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Engine connecting rods breaking

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Old Mar 14, 2016 | 04:37 PM
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Default Engine connecting rods breaking
So I've had two engine now that had rod failure on cylinder 5 and 6. But all the rest of the rods are fine. One engine was an lq4 and now and LSX engine. I was wondering if anyone knows why those rods are breaking?
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Old Mar 15, 2016 | 03:17 AM
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They are installed backwards? https://ls1tech.com/forums/generatio...y-install.html
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Old Mar 15, 2016 | 09:23 AM
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Can you provide more info? Like what rods? What application (guessing power adders)? Fuel? Has your machinist/engine builder had a chance to look at it and give their diagnosis?
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Old Mar 17, 2016 | 05:49 PM
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Forged powder metal rods, 91 octane, turbocharged and they were crate engines. All the other rods are perfectly fine. Not bent or heated.
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Old Mar 17, 2016 | 06:23 PM
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Pictures? What happened to the pistons?
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Old Mar 17, 2016 | 06:35 PM
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Old Mar 17, 2016 | 06:35 PM
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Pistons and heads are fine. No stamped valves or anything. Rods just snapped.
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Old Mar 17, 2016 | 08:32 PM
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How much boost, power and RPM were you running.

Sounds like you need some better rods, dunno why you went with the stock ones yet again after snapping the first set. They are good rods, but they still have limitations especially with boost.
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Old Mar 17, 2016 | 08:39 PM
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It was a crate engine with warranty or I would have changed rods. And we had t red lined 400 rpm below max recommended. Just dunno why those two went but the others show no sign of stress
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Old Mar 17, 2016 | 09:00 PM
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Oiling issues

Tim
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Old Mar 17, 2016 | 09:22 PM
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Bearings have no scores or heat marks tho? And no signs of wear?
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Old Mar 18, 2016 | 09:49 AM
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sounds like you don't want to accept that you're just overpowering them.
since you're keeping the details to a minimum, unless you're trying to warranty this one too
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Old Mar 18, 2016 | 09:56 AM
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Boost was set at 12ls made 621 rwhp. But Chevrolet performance is warranting it. Thanks though guys.
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Old Mar 18, 2016 | 10:46 AM
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Boost was set at 12ls made 621 rwhp. But Chevrolet performance is warranting it. Thanks though guys.
So you're going to pull the engine apart and send in the rods for warranty every month now?

Great that they're taking care of you, but clearly you need some better rods unless you like tearing into your engine and sitting around while GMPP sends you a new set then doing it all over again next month.
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Old Mar 18, 2016 | 10:51 AM
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Yeah I believe I'm gonna change the rods this time around and upgrade to Callie's. It'll void the warranty but at least my engine will last
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