[Land-speed] Bad vibes

[Don McMeekin]

Anyone silly enough to cut an engine in half should probably expect  
to encounter some "unusual" problems along the way. During a recent  
dyno pull, our half Windsor (3 liter inline four) sheared off all six  
Locktite secured 7/16" ARP flywheel bolts, and almost welded the  
flywheel to the crank. Seems that we have a harmonic vibration  
problem that has created more force than our system can tolerate.  
So.......... we probably need to strengthen the parts and reduce the  
"bad vibes".

The most obvious action would be to strengthen the parts by  
increasing the bolt diameter, adding some dowels, and making sure  
that everything fits. Reducing the the force could be a little more  
difficult.  The balancer (cheapo fluid type) is clearly not up to the  
task and should to be upgraded to something more in tune with this  
engine's harmonic characteristics.  I really don't have any  
experience in this area and would  greatly appreciate any thoughts  
that list members would care to share.

                  Thanks, Don