jasperjacko
Well-Known Member
- Joined
- Dec 4, 2011
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looking good. My engine build is on pause while I fix a house we bought. It has taken twice as much time and money than we planned.
Yup....that's very close to what I'm seeing.By rhythmic vibration, do you mean like 1 second on, one second off type of thing?
Only ask as I chased a vibration like that in my car way back when, with no luck. As a sort of last resort thing, I took the poly trans mount off and replaced it with a new stock rubber one. Vibration gone.
Best I can figure is the normal engine/trans vibration frequency matched the harmonic frequency of the chassis. IIRC, it started around 45 mph and diminished above 70 mph. Drove me almost insane! lol
It's tough to get a dampener weight with the right mass for a given frequency. There's all sorts of calculations based on the vibration hertz, vehicle harmonic frequency, etc....... I had NVH (noise, vibration, harshness) training but that was more than 30 years ago. Used to be good at harmonics, frequencies, how to narrow down the source (engine, trans, tires, resonance.....) but alot of that data is lost. Got overwritten by other data since then.![]()