Engine “Over Balancing” ?

Any advocates for the process or engine builders that use the process. Please talk to me about why I should think about balancing my 4 cylinder high reving/road engine in this fashion.

 

I was just reading some internet on engine balancing and came across this and had never heard of the technique or process previously.

A quote from The Step-By-Step Guide to Engine Blueprinting
by Rick Voegelin

" High-rpm racing engines are sometimes overbalanced. When an engine is overbalanced, the percentage of the reciprocating weight that makes up the bobweight is increased from the customary 50 percent to about 51 percent or 52 percent. Although there may be some theoretical advantages to overbalancing, the benefits are difficult to discern. Advocates of overbalancing point out that bearing life is increased, while disbelievers maintain that the practice makes no difference in either power or reliability. Overbalancing is one of those engine-building techniques that fall into the gray category labeled “Probably Doesn’t Hurt.” For a street performance engine, using the traditional bobweight formula will provide perfectly
satisfactory results."

 

I belive that the type r crank and flywheel is overbalanced compared to the gsr crank and fly wheel.

 

How are Mean Effective Pressure and Peak Firing Pressure commonly measured in an engine?

 

http://www.maintenanceresources.com/...inebalance.htm

Your answer is half way down the page under the title "History of Balance Equipment and Methodologies"

 

Good info! ^