[tech] Engine Balancing

[jdbubb@ix.netcom.com (Dan Bubb)]

The engine is internally balanced. i.e. the pulleys and flywheel can be
balanced seperately. 
All engines are balanced from the factory, (after all the rotating
components are cast and forged parts that inherently have large
dimensional tolerances) but the tolerance varies depending on the
manufacturer. For instance a Porsche or Ferrari probably has a smaller
allowable difference in weight between components than a VW.
You may of may not notice any difference if you have your engine
balanced to tighter tolerances. Same for the flywheel and pressure plate
unless you plan on having the flywheel lightened which then, of course,
would just about require balancing.
Dan

Benjamin Harder wrote:
> 
> First of all, are VW engines balanced internally from the factory?  Or
> do they also use the crank pulley to help in balancing?  Or is the
> pulley balanced by itself?
> 
> I am looking to rebuild a stock bottom end and will be reassembling
> the engine with original components...just new bearings, rings, etc...
> so, is there any real reason to have the engine re-balanced...is the
> "factory" balance bad enough that I will notice a big difference by
> having a shop balance the engine?  Originally, I thought that I would
> leave the engine alone and just have the PP/Flywheel combo balanced,
> but if the engine is not internally balanced, this would be pointless.
> 
> So, any thoughts?  TIA
> 
> =====
> Benjamin Harder
> 86 Scirocco 16v
> 80 Scirocco
> 93 Passat GLX
> 
> http://www.geocities.com/vwtype53/
> 
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