Vibration at 3500 RPM - Please Help
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Teching In
Joined: Mar 2002
Posts: 39
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From: Minneapolis
Vibration at 3500 RPM - Please Help I had a new LS6 engine built last September by a Corvette race car driver who competes in the World Challenge GT. My corvette is an automatic. There is a vibration at 3500 RPM in all gears, including when the car is revved in nuetral. This suggests that there's an issue with the engine. I am assuming that the LS6 short block was balanced at the factory yet maybe not. The heads are AFR 205 and cam is the G5-x3. Can anyone tell me how serious this condition may be? What might be a possible fix? I am hoping the builder will provide some warranty to fix the problem. What could happen to the engine if the vibration/harmonic is not corrected?
I appreciate everyone's input.
Paul
I appreciate everyone's input.
Paul
On The Tree
Joined: Sep 2004
Posts: 143
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From: St. Clair
Something else to consider, seeing that you are an auto...It may be possible that the vibration is coming from an imbalance in the torque converter...Also, take a look at all the accessory (power steering pump, a/c, etc) brackets and make sure that something is not loose or cracked...
Vibrations that occur at a certain rpm are, as you say, usually harmonic related...I would think that an imbalance in the engine would show up more as a roughness, than a vibration...
Also, make sure that the harmonic balancer has not loosened itself up...That thing is supposed to have the nut torqued to 350ft-lbs or something like that...
I am running a G5X3 and the only vibration, so to speak, is just a lumpy idle...Other than that, the engine is a smooth as silk...
Good Luck...
Peace...Gman
Vibrations that occur at a certain rpm are, as you say, usually harmonic related...I would think that an imbalance in the engine would show up more as a roughness, than a vibration...
Also, make sure that the harmonic balancer has not loosened itself up...That thing is supposed to have the nut torqued to 350ft-lbs or something like that...
I am running a G5X3 and the only vibration, so to speak, is just a lumpy idle...Other than that, the engine is a smooth as silk...
Good Luck...
Peace...Gman
