New engine "balanced" vibration @ 1500 & 2400 rpm.
#1
New engine "balanced" vibration @ 1500 & 2400 rpm.
So I bought a rotating assembly from a sponsor here and had them balance it a while back. Took my time and Built the motor with checking every clearance by the book with no problems. Now the engine is in the car and has a noticeable vibration at 1500 and 2400 rpm. Other than this it runs perfect. I would imagine that its not clutch related because I was using this same ls7 clutch on my old engine and it was smooth. Could it be this is an internal balance issue? Possibly balanced wrong? I know there really is no way to tell unless I tear it all back down and have the balance checked, but i'm hoping for some insight here.... thoughts?
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#11
I seriously doubt any accessory on the front of the motor is causing this. Plus all the accessories are from my old motor which was running smooth.
#14
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Pressure plate and clutch is always turning. You could simply remove the assembly and replace with a know good stock flywheel/flexplate for starting purposes.
#18
UPDATE! Well I had some clutch issues, so I pulled the trans and replaced the flywheel and clutch with a new unit. After that there was no change in the vibration, it was still there just as before. So tonight I decided to remove the brand new balancer I bought from NAPA that was on this new motor and install my original GM balancer with 200,xxx miles on it (that was known to be good from my old motor) and it is running SMOOTH AS SILK. Brand spankin new balancer from napa was bad. **** luck I suppose, but man am I happy it was just the balancer. Hope this can help others in the future.
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Glad you found out the problem. When I just read it wasn't the clutch I was gonna say pull the front belt AND balancer off and recheck it. But you beat me to it.