new motor, spun bearing
04-03-2008, 05:29 PM
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new motor, spun bearing on one of my rebullt forged motors, Im kind of curious on what caused it to spin a rod bearing. It had a new ls6 oil pump and plenty of oil pressure. It started knocking after about 90 miles.
04-03-2008, 06:08 PM
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why did you rebuild it in the first place cause if you had a spun bearing before and you just replaced the bearings thats wrong cause with a forged motor when you spin a bearing you need to replace the crank bearings and the rod that it spun on cause it makes a black mark in the rod and you cna no longer use it thats what happened to me
04-03-2008, 06:27 PM
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, old motor popped with boost and a poor tune with the STS turbo.
the new motor have new everything and a re finished crank, new H beam rods,bearings, billet main caps, you name it.
the new motor have new everything and a re finished crank, new H beam rods,bearings, billet main caps, you name it.
04-03-2008, 06:40 PM
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Running too rich-washed it out.
Spinning it too hard.
Low on oil.
Wasnt put together right.
Wasnt clean when rebuilt.
Anything really, but probably one of those I listed.
Spinning it too hard.
Low on oil.
Wasnt put together right.
Wasnt clean when rebuilt.
Anything really, but probably one of those I listed.
04-03-2008, 08:39 PM
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3 things kill bearings in new engines
1-the biggest DIRT-usually comes from metal shaving left in the oil galleys,seen this happen way too many times
2-improper oil clearance on the bearings
3-detonation-improper tune
1-the biggest DIRT-usually comes from metal shaving left in the oil galleys,seen this happen way too many times
2-improper oil clearance on the bearings
3-detonation-improper tune
04-03-2008, 11:14 PM
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04-04-2008, 02:26 PM
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I didnt build the motor, so Im not sure on how close the tolerances were on that forged motor.
No detonation, i was just breaking it in and never put the turbo back on.
Oil pressure was fine and never dropped below 22 once warm.
I never took it over 6k rpms.
I was actually surprised when I first heard it knock.
No detonation, i was just breaking it in and never put the turbo back on.
Oil pressure was fine and never dropped below 22 once warm.
I never took it over 6k rpms.
I was actually surprised when I first heard it knock.
