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engine vibe source? 120-130

posted by  someone claiming to be Erik on  Tue Apr 27 09:07 CST 2004 [RELATED]

Ok, ever since the new engine was installed (b20e overbored to 2.2 with torque cam)there has been a slight vibration at high rpms. The engine was balanced to a half gram by a professional race car engine builder.
Thought it may be from the driveline. When the M41 was installed we had the driveshaft balanced, and all the bearings/bushings/u joints replaced.
still have the vibe. The vibe is enough at high rpms (4,000+) to cause things to become loose, vibrated the starter solenoid screws right out after a spirited cross-state run on the highway.

The engine will be pulled this summer when the body and paint are done and i am wondering where to look next? The only wild card is that the bearings were measured by the guy who overbored the engine (thought he would be better than my inexperienced self). Could slightly off bearings cause a vibration?
Could it also be the cause of the modern (ipd upgrade) rear main seal failure too?
It would be easier to check with the measuring paste while it is on the stand.

Any other areas to look?

expert head scratching greatly appreciated.

-Erik

65 pv 544, 66 220, 66 1800s so many cars so little time.





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