G
Guest
·It's my understanding that 289/302s are completely externally balanced, with the flywheel weights & the harmonic dampener. If this is the case, what would cause this same engine to vibrate at 4000 rpms or so? I've got a 302 engine that, with no tranny connected to it, has a vibration that is progressively worse at higher rpm's. I'm sure that the correct flywheel is on the engine, and the harmonic balancer looks to be in good shape (other than cracks in the rubber or metal, I don't know how to tell if it's good). So, I'm puzzled as to what would make this engine vibrate. Is there an RPM threshold that is going to have vibration regardless - in other words, is it simply a limitation of the engine that anything over 4k is going to be a progressively worse vibration? Or is there something else going on here? For the record, the engine doesn't use any oil and has about 50k on a rebuild. There's no knocking sounds coming from inside.
Visit my repair page for Repair info, with pictures! http://home.dencity.com/mustangcub
Visit my repair page for Repair info, with pictures! http://home.dencity.com/mustangcub