<VV> Harmonic Damper(Not balancer)

[BobHelt at aol.com]

In a message dated 6/13/2011 8:55:39 A.M. US Mountain Standard Time,  
vairologist at cox.net writes:

I have  read (and maybe one of you can tell where the statement came 
from) that  with the Late engine, destructive vibrations were noted as low 
as 
2,700  RPM.  If that is the case, then a cruise speed of 60 MPH is pretty  
close.
 
Never heard of that. It's not in any of the SAE papers, nor any engineering 
 documents that I have ever seen. Please tell us where that info came from.
Regards,
Bob Helt