Old 01-20-2009, 05:45 PM
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Originally Posted by 396375 View Post
Did you diagnose the problem?What broke.Was it a rod,rod bolt ,piston etc...
Just wondering what is the weakest link in the bottom end.
Thanks.
All depends on application. H/C high RPM change rod bolts/rods and if your going this far you may as well change the pistons. For FI up to 550-600 rwhp you need to run a really safe A/F ratio and timing as the piston ring lands can't take any rattling.
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Old 01-20-2009, 06:17 PM
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ring glands on #5 and #7 got me
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Old 01-20-2009, 07:56 PM
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01Tim
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ring land #5 got me 2 times 1stock 1forged
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Old 01-20-2009, 10:12 PM
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I bought one forged, but the prev owner cooked the factory block, not sure what happened.
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Old 01-21-2009, 12:13 AM
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Originally Posted by Toby Van Horn View Post
I bought one forged, but the prev owner cooked the factory block, not sure what happened.

It's called Hyperuetetic Alloy Pistons. The silica content makes them very brittle and the ring lands tend to snap like a cracker if you get any detonation....no room for errors with them at all.
About 7 years ago I found this out. It's really easy to tell when the pistons break...if the dipstick doesn't pop up and spray oil all over the place..you can do a compression test and the cylinders that come up 70-100 psi lower then the rest....are toast. I broke 4 piston ring lands.

For a bent rod I have only heard on at the track...it was knocking really loud.

Last edited by Shinobi'sZ; 01-21-2009 at 12:15 AM.
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Old 01-21-2009, 01:16 AM
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All started with #7. most likely piston failed first and managed to take everything else with it.
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Old 01-21-2009, 01:20 AM
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ringland 5 and 7. cracked pistons. didn't "blow", but it was time for a forged bottom end and a new tuner!
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Old 01-21-2009, 09:00 AM
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Didn't shred the bottom end, but tore the valvetrain apart. Cam gear ripped out of the camshaft, PTV contact on ALL ehxaust valves, bent six exhaust valves to the point of being stuck open. Number 7 was a little loose in the cylinder upon teardown but that's it.
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Old 01-21-2009, 10:33 AM
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Originally Posted by HP_Addict View Post
ring glands on #5 and #7 got me
Is that anything like a sweat or saliva gland??
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Old 01-21-2009, 11:31 AM
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I'm surprized no one has had a broken rod bolt or main cap even though sometimes it's hard to tell what went first.

Originally Posted by BLOWNBLUEZ06 View Post
Is that anything like a sweat or saliva gland??
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Old 01-21-2009, 09:39 PM
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Originally Posted by 396375 View Post

I'm surprized no one has had a broken rod bolt or main cap even though sometimes it's hard to tell what went first.
I think earlier LS1's had some rod bolt failures until after the C5R effort exposed the weakness...trying to remember but I think there were some rod bolt factory fixes around the 2000 model year. But there has been people on here in the earlier days that experienced rod bolt failures.
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Old 01-21-2009, 09:47 PM
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For me it was the #7 piston ring that went!

I started to have excessive crank pressure/blowby and at times would blow the valve cover gasket out and then finally it blew out the ring

here's a couple of pics:





Thanks,Matt
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Old 01-21-2009, 10:16 PM
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All piston ring lands for me... I'm not kidding.
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Old 01-21-2009, 10:26 PM
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number 1 for me.
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Old 01-22-2009, 05:51 AM
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Breaking the number 7 ring land is indeed the most common. Bob
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Old 01-22-2009, 07:47 PM
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Melted #7 & #5.

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Old 01-23-2009, 12:57 PM
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im workin on it. prob post pics on the site sometime this year
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